[scheduler] Blink-style enum names in scheduler

R=haraken@chromium.org

Change-Id: Ia88e4aefd42f295a0768dd9ae68e6b2f822d84ed
Reviewed-on: https://chromium-review.googlesource.com/766794
Commit-Queue: Alexander Timin <altimin@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516302}
diff --git a/third_party/WebKit/Source/core/inspector/InspectorEmulationAgent.cpp b/third_party/WebKit/Source/core/inspector/InspectorEmulationAgent.cpp
index ce35c71..d5e56ea 100644
--- a/third_party/WebKit/Source/core/inspector/InspectorEmulationAgent.cpp
+++ b/third_party/WebKit/Source/core/inspector/InspectorEmulationAgent.cpp
@@ -142,14 +142,14 @@
     protocol::Maybe<int> max_virtual_time_task_starvation_count) {
   if (protocol::Emulation::VirtualTimePolicyEnum::Advance == policy) {
     web_local_frame_->View()->Scheduler()->SetVirtualTimePolicy(
-        WebViewScheduler::VirtualTimePolicy::ADVANCE);
+        WebViewScheduler::VirtualTimePolicy::kAdvance);
   } else if (protocol::Emulation::VirtualTimePolicyEnum::Pause == policy) {
     web_local_frame_->View()->Scheduler()->SetVirtualTimePolicy(
-        WebViewScheduler::VirtualTimePolicy::PAUSE);
+        WebViewScheduler::VirtualTimePolicy::kPause);
   } else if (protocol::Emulation::VirtualTimePolicyEnum::
                  PauseIfNetworkFetchesPending == policy) {
     web_local_frame_->View()->Scheduler()->SetVirtualTimePolicy(
-        WebViewScheduler::VirtualTimePolicy::DETERMINISTIC_LOADING);
+        WebViewScheduler::VirtualTimePolicy::kDeterministicLoading);
   }
   web_local_frame_->View()->Scheduler()->EnableVirtualTime();
   if (!virtual_time_observer_registered_) {
@@ -182,7 +182,7 @@
 
 void InspectorEmulationAgent::VirtualTimeBudgetExpired() {
   web_local_frame_->View()->Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::PAUSE);
+      WebViewScheduler::VirtualTimePolicy::kPause);
   GetFrontend()->virtualTimeBudgetExpired();
 }
 
diff --git a/third_party/WebKit/Source/core/layout/ScrollbarsTest.cpp b/third_party/WebKit/Source/core/layout/ScrollbarsTest.cpp
index 3ad2331..f48ef85 100644
--- a/third_party/WebKit/Source/core/layout/ScrollbarsTest.cpp
+++ b/third_party/WebKit/Source/core/layout/ScrollbarsTest.cpp
@@ -106,12 +106,12 @@
 
   void TimeAdvance() {
     WebView().Scheduler()->SetVirtualTimePolicy(
-        WebViewScheduler::VirtualTimePolicy::ADVANCE);
+        WebViewScheduler::VirtualTimePolicy::kAdvance);
   }
 
   void StopVirtualTimeAndExitRunLoop() {
     WebView().Scheduler()->SetVirtualTimePolicy(
-        WebViewScheduler::VirtualTimePolicy::PAUSE);
+        WebViewScheduler::VirtualTimePolicy::kPause);
     testing::ExitRunLoop();
   }
 
diff --git a/third_party/WebKit/Source/core/scheduler/VirtualTimeTest.cpp b/third_party/WebKit/Source/core/scheduler/VirtualTimeTest.cpp
index 7e6f4982..78444618 100644
--- a/third_party/WebKit/Source/core/scheduler/VirtualTimeTest.cpp
+++ b/third_party/WebKit/Source/core/scheduler/VirtualTimeTest.cpp
@@ -53,7 +53,7 @@
 
   void StopVirtualTimeAndExitRunLoop() {
     WebView().Scheduler()->SetVirtualTimePolicy(
-        WebViewScheduler::VirtualTimePolicy::PAUSE);
+        WebViewScheduler::VirtualTimePolicy::kPause);
     testing::ExitRunLoop();
   }
 
@@ -82,7 +82,7 @@
 TEST_F(VirtualTimeTest, MAYBE_DOMTimersFireInExpectedOrder) {
   WebView().Scheduler()->EnableVirtualTime();
   WebView().Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::ADVANCE);
+      WebViewScheduler::VirtualTimePolicy::kAdvance);
 
   ExecuteJavaScript(
       "var run_order = [];"
@@ -111,7 +111,7 @@
 TEST_F(VirtualTimeTest, MAYBE_SetInterval) {
   WebView().Scheduler()->EnableVirtualTime();
   WebView().Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::ADVANCE);
+      WebViewScheduler::VirtualTimePolicy::kAdvance);
 
   ExecuteJavaScript(
       "var run_order = [];"
@@ -139,7 +139,7 @@
 TEST_F(VirtualTimeTest, MAYBE_AllowVirtualTimeToAdvance) {
   WebView().Scheduler()->EnableVirtualTime();
   WebView().Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::PAUSE);
+      WebViewScheduler::VirtualTimePolicy::kPause);
 
   ExecuteJavaScript(
       "var run_order = [];"
@@ -154,7 +154,7 @@
   EXPECT_EQ("", ExecuteJavaScript("run_order.join(', ')"));
 
   WebView().Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::ADVANCE);
+      WebViewScheduler::VirtualTimePolicy::kAdvance);
   RunTasksForPeriod(1000);
 
   EXPECT_EQ("c, b, a", ExecuteJavaScript("run_order.join(', ')"));
@@ -172,7 +172,7 @@
        MAYBE_VirtualTimeNotAllowedToAdvanceWhileResourcesLoading) {
   WebView().Scheduler()->EnableVirtualTime();
   WebView().Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::DETERMINISTIC_LOADING);
+      WebViewScheduler::VirtualTimePolicy::kDeterministicLoading);
 
   EXPECT_TRUE(WebView().Scheduler()->VirtualTimeAllowedToAdvance());
 
@@ -216,7 +216,7 @@
 TEST_F(VirtualTimeTest, MAYBE_DOMTimersSuspended) {
   WebView().Scheduler()->EnableVirtualTime();
   WebView().Scheduler()->SetVirtualTimePolicy(
-      WebViewScheduler::VirtualTimePolicy::ADVANCE);
+      WebViewScheduler::VirtualTimePolicy::kAdvance);
 
   // Schedule normal DOM timers to run at 1s and 1.001s in the future.
   ExecuteJavaScript(
@@ -228,14 +228,15 @@
       Window().GetExecutionContext()->GetTaskRunner(TaskType::kJavascriptTimer);
 
   // Schedule a task to suspend virtual time at the same point in time.
-  runner->PostDelayedTask(BLINK_FROM_HERE,
-                          WTF::Bind(
-                              [](WebViewScheduler* scheduler) {
-                                scheduler->SetVirtualTimePolicy(
-                                    WebViewScheduler::VirtualTimePolicy::PAUSE);
-                              },
-                              WTF::Unretained(WebView().Scheduler())),
-                          TimeDelta::FromMilliseconds(1000));
+  runner->PostDelayedTask(
+      BLINK_FROM_HERE,
+      WTF::Bind(
+          [](WebViewScheduler* scheduler) {
+            scheduler->SetVirtualTimePolicy(
+                WebViewScheduler::VirtualTimePolicy::kPause);
+          },
+          WTF::Unretained(WebView().Scheduler())),
+      TimeDelta::FromMilliseconds(1000));
 
   // ALso schedule a third timer for the same point in time.
   ExecuteJavaScript("setTimeout(() => { run_order.push(2); }, 1000);");
diff --git a/third_party/WebKit/Source/platform/TimerTest.cpp b/third_party/WebKit/Source/platform/TimerTest.cpp
index 8929aea0..70182cb 100644
--- a/third_party/WebKit/Source/platform/TimerTest.cpp
+++ b/third_party/WebKit/Source/platform/TimerTest.cpp
@@ -539,7 +539,7 @@
 TEST_F(TimerTest, UserSuppliedWebTaskRunner) {
   scoped_refptr<scheduler::TaskQueue> task_runner(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner =
       scheduler::WebTaskRunnerImpl::Create(task_runner);
   TimerForTest<TimerTest> timer(web_task_runner, this,
@@ -630,7 +630,7 @@
 
   scoped_refptr<scheduler::TaskQueue> task_runner1(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner1 =
       scheduler::WebTaskRunnerImpl::Create(task_runner1);
   TaskObserver task_observer1(web_task_runner1, &run_order);
@@ -638,7 +638,7 @@
 
   scoped_refptr<scheduler::TaskQueue> task_runner2(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner2 =
       scheduler::WebTaskRunnerImpl::Create(task_runner2);
   TaskObserver task_observer2(web_task_runner2, &run_order);
@@ -670,7 +670,7 @@
 
   scoped_refptr<scheduler::TaskQueue> task_runner1(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner1 =
       scheduler::WebTaskRunnerImpl::Create(task_runner1);
   TaskObserver task_observer1(web_task_runner1, &run_order);
@@ -678,7 +678,7 @@
 
   scoped_refptr<scheduler::TaskQueue> task_runner2(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner2 =
       scheduler::WebTaskRunnerImpl::Create(task_runner2);
   TaskObserver task_observer2(web_task_runner2, &run_order);
@@ -712,13 +712,13 @@
 TEST_F(TimerTest, MoveToNewTaskRunnerWithoutTasks) {
   scoped_refptr<scheduler::TaskQueue> task_runner1(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner1 =
       scheduler::WebTaskRunnerImpl::Create(task_runner1);
 
   scoped_refptr<scheduler::TaskQueue> task_runner2(
       platform_->GetRendererScheduler()->NewTimerTaskQueue(
-          scheduler::MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE));
+          scheduler::MainThreadTaskQueue::QueueType::kFrameThrottleable));
   scoped_refptr<scheduler::WebTaskRunnerImpl> web_task_runner2 =
       scheduler::WebTaskRunnerImpl::Create(task_runner2);
 
diff --git a/third_party/WebKit/Source/platform/scheduler/README.md b/third_party/WebKit/Source/platform/scheduler/README.md
index 45b4e67..4c050c2 100644
--- a/third_party/WebKit/Source/platform/scheduler/README.md
+++ b/third_party/WebKit/Source/platform/scheduler/README.md
@@ -29,7 +29,7 @@
 ## 2016
 
 * [Time-based renderer task throttling](https://drive.google.com/open?id=1vCUeGfr2xzZ67SFt2yZjNeaIcXGp2Td6KHN7bI02ySo)
-* [V8 Performance Mode](https://drive.google.com/open?id=1bRVAP08qNBvnEm_vO4hW1-NqQC9-lQZjUH29_vwfYRY)
+* [kV8 Performance Mode](https://drive.google.com/open?id=1bRVAP08qNBvnEm_vO4hW1-NqQC9-lQZjUH29_vwfYRY)
 * [Isolating performance of third-party iframes](https://docs.google.com/document/d/1CEggurHQGXenhu_GQT7KnRvtSuowuenXpxVzYSeRxSY/edit)
 * [Folly of Scheduling (BlinkOn 6)](https://drive.google.com/open?id=1ZMxbnSn1R1o2-NGztP0mVyOOoQg24bLSqWE1SWXnQ_E)
 * [Rendering pipeline throttling (BlinkOn 6)](https://docs.google.com/presentation/d/1aPZzH7J0O29sqA_FzsuWQNDwK6CoNcAcpMvJexsO6Vg/edit)
diff --git a/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.cc b/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.cc
index fcfd3ffd..f2570877 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.cc
@@ -11,7 +11,7 @@
 // Note we set the first |enqueue_order_| to a specific non-zero value, because
 // first N values of EnqueueOrder have special meaning (see EnqueueOrderValues).
 EnqueueOrderGenerator::EnqueueOrderGenerator()
-    : enqueue_order_(static_cast<EnqueueOrder>(EnqueueOrderValues::FIRST)) {}
+    : enqueue_order_(static_cast<EnqueueOrder>(EnqueueOrderValues::kFirst)) {}
 
 EnqueueOrderGenerator::~EnqueueOrderGenerator() {}
 
diff --git a/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.h b/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.h
index 04932d5..05c47d4 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/enqueue_order.h
@@ -18,11 +18,11 @@
 // TODO(scheduler-dev): Remove explicit casts when c++17 comes.
 enum class EnqueueOrderValues : EnqueueOrder {
   // Invalid EnqueueOrder.
-  NONE = 0,
+  kNone = 0,
 
   // Earliest possible EnqueueOrder, to be used for fence blocking.
-  BLOCKING_FENCE = 1,
-  FIRST = 2,
+  kBlockingFence = 1,
+  kFirst = 2,
 };
 
 // A 64bit integer used to provide ordering of tasks. NOTE The scheduler assumes
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue.cc
index 53f1541..34db6e13 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue.cc
@@ -146,7 +146,7 @@
 TaskQueue::QueuePriority TaskQueue::GetQueuePriority() const {
   DCHECK_CALLED_ON_VALID_THREAD(main_thread_checker_);
   if (!impl_)
-    return TaskQueue::QueuePriority::LOW_PRIORITY;
+    return TaskQueue::QueuePriority::kLowPriority;
   return impl_->GetQueuePriority();
 }
 
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue.h
index 59bd7b3..9dc954a 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue.h
@@ -78,23 +78,23 @@
     // Queues with control priority will run before any other queue, and will
     // explicitly starve other queues. Typically this should only be used for
     // private queues which perform control operations.
-    CONTROL_PRIORITY,
+    kControlPriority,
 
     // The selector will prioritize high over normal and low and normal over
     // low. However it will ensure neither of the lower priority queues can be
     // completely starved by higher priority tasks. All three of these queues
     // will always take priority over and can starve the best effort queue.
-    HIGH_PRIORITY,
+    kHighPriority,
     // Queues with normal priority are the default.
-    NORMAL_PRIORITY,
-    LOW_PRIORITY,
+    kNormalPriority,
+    kLowPriority,
 
     // Queues with best effort priority will only be run if all other queues are
     // empty. They can be starved by the other queues.
-    BEST_EFFORT_PRIORITY,
+    kBestEffortPriority,
     // Must be the last entry.
-    QUEUE_PRIORITY_COUNT,
-    FIRST_QUEUE_PRIORITY = CONTROL_PRIORITY,
+    kQueuePriorityCount,
+    kFirstQueuePriority = kControlPriority,
   };
 
   // Can be called on any thread.
@@ -219,9 +219,9 @@
   TimeDomain* GetTimeDomain() const;
 
   enum class InsertFencePosition {
-    NOW,  // Tasks posted on the queue up till this point further may run.
-          // All further tasks are blocked.
-    BEGINNING_OF_TIME,  // No tasks posted on this queue may run.
+    kNow,  // Tasks posted on the queue up till this point further may run.
+           // All further tasks are blocked.
+    kBeginningOfTime,  // No tasks posted on this queue may run.
   };
 
   // Inserts a barrier into the task queue which prevents tasks with an enqueue
@@ -233,7 +233,7 @@
   // Fences come in three flavours:
   // - Regular (InsertFence(NOW)) - all tasks posted after this moment
   //   are blocked.
-  // - Fully blocking (InsertFence(BEGINNING_OF_TIME)) - all tasks including
+  // - Fully blocking (InsertFence(kBeginningOfTime)) - all tasks including
   //   already posted are blocked.
   // - Delayed (InsertFenceAt(timestamp)) - blocks all tasks posted after given
   //   point in time (must be in the future).
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
index 44395f6..49c3fd5 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_impl.cc
@@ -22,15 +22,15 @@
 // static
 const char* TaskQueue::PriorityToString(TaskQueue::QueuePriority priority) {
   switch (priority) {
-    case CONTROL_PRIORITY:
+    case kControlPriority:
       return "control";
-    case HIGH_PRIORITY:
+    case kHighPriority:
       return "high";
-    case NORMAL_PRIORITY:
+    case kNormalPriority:
       return "normal";
-    case LOW_PRIORITY:
+    case kLowPriority:
       return "low";
-    case BEST_EFFORT_PRIORITY:
+    case kBestEffortPriority:
       return "best_effort";
     default:
       NOTREACHED();
@@ -102,10 +102,10 @@
     : task_queue_manager(task_queue_manager),
       time_domain(time_domain),
       delayed_work_queue(
-          new WorkQueue(task_queue, "delayed", WorkQueue::QueueType::DELAYED)),
+          new WorkQueue(task_queue, "delayed", WorkQueue::QueueType::kDelayed)),
       immediate_work_queue(new WorkQueue(task_queue,
                                          "immediate",
-                                         WorkQueue::QueueType::IMMEDIATE)),
+                                         WorkQueue::QueueType::kImmediate)),
       set_index(0),
       is_enabled_refcount(0),
       voter_refcount(0),
@@ -319,7 +319,7 @@
       if (task.delayed_run_time >= main_thread_only().delayed_fence.value()) {
         main_thread_only().delayed_fence = base::nullopt;
         DCHECK_EQ(main_thread_only().current_fence,
-                  static_cast<EnqueueOrder>(EnqueueOrderValues::NONE));
+                  static_cast<EnqueueOrder>(EnqueueOrderValues::kNone));
         bool task_unblocked = InsertFenceImpl(task.enqueue_order());
         DCHECK(!task_unblocked)
             << "Activating a delayed fence shouldn't unblock new work";
@@ -576,9 +576,9 @@
 
   EnqueueOrder previous_fence = main_thread_only().current_fence;
   EnqueueOrder current_fence =
-      position == TaskQueue::InsertFencePosition::NOW
+      position == TaskQueue::InsertFencePosition::kNow
           ? main_thread_only().task_queue_manager->GetNextSequenceNumber()
-          : static_cast<EnqueueOrder>(EnqueueOrderValues::BLOCKING_FENCE);
+          : static_cast<EnqueueOrder>(EnqueueOrderValues::kBlockingFence);
 
   // Tasks posted after this point will have a strictly higher enqueue order
   // and will be blocked from running.
@@ -960,7 +960,7 @@
     return;
   if (main_thread_only().delayed_fence.value() > now)
     return;
-  InsertFence(TaskQueue::InsertFencePosition::NOW);
+  InsertFence(TaskQueue::InsertFencePosition::kNow);
   main_thread_only().delayed_fence = base::nullopt;
 }
 
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
index 6e1cb435..b6a702f4 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.cc
@@ -322,12 +322,12 @@
     base::TimeTicks time_after_task;
     switch (ProcessTaskFromWorkQueue(work_queue, is_nested, lazy_now,
                                      &time_after_task)) {
-      case ProcessTaskResult::DEFERRED:
+      case ProcessTaskResult::kDeferred:
         // If a task was deferred, try again with another task.
         continue;
-      case ProcessTaskResult::EXECUTED:
+      case ProcessTaskResult::kExecuted:
         break;
-      case ProcessTaskResult::TASK_QUEUE_MANAGER_DELETED:
+      case ProcessTaskResult::kTaskQueueManagerDeleted:
         return;  // The TaskQueueManager got deleted, we must bail out.
     }
 
@@ -484,7 +484,7 @@
 
   // It's possible the task was canceled, if so bail out.
   if (pending_task.task.IsCancelled())
-    return ProcessTaskResult::EXECUTED;
+    return ProcessTaskResult::kExecuted;
 
   internal::TaskQueueImpl* queue = work_queue->task_queue();
   if (queue->GetQuiescenceMonitored())
@@ -500,7 +500,7 @@
     delegate_->PostNonNestableTask(
         pending_task.posted_from,
         UnsafeConvertOnceClosureToRepeating(std::move(pending_task.task)));
-    return ProcessTaskResult::DEFERRED;
+    return ProcessTaskResult::kDeferred;
   }
 
   double task_start_time_sec = 0;
@@ -536,7 +536,7 @@
   // Detect if the TaskQueueManager just got deleted.  If this happens we must
   // not access any member variables after this point.
   if (!protect)
-    return ProcessTaskResult::TASK_QUEUE_MANAGER_DELETED;
+    return ProcessTaskResult::kTaskQueueManagerDeleted;
 
   currently_executing_task_queue_ = prev_executing_task_queue;
 
@@ -564,7 +564,7 @@
                          "duration", task_end_time_sec - task_start_time_sec);
   }
 
-  return ProcessTaskResult::EXECUTED;
+  return ProcessTaskResult::kExecuted;
 }
 
 bool TaskQueueManager::RunsTasksInCurrentSequence() const {
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
index 3aca257..95288ab 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager.h
@@ -274,9 +274,9 @@
   bool SelectWorkQueueToService(internal::WorkQueue** out_work_queue);
 
   enum class ProcessTaskResult {
-    DEFERRED,
-    EXECUTED,
-    TASK_QUEUE_MANAGER_DELETED
+    kDeferred,
+    kExecuted,
+    kTaskQueueManagerDeleted,
   };
 
   // Runs a single nestable task from the |queue|. On exit, |out_task| will
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager_unittest.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager_unittest.cc
index c7a7bd0..b6aca87 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_manager_unittest.cc
@@ -563,7 +563,7 @@
 
 TEST_F(TaskQueueManagerTest, InsertAndRemoveFence) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   std::vector<EnqueueOrder> run_order;
   // Posting a task when pumping is disabled doesn't result in work getting
@@ -588,7 +588,7 @@
   std::unique_ptr<TaskQueue::QueueEnabledVoter> voter =
       runners_[0]->CreateQueueEnabledVoter();
   voter->SetQueueEnabled(false);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 1, &run_order));
 
   runners_[0]->RemoveFence();
@@ -602,7 +602,7 @@
   std::unique_ptr<TaskQueue::QueueEnabledVoter> voter =
       runners_[0]->CreateQueueEnabledVoter();
   voter->SetQueueEnabled(false);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 1, &run_order));
 
   voter->SetQueueEnabled(true);
@@ -649,7 +649,7 @@
   Initialize(1u);
 
   std::vector<EnqueueOrder> run_order;
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   std::unique_ptr<TaskQueue::QueueEnabledVoter> voter =
       runners_[0]->CreateQueueEnabledVoter();
   voter->SetQueueEnabled(false);
@@ -666,7 +666,7 @@
 
 TEST_F(TaskQueueManagerTest, RemovingFenceWithDelayedTask) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   std::vector<EnqueueOrder> run_order;
   // Posting a delayed task when fenced will apply the delay, but won't cause
@@ -688,7 +688,7 @@
 
 TEST_F(TaskQueueManagerTest, RemovingFenceWithMultipleDelayedTasks) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   std::vector<EnqueueOrder> run_order;
   // Posting a delayed task when fenced will apply the delay, but won't cause
@@ -715,7 +715,7 @@
 
 TEST_F(TaskQueueManagerTest, InsertFencePreventsDelayedTasksFromRunning) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   std::vector<EnqueueOrder> run_order;
   base::TimeDelta delay(base::TimeDelta::FromMilliseconds(10));
@@ -732,13 +732,13 @@
   std::vector<EnqueueOrder> run_order;
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 1, &run_order));
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 2, &run_order));
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 3, &run_order));
   test_task_runner_->RunUntilIdle();
   EXPECT_THAT(run_order, ElementsAre(1, 2));
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   // Subsequent tasks should be blocked.
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 4, &run_order));
   test_task_runner_->RunUntilIdle();
@@ -747,7 +747,7 @@
 
 TEST_F(TaskQueueManagerTest, InsertFenceThenImmediatlyRemoveDoesNotBlock) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   runners_[0]->RemoveFence();
 
   std::vector<EnqueueOrder> run_order;
@@ -760,7 +760,7 @@
 
 TEST_F(TaskQueueManagerTest, InsertFencePostThenRemoveDoesNotBlock) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   std::vector<EnqueueOrder> run_order;
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 1, &run_order));
@@ -773,11 +773,11 @@
 
 TEST_F(TaskQueueManagerTest, MultipleFencesWithInitiallyEmptyQueue) {
   Initialize(1u);
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   std::vector<EnqueueOrder> run_order;
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 1, &run_order));
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   runners_[0]->PostTask(FROM_HERE, base::Bind(&TestTask, 2, &run_order));
   test_task_runner_->RunUntilIdle();
   EXPECT_THAT(run_order, ElementsAre(1));
@@ -787,14 +787,14 @@
   Initialize(1u);
   EXPECT_FALSE(runners_[0]->BlockedByFence());
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   EXPECT_TRUE(runners_[0]->BlockedByFence());
 
   runners_[0]->RemoveFence();
   EXPECT_FALSE(runners_[0]->BlockedByFence());
 
   runners_[0]->PostTask(FROM_HERE, base::Bind(&NopTask));
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   EXPECT_FALSE(runners_[0]->BlockedByFence());
 
   test_task_runner_->RunUntilIdle();
@@ -809,10 +809,10 @@
 
   runners_[0]->PostTask(FROM_HERE, base::Bind(&NopTask));
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   EXPECT_FALSE(runners_[0]->BlockedByFence());
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
   EXPECT_TRUE(runners_[0]->BlockedByFence());
 }
 
@@ -2665,7 +2665,7 @@
 TEST_F(TaskQueueManagerTest, ComputeDelayTillNextTask_Fence) {
   Initialize(1u);
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   runners_[0]->PostTask(FROM_HERE, base::Bind(&NopTask));
 
   LazyNow lazy_now(now_src_.get());
@@ -2675,9 +2675,9 @@
 TEST_F(TaskQueueManagerTest, ComputeDelayTillNextTask_FenceUnblocking) {
   Initialize(1u);
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   runners_[0]->PostTask(FROM_HERE, base::Bind(&NopTask));
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   LazyNow lazy_now(now_src_.get());
   EXPECT_EQ(base::TimeDelta(), ComputeDelayTillNextTask(&lazy_now)->Delay());
@@ -2898,10 +2898,10 @@
   EnqueueOrder enqueue_order = GetNextSequenceNumber();
   EXPECT_TRUE(runners_[0]->GetTaskQueueImpl()->CouldTaskRun(enqueue_order));
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   EXPECT_TRUE(runners_[0]->GetTaskQueueImpl()->CouldTaskRun(enqueue_order));
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
   EXPECT_FALSE(runners_[0]->GetTaskQueueImpl()->CouldTaskRun(enqueue_order));
 
   runners_[0]->RemoveFence();
@@ -2911,12 +2911,12 @@
 TEST_F(TaskQueueManagerTest, CouldTaskRun_FenceBeforeThenAfter) {
   Initialize(1u);
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   EnqueueOrder enqueue_order = GetNextSequenceNumber();
   EXPECT_FALSE(runners_[0]->GetTaskQueueImpl()->CouldTaskRun(enqueue_order));
 
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kNow);
   EXPECT_TRUE(runners_[0]->GetTaskQueueImpl()->CouldTaskRun(enqueue_order));
 }
 
@@ -3009,7 +3009,7 @@
   EXPECT_EQ(start_time + delay2, runners_[0]->GetNextScheduledWakeUp());
 
   // Neither should fences.
-  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
+  runners_[0]->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
   EXPECT_EQ(start_time + delay2, runners_[0]->GetNextScheduledWakeUp());
 }
 
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector.cc
index 4afaf35..6692854 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector.cc
@@ -27,7 +27,7 @@
 void TaskQueueSelector::AddQueue(internal::TaskQueueImpl* queue) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   DCHECK(queue->IsQueueEnabled());
-  enabled_selector_.AddQueue(queue, TaskQueue::NORMAL_PRIORITY);
+  enabled_selector_.AddQueue(queue, TaskQueue::kNormalPriority);
 }
 
 void TaskQueueSelector::RemoveQueue(internal::TaskQueueImpl* queue) {
@@ -74,7 +74,7 @@
 
 void TaskQueueSelector::SetQueuePriority(internal::TaskQueueImpl* queue,
                                          TaskQueue::QueuePriority priority) {
-  DCHECK_LT(priority, TaskQueue::QUEUE_PRIORITY_COUNT);
+  DCHECK_LT(priority, TaskQueue::kQueuePriorityCount);
   DCHECK(main_thread_checker_.CalledOnValidThread());
   if (queue->IsQueueEnabled()) {
     enabled_selector_.ChangeSetIndex(queue, priority);
@@ -92,7 +92,7 @@
 
 TaskQueue::QueuePriority TaskQueueSelector::NextPriority(
     TaskQueue::QueuePriority priority) {
-  DCHECK(priority < TaskQueue::QUEUE_PRIORITY_COUNT);
+  DCHECK(priority < TaskQueue::kQueuePriorityCount);
   return static_cast<TaskQueue::QueuePriority>(static_cast<int>(priority) + 1);
 }
 
@@ -100,8 +100,8 @@
     TaskQueueSelector* task_queue_selector,
     const char* name)
     : task_queue_selector_(task_queue_selector),
-      delayed_work_queue_sets_(TaskQueue::QUEUE_PRIORITY_COUNT, name),
-      immediate_work_queue_sets_(TaskQueue::QUEUE_PRIORITY_COUNT, name) {}
+      delayed_work_queue_sets_(TaskQueue::kQueuePriorityCount, name),
+      immediate_work_queue_sets_(TaskQueue::kQueuePriorityCount, name) {}
 
 void TaskQueueSelector::PrioritizingSelector::AddQueue(
     internal::TaskQueueImpl* queue,
@@ -208,33 +208,33 @@
   DCHECK_EQ(*out_chose_delayed_over_immediate, false);
 
   // Always service the control queue if it has any work.
-  if (max_priority > TaskQueue::CONTROL_PRIORITY &&
-      ChooseOldestWithPriority(TaskQueue::CONTROL_PRIORITY,
+  if (max_priority > TaskQueue::kControlPriority &&
+      ChooseOldestWithPriority(TaskQueue::kControlPriority,
                                out_chose_delayed_over_immediate,
                                out_work_queue)) {
     return true;
   }
 
   // Select from the low priority queue if we are starving it.
-  if (max_priority > TaskQueue::LOW_PRIORITY &&
+  if (max_priority > TaskQueue::kLowPriority &&
       task_queue_selector_->low_priority_starvation_score_ >=
           kMaxLowPriorityStarvationScore &&
-      ChooseOldestWithPriority(TaskQueue::LOW_PRIORITY,
+      ChooseOldestWithPriority(TaskQueue::kLowPriority,
                                out_chose_delayed_over_immediate,
                                out_work_queue)) {
     return true;
   }
   // Select from the normal priority queue if we are starving it.
-  if (max_priority > TaskQueue::NORMAL_PRIORITY &&
+  if (max_priority > TaskQueue::kNormalPriority &&
       task_queue_selector_->normal_priority_starvation_score_ >=
           kMaxNormalPriorityStarvationScore &&
-      ChooseOldestWithPriority(TaskQueue::NORMAL_PRIORITY,
+      ChooseOldestWithPriority(TaskQueue::kNormalPriority,
                                out_chose_delayed_over_immediate,
                                out_work_queue)) {
     return true;
   }
   // Otherwise choose in priority order.
-  for (TaskQueue::QueuePriority priority = TaskQueue::HIGH_PRIORITY;
+  for (TaskQueue::QueuePriority priority = TaskQueue::kHighPriority;
        priority < max_priority; priority = NextPriority(priority)) {
     if (ChooseOldestWithPriority(priority, out_chose_delayed_over_immediate,
                                  out_work_queue)) {
@@ -264,7 +264,7 @@
   DCHECK(main_thread_checker_.CalledOnValidThread());
   bool chose_delayed_over_immediate = false;
   bool found_queue = enabled_selector_.SelectWorkQueueToService(
-      TaskQueue::QUEUE_PRIORITY_COUNT, out_work_queue,
+      TaskQueue::kQueuePriorityCount, out_work_queue,
       &chose_delayed_over_immediate);
   if (!found_queue) {
     TrySelectingBlockedQueue();
@@ -287,7 +287,7 @@
   // There was nothing unblocked to run, see if we could have run a blocked
   // task.
   if (blocked_selector_.SelectWorkQueueToService(
-          TaskQueue::QUEUE_PRIORITY_COUNT, &chosen_blocked_queue,
+          TaskQueue::kQueuePriorityCount, &chosen_blocked_queue,
           &chose_delayed_over_immediate)) {
     task_queue_selector_observer_->OnTriedToSelectBlockedWorkQueue(
         chosen_blocked_queue);
@@ -333,21 +333,21 @@
     TaskQueue::QueuePriority priority,
     bool chose_delayed_over_immediate) {
   switch (priority) {
-    case TaskQueue::CONTROL_PRIORITY:
+    case TaskQueue::kControlPriority:
       break;
-    case TaskQueue::HIGH_PRIORITY:
+    case TaskQueue::kHighPriority:
       low_priority_starvation_score_ +=
           kSmallScoreIncrementForLowPriorityStarvation;
       normal_priority_starvation_score_ +=
           kSmallScoreIncrementForNormalPriorityStarvation;
       break;
-    case TaskQueue::NORMAL_PRIORITY:
+    case TaskQueue::kNormalPriority:
       low_priority_starvation_score_ +=
           kLargeScoreIncrementForLowPriorityStarvation;
       normal_priority_starvation_score_ = 0;
       break;
-    case TaskQueue::LOW_PRIORITY:
-    case TaskQueue::BEST_EFFORT_PRIORITY:
+    case TaskQueue::kLowPriority:
+    case TaskQueue::kBestEffortPriority:
       low_priority_starvation_score_ = 0;
       normal_priority_starvation_score_ = 0;
       break;
@@ -379,8 +379,8 @@
 
 bool TaskQueueSelector::EnabledWorkQueuesEmpty() const {
   DCHECK(main_thread_checker_.CalledOnValidThread());
-  for (TaskQueue::QueuePriority priority = TaskQueue::CONTROL_PRIORITY;
-       priority < TaskQueue::QUEUE_PRIORITY_COUNT;
+  for (TaskQueue::QueuePriority priority = TaskQueue::kControlPriority;
+       priority < TaskQueue::kQueuePriorityCount;
        priority = NextPriority(priority)) {
     if (!enabled_selector_.delayed_work_queue_sets()->IsSetEmpty(priority) ||
         !enabled_selector_.immediate_work_queue_sets()->IsSetEmpty(priority)) {
diff --git a/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector_unittest.cc b/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector_unittest.cc
index 629c4824..44f376d3 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/task_queue_selector_unittest.cc
@@ -112,7 +112,7 @@
       task_queues_.push_back(std::move(task_queue));
     }
     for (size_t i = 0; i < kTaskQueueCount; i++) {
-      EXPECT_EQ(TaskQueue::NORMAL_PRIORITY, task_queues_[i]->GetQueuePriority())
+      EXPECT_EQ(TaskQueue::kNormalPriority, task_queues_[i]->GetQueuePriority())
           << i;
       queue_to_index_map_.insert(std::make_pair(task_queues_[i].get(), i));
     }
@@ -151,14 +151,14 @@
 TEST_F(TaskQueueSelectorTest, TestHighPriority) {
   size_t queue_order[] = {0, 1, 2, 3, 4};
   PushTasks(queue_order, 5);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::HIGH_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kHighPriority);
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(2, 0, 1, 3, 4));
 }
 
 TEST_F(TaskQueueSelectorTest, TestLowPriority) {
   size_t queue_order[] = {0, 1, 2, 3, 4};
   PushTasks(queue_order, 5);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::LOW_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kLowPriority);
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(0, 1, 3, 4, 2));
 }
 
@@ -166,9 +166,9 @@
   size_t queue_order[] = {0, 1, 2, 3, 4};
   PushTasks(queue_order, 5);
   selector_.SetQueuePriority(task_queues_[0].get(),
-                             TaskQueue::BEST_EFFORT_PRIORITY);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::LOW_PRIORITY);
-  selector_.SetQueuePriority(task_queues_[3].get(), TaskQueue::HIGH_PRIORITY);
+                             TaskQueue::kBestEffortPriority);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kLowPriority);
+  selector_.SetQueuePriority(task_queues_[3].get(), TaskQueue::kHighPriority);
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(3, 1, 4, 2, 0));
 }
 
@@ -176,10 +176,10 @@
   size_t queue_order[] = {0, 1, 2, 3, 4};
   PushTasks(queue_order, 5);
   selector_.SetQueuePriority(task_queues_[4].get(),
-                             TaskQueue::CONTROL_PRIORITY);
-  EXPECT_EQ(TaskQueue::CONTROL_PRIORITY, task_queues_[4]->GetQueuePriority());
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::HIGH_PRIORITY);
-  EXPECT_EQ(TaskQueue::HIGH_PRIORITY, task_queues_[2]->GetQueuePriority());
+                             TaskQueue::kControlPriority);
+  EXPECT_EQ(TaskQueue::kControlPriority, task_queues_[4]->GetQueuePriority());
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kHighPriority);
+  EXPECT_EQ(TaskQueue::kHighPriority, task_queues_[2]->GetQueuePriority());
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(4, 2, 0, 1, 3));
 }
 
@@ -195,11 +195,11 @@
 
 TEST_F(TaskQueueSelectorTest,
        TestObserverWithSetQueuePriorityAndQueueAlreadyEnabled) {
-  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::HIGH_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::kHighPriority);
   MockObserver mock_observer;
   selector_.SetTaskQueueSelectorObserver(&mock_observer);
   EXPECT_CALL(mock_observer, OnTaskQueueEnabled(_)).Times(0);
-  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::NORMAL_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::kNormalPriority);
 }
 
 TEST_F(TaskQueueSelectorTest, TestDisableEnable) {
@@ -213,15 +213,15 @@
   task_queues_[4]->SetQueueEnabledForTest(false);
   selector_.DisableQueue(task_queues_[4].get());
   // Disabling a queue should not affect its priority.
-  EXPECT_EQ(TaskQueue::NORMAL_PRIORITY, task_queues_[2]->GetQueuePriority());
-  EXPECT_EQ(TaskQueue::NORMAL_PRIORITY, task_queues_[4]->GetQueuePriority());
+  EXPECT_EQ(TaskQueue::kNormalPriority, task_queues_[2]->GetQueuePriority());
+  EXPECT_EQ(TaskQueue::kNormalPriority, task_queues_[4]->GetQueuePriority());
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(0, 1, 3));
 
   EXPECT_CALL(mock_observer, OnTaskQueueEnabled(_)).Times(2);
   task_queues_[2]->SetQueueEnabledForTest(true);
   selector_.EnableQueue(task_queues_[2].get());
   selector_.SetQueuePriority(task_queues_[2].get(),
-                             TaskQueue::BEST_EFFORT_PRIORITY);
+                             TaskQueue::kBestEffortPriority);
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(2));
   task_queues_[4]->SetQueueEnabledForTest(true);
   selector_.EnableQueue(task_queues_[4].get());
@@ -233,7 +233,7 @@
   EXPECT_TRUE(task_queues_[2]->immediate_work_queue()->Empty());
 
   task_queues_[2]->SetQueueEnabledForTest(false);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::HIGH_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kHighPriority);
 
   size_t queue_order[] = {0, 1, 2, 3, 4};
   PushTasks(queue_order, 5);
@@ -242,7 +242,7 @@
   EXPECT_FALSE(task_queues_[2]->immediate_work_queue()->Empty());
   task_queues_[2]->SetQueueEnabledForTest(true);
 
-  EXPECT_EQ(TaskQueue::HIGH_PRIORITY, task_queues_[2]->GetQueuePriority());
+  EXPECT_EQ(TaskQueue::kHighPriority, task_queues_[2]->GetQueuePriority());
   EXPECT_THAT(PopTasks(), ::testing::ElementsAre(2, 0, 1, 3, 4));
 }
 
@@ -275,10 +275,10 @@
   size_t queue_order[] = {0, 1, 2, 3};
   PushTasks(queue_order, 4);
   selector_.SetQueuePriority(task_queues_[3].get(),
-                             TaskQueue::CONTROL_PRIORITY);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::HIGH_PRIORITY);
+                             TaskQueue::kControlPriority);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kHighPriority);
   selector_.SetQueuePriority(task_queues_[1].get(),
-                             TaskQueue::BEST_EFFORT_PRIORITY);
+                             TaskQueue::kBestEffortPriority);
   for (int i = 0; i < 100; i++) {
     WorkQueue* chosen_work_queue = nullptr;
     ASSERT_TRUE(selector_.SelectWorkQueueToService(&chosen_work_queue));
@@ -290,9 +290,9 @@
 TEST_F(TaskQueueSelectorTest, TestHighPriorityDoesNotStarveNormal) {
   size_t queue_order[] = {0, 1, 2};
   PushTasks(queue_order, 3);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::HIGH_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kHighPriority);
   selector_.SetQueuePriority(task_queues_[1].get(),
-                             TaskQueue::BEST_EFFORT_PRIORITY);
+                             TaskQueue::kBestEffortPriority);
   size_t counts[] = {0, 0, 0};
   for (int i = 0; i < 100; i++) {
     WorkQueue* chosen_work_queue = nullptr;
@@ -310,8 +310,8 @@
 TEST_F(TaskQueueSelectorTest, TestHighPriorityDoesNotStarveNormalOrLow) {
   size_t queue_order[] = {0, 1, 2};
   PushTasks(queue_order, 3);
-  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::HIGH_PRIORITY);
-  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::LOW_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[2].get(), TaskQueue::kHighPriority);
+  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::kLowPriority);
   size_t counts[] = {0, 0, 0};
   for (int i = 0; i < 100; i++) {
     WorkQueue* chosen_work_queue = nullptr;
@@ -330,9 +330,9 @@
 TEST_F(TaskQueueSelectorTest, TestNormalPriorityDoesNotStarveLow) {
   size_t queue_order[] = {0, 1, 2};
   PushTasks(queue_order, 3);
-  selector_.SetQueuePriority(task_queues_[0].get(), TaskQueue::LOW_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[0].get(), TaskQueue::kLowPriority);
   selector_.SetQueuePriority(task_queues_[1].get(),
-                             TaskQueue::BEST_EFFORT_PRIORITY);
+                             TaskQueue::kBestEffortPriority);
   size_t counts[] = {0, 0, 0};
   for (int i = 0; i < 100; i++) {
     WorkQueue* chosen_work_queue = nullptr;
@@ -351,22 +351,22 @@
   size_t queue_order[] = {0, 1};
   PushTasks(queue_order, 2);
   selector_.SetQueuePriority(task_queues_[0].get(),
-                             TaskQueue::BEST_EFFORT_PRIORITY);
-  EXPECT_EQ(TaskQueue::NORMAL_PRIORITY, task_queues_[1]->GetQueuePriority());
+                             TaskQueue::kBestEffortPriority);
+  EXPECT_EQ(TaskQueue::kNormalPriority, task_queues_[1]->GetQueuePriority());
   WorkQueue* chosen_work_queue = nullptr;
   for (int i = 0; i < 100; i++) {
     ASSERT_TRUE(selector_.SelectWorkQueueToService(&chosen_work_queue));
     EXPECT_EQ(task_queues_[1].get(), chosen_work_queue->task_queue());
     // Don't remove task from queue to simulate all queues still being full.
   }
-  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::HIGH_PRIORITY);
+  selector_.SetQueuePriority(task_queues_[1].get(), TaskQueue::kHighPriority);
   for (int i = 0; i < 100; i++) {
     ASSERT_TRUE(selector_.SelectWorkQueueToService(&chosen_work_queue));
     EXPECT_EQ(task_queues_[1].get(), chosen_work_queue->task_queue());
     // Don't remove task from queue to simulate all queues still being full.
   }
   selector_.SetQueuePriority(task_queues_[1].get(),
-                             TaskQueue::CONTROL_PRIORITY);
+                             TaskQueue::kControlPriority);
   for (int i = 0; i < 100; i++) {
     ASSERT_TRUE(selector_.SelectWorkQueueToService(&chosen_work_queue));
     EXPECT_EQ(task_queues_[1].get(), chosen_work_queue->task_queue());
@@ -389,7 +389,7 @@
   PushTasks(queue_order, 1);
 
   selector_.SetQueuePriority(task_queues_[0].get(),
-                             TaskQueue::CONTROL_PRIORITY);
+                             TaskQueue::kControlPriority);
 
   EXPECT_FALSE(selector_.EnabledWorkQueuesEmpty());
 }
@@ -398,7 +398,7 @@
   WorkQueue* chosen_work_queue = nullptr;
   bool chose_delayed_over_immediate = false;
   EXPECT_FALSE(enabled_selector()->ChooseOldestWithPriority(
-      TaskQueue::NORMAL_PRIORITY, &chose_delayed_over_immediate,
+      TaskQueue::kNormalPriority, &chose_delayed_over_immediate,
       &chosen_work_queue));
   EXPECT_FALSE(chose_delayed_over_immediate);
 }
@@ -411,7 +411,7 @@
   WorkQueue* chosen_work_queue = nullptr;
   bool chose_delayed_over_immediate = false;
   EXPECT_TRUE(enabled_selector()->ChooseOldestWithPriority(
-      TaskQueue::NORMAL_PRIORITY, &chose_delayed_over_immediate,
+      TaskQueue::kNormalPriority, &chose_delayed_over_immediate,
       &chosen_work_queue));
   EXPECT_EQ(chosen_work_queue, task_queues_[0]->delayed_work_queue());
   EXPECT_FALSE(chose_delayed_over_immediate);
@@ -425,7 +425,7 @@
   WorkQueue* chosen_work_queue = nullptr;
   bool chose_delayed_over_immediate = false;
   EXPECT_TRUE(enabled_selector()->ChooseOldestWithPriority(
-      TaskQueue::NORMAL_PRIORITY, &chose_delayed_over_immediate,
+      TaskQueue::kNormalPriority, &chose_delayed_over_immediate,
       &chosen_work_queue));
   EXPECT_EQ(chosen_work_queue, task_queues_[0]->immediate_work_queue());
   EXPECT_FALSE(chose_delayed_over_immediate);
@@ -474,7 +474,7 @@
   selector.DisableQueue(task_queue.get());
   selector.DisableQueue(task_queue2.get());
 
-  selector.SetQueuePriority(task_queue2.get(), TaskQueue::CONTROL_PRIORITY);
+  selector.SetQueuePriority(task_queue2.get(), TaskQueue::kControlPriority);
 
   TaskQueueImpl::Task task1(TaskQueue::PostedTask(test_closure_, FROM_HERE),
                             base::TimeTicks(), 0);
@@ -547,7 +547,7 @@
   WorkQueue* chosen_work_queue = nullptr;
   bool chose_delayed_over_immediate = false;
   EXPECT_TRUE(enabled_selector()->ChooseOldestWithPriority(
-      TaskQueue::NORMAL_PRIORITY, &chose_delayed_over_immediate,
+      TaskQueue::kNormalPriority, &chose_delayed_over_immediate,
       &chosen_work_queue));
   EXPECT_EQ(chosen_work_queue->task_queue(), task_queues_[0].get());
   EXPECT_STREQ(chosen_work_queue->name(), GetParam().expected_work_queue_name);
diff --git a/third_party/WebKit/Source/platform/scheduler/base/work_queue.cc b/third_party/WebKit/Source/platform/scheduler/base/work_queue.cc
index 69f93cb..e28f4814c 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/work_queue.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/work_queue.cc
@@ -106,7 +106,7 @@
 
   TaskQueueImpl::Task pending_task = work_queue_.TakeFirst();
   // NB immediate tasks have a different pipeline to delayed ones.
-  if (queue_type_ == QueueType::IMMEDIATE && work_queue_.empty()) {
+  if (queue_type_ == QueueType::kImmediate && work_queue_.empty()) {
     // Short-circuit the queue reload so that OnPopQueue does the right thing.
     work_queue_ = task_queue_->TakeImmediateIncomingQueue();
   }
diff --git a/third_party/WebKit/Source/platform/scheduler/base/work_queue.h b/third_party/WebKit/Source/platform/scheduler/base/work_queue.h
index ed4217de..06604adc 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/work_queue.h
+++ b/third_party/WebKit/Source/platform/scheduler/base/work_queue.h
@@ -32,7 +32,7 @@
 // throttling mechanisms.
 class PLATFORM_EXPORT WorkQueue {
  public:
-  enum class QueueType { DELAYED, IMMEDIATE };
+  enum class QueueType { kDelayed, kImmediate };
 
   WorkQueue(TaskQueueImpl* task_queue, const char* name, QueueType queue_type);
   ~WorkQueue();
diff --git a/third_party/WebKit/Source/platform/scheduler/base/work_queue_sets_unittest.cc b/third_party/WebKit/Source/platform/scheduler/base/work_queue_sets_unittest.cc
index b927eb2..1879bed 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/work_queue_sets_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/work_queue_sets_unittest.cc
@@ -36,9 +36,9 @@
 
   WorkQueue* NewTaskQueue(const char* queue_name) {
     WorkQueue* queue =
-        new WorkQueue(nullptr, "test", WorkQueue::QueueType::IMMEDIATE);
+        new WorkQueue(nullptr, "test", WorkQueue::QueueType::kImmediate);
     work_queues_.push_back(base::WrapUnique(queue));
-    work_queue_sets_->AddQueue(queue, TaskQueue::CONTROL_PRIORITY);
+    work_queue_sets_->AddQueue(queue, TaskQueue::kControlPriority);
     return queue;
   }
 
@@ -56,7 +56,7 @@
 
 TEST_F(WorkQueueSetsTest, ChangeSetIndex) {
   WorkQueue* work_queue = NewTaskQueue("queue");
-  size_t set = TaskQueue::NORMAL_PRIORITY;
+  size_t set = TaskQueue::kNormalPriority;
   work_queue_sets_->ChangeSetIndex(work_queue, set);
 
   EXPECT_EQ(set, work_queue->work_queue_set_index());
@@ -64,7 +64,7 @@
 
 TEST_F(WorkQueueSetsTest, GetOldestQueueInSet_QueueEmpty) {
   WorkQueue* work_queue = NewTaskQueue("queue");
-  size_t set = TaskQueue::NORMAL_PRIORITY;
+  size_t set = TaskQueue::kNormalPriority;
   work_queue_sets_->ChangeSetIndex(work_queue, set);
 
   WorkQueue* selected_work_queue;
@@ -74,7 +74,7 @@
 
 TEST_F(WorkQueueSetsTest, OnTaskPushedToEmptyQueue) {
   WorkQueue* work_queue = NewTaskQueue("queue");
-  size_t set = TaskQueue::NORMAL_PRIORITY;
+  size_t set = TaskQueue::kNormalPriority;
   work_queue_sets_->ChangeSetIndex(work_queue, set);
 
   WorkQueue* selected_work_queue;
@@ -281,7 +281,7 @@
   queue1->Push(FakeTaskWithEnqueueOrder(8));
   queue2->Push(FakeTaskWithEnqueueOrder(9));
 
-  size_t set = TaskQueue::CONTROL_PRIORITY;
+  size_t set = TaskQueue::kControlPriority;
 
   WorkQueue* selected_work_queue;
   EXPECT_TRUE(work_queue_sets_->GetOldestQueueInSet(set, &selected_work_queue));
diff --git a/third_party/WebKit/Source/platform/scheduler/base/work_queue_unittest.cc b/third_party/WebKit/Source/platform/scheduler/base/work_queue_unittest.cc
index 78495f2..52364b9 100644
--- a/third_party/WebKit/Source/platform/scheduler/base/work_queue_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/base/work_queue_unittest.cc
@@ -28,7 +28,7 @@
                                                   TaskQueue::Spec("test"));
 
     work_queue_.reset(new WorkQueue(task_queue_.get(), "test",
-                                    WorkQueue::QueueType::IMMEDIATE));
+                                    WorkQueue::QueueType::kImmediate));
     work_queue_sets_.reset(new WorkQueueSets(1, "test"));
     work_queue_sets_->AddQueue(work_queue_.get(), 0);
   }
diff --git a/third_party/WebKit/Source/platform/scheduler/child/idle_canceled_delayed_task_sweeper_unittest.cc b/third_party/WebKit/Source/platform/scheduler/child/idle_canceled_delayed_task_sweeper_unittest.cc
index 56147c5..cb34378 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/idle_canceled_delayed_task_sweeper_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/idle_canceled_delayed_task_sweeper_unittest.cc
@@ -45,7 +45,7 @@
                            base::TimeDelta::FromSeconds(30),
                            scheduler_helper_->NewTaskQueue(
                                MainThreadTaskQueue::QueueCreationParams(
-                                   MainThreadTaskQueue::QueueType::TEST)))),
+                                   MainThreadTaskQueue::QueueType::kTest)))),
         idle_canceled_delayed_taks_sweeper_(
             new IdleCanceledDelayedTaskSweeper(scheduler_helper_.get(),
                                                idle_helper_->IdleTaskRunner())),
diff --git a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
index 1cf1884..905aec8 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.cc
@@ -40,8 +40,8 @@
       base::MakeRefCounted<SingleThreadIdleTaskRunner>(idle_queue_, this);
 
   // This fence will block any idle tasks from running.
-  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
-  idle_queue_->SetQueuePriority(TaskQueue::BEST_EFFORT_PRIORITY);
+  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
+  idle_queue_->SetQueuePriority(TaskQueue::kBestEffortPriority);
 }
 
 IdleHelper::~IdleHelper() {
@@ -75,7 +75,7 @@
 
   if (!delegate_->CanEnterLongIdlePeriod(now,
                                          next_long_idle_period_delay_out)) {
-    return IdlePeriodState::NOT_IN_IDLE_PERIOD;
+    return IdlePeriodState::kNotInIdlePeriod;
   }
 
   base::TimeTicks next_pending_delayed_task;
@@ -95,17 +95,17 @@
       base::TimeDelta::FromMilliseconds(kMinimumIdlePeriodDurationMillis)) {
     *next_long_idle_period_delay_out = long_idle_period_duration;
     if (!idle_queue_->HasTaskToRunImmediately()) {
-      return IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED;
+      return IdlePeriodState::kInLongIdlePeriodPaused;
     } else if (long_idle_period_duration == max_long_idle_period_duration) {
-      return IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE;
+      return IdlePeriodState::kInLongIdlePeriodWithMaxDeadline;
     } else {
-      return IdlePeriodState::IN_LONG_IDLE_PERIOD;
+      return IdlePeriodState::kInLongIdlePeriod;
     }
   } else {
     // If we can't start the idle period yet then try again after wake-up.
     *next_long_idle_period_delay_out = base::TimeDelta::FromMilliseconds(
         kRetryEnableLongIdlePeriodDelayMillis);
-    return IdlePeriodState::NOT_IN_IDLE_PERIOD;
+    return IdlePeriodState::kNotInIdlePeriod;
   }
 }
 
@@ -185,7 +185,7 @@
 
   // Use a fence to make sure any idle tasks posted after this point do not run
   // until the next idle period and unblock existing tasks.
-  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::NOW);
+  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::kNow);
 
   state_.UpdateState(new_state, idle_period_deadline, now);
 }
@@ -208,8 +208,8 @@
   helper_->RemoveTaskObserver(this);
 
   // This fence will block any idle tasks from running.
-  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
-  state_.UpdateState(IdlePeriodState::NOT_IN_IDLE_PERIOD, base::TimeTicks(),
+  idle_queue_->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
+  state_.UpdateState(IdlePeriodState::kNotInIdlePeriod, base::TimeTicks(),
                      base::TimeTicks());
 }
 
@@ -223,8 +223,7 @@
   DCHECK(IsInIdlePeriod(state_.idle_period_state()));
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                "DidProcessTask");
-  if (state_.idle_period_state() !=
-          IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED &&
+  if (state_.idle_period_state() != IdlePeriodState::kInLongIdlePeriodPaused &&
       helper_->scheduler_tqm_delegate()->NowTicks() >=
           state_.idle_period_deadline()) {
     // If the idle period deadline has now been reached, either end the idle
@@ -232,8 +231,7 @@
     if (IsInLongIdlePeriod(state_.idle_period_state())) {
       EnableLongIdlePeriod();
     } else {
-      DCHECK(IdlePeriodState::IN_SHORT_IDLE_PERIOD ==
-             state_.idle_period_state());
+      DCHECK(IdlePeriodState::kInShortIdlePeriod == state_.idle_period_state());
       EndIdlePeriod();
     }
   }
@@ -249,7 +247,7 @@
   if (!idle_queue_->HasTaskToRunImmediately()) {
     // If there are no more idle tasks then pause long idle period ticks until a
     // new idle task is posted.
-    state_.UpdateState(IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED,
+    state_.UpdateState(IdlePeriodState::kInLongIdlePeriodPaused,
                        state_.idle_period_deadline(), base::TimeTicks());
   } else if (idle_queue_->BlockedByFence()) {
     // If there is still idle work to do then just start the next idle period.
@@ -293,8 +291,7 @@
   if (is_shutdown_)
     return;
   delegate_->OnPendingTasksChanged(true);
-  if (state_.idle_period_state() ==
-      IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED) {
+  if (state_.idle_period_state() == IdlePeriodState::kInLongIdlePeriodPaused) {
     // Restart long idle period ticks.
     helper_->ControlTaskQueue()->PostTask(
         FROM_HERE, enable_next_long_idle_period_closure_.GetCallback());
@@ -325,14 +322,14 @@
 
 // static
 bool IdleHelper::IsInIdlePeriod(IdlePeriodState state) {
-  return state != IdlePeriodState::NOT_IN_IDLE_PERIOD;
+  return state != IdlePeriodState::kNotInIdlePeriod;
 }
 
 // static
 bool IdleHelper::IsInLongIdlePeriod(IdlePeriodState state) {
-  return state == IdlePeriodState::IN_LONG_IDLE_PERIOD ||
-         state == IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE ||
-         state == IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED;
+  return state == IdlePeriodState::kInLongIdlePeriod ||
+         state == IdlePeriodState::kInLongIdlePeriodWithMaxDeadline ||
+         state == IdlePeriodState::kInLongIdlePeriodPaused;
 }
 
 bool IdleHelper::CanExceedIdleDeadlineIfRequired() const {
@@ -340,7 +337,7 @@
                "CanExceedIdleDeadlineIfRequired");
   helper_->CheckOnValidThread();
   return state_.idle_period_state() ==
-         IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE;
+         IdlePeriodState::kInLongIdlePeriodWithMaxDeadline;
 }
 
 IdleHelper::IdlePeriodState IdleHelper::SchedulerIdlePeriodState() const {
@@ -352,7 +349,7 @@
                          const char* idle_period_tracing_name)
     : helper_(helper),
       delegate_(delegate),
-      idle_period_state_(IdlePeriodState::NOT_IN_IDLE_PERIOD),
+      idle_period_state_(IdlePeriodState::kNotInIdlePeriod),
       idle_period_trace_event_started_(false),
       running_idle_task_for_tracing_(false),
       idle_period_tracing_name_(idle_period_tracing_name) {}
@@ -461,16 +458,16 @@
       TRACE_EVENT_ASYNC_STEP_INTO0("renderer.scheduler",
                                    idle_period_tracing_name_, this,
                                    "RunningIdleTask");
-    } else if (new_state == IdlePeriodState::IN_SHORT_IDLE_PERIOD) {
+    } else if (new_state == IdlePeriodState::kInShortIdlePeriod) {
       TRACE_EVENT_ASYNC_STEP_INTO0("renderer.scheduler",
                                    idle_period_tracing_name_, this,
                                    "ShortIdlePeriod");
     } else if (IsInLongIdlePeriod(new_state) &&
-               new_state != IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED) {
+               new_state != IdlePeriodState::kInLongIdlePeriodPaused) {
       TRACE_EVENT_ASYNC_STEP_INTO0("renderer.scheduler",
                                    idle_period_tracing_name_, this,
                                    "LongIdlePeriod");
-    } else if (new_state == IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED) {
+    } else if (new_state == IdlePeriodState::kInLongIdlePeriodPaused) {
       TRACE_EVENT_ASYNC_STEP_INTO0("renderer.scheduler",
                                    idle_period_tracing_name_, this,
                                    "LongIdlePeriodPaused");
@@ -486,15 +483,15 @@
 const char* IdleHelper::IdlePeriodStateToString(
     IdlePeriodState idle_period_state) {
   switch (idle_period_state) {
-    case IdlePeriodState::NOT_IN_IDLE_PERIOD:
+    case IdlePeriodState::kNotInIdlePeriod:
       return "not_in_idle_period";
-    case IdlePeriodState::IN_SHORT_IDLE_PERIOD:
+    case IdlePeriodState::kInShortIdlePeriod:
       return "in_short_idle_period";
-    case IdlePeriodState::IN_LONG_IDLE_PERIOD:
+    case IdlePeriodState::kInLongIdlePeriod:
       return "in_long_idle_period";
-    case IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE:
+    case IdlePeriodState::kInLongIdlePeriodWithMaxDeadline:
       return "in_long_idle_period_with_max_deadline";
-    case IdlePeriodState::IN_LONG_IDLE_PERIOD_PAUSED:
+    case IdlePeriodState::kInLongIdlePeriodPaused:
       return "in_long_idle_period_paused";
     default:
       NOTREACHED();
diff --git a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
index d8eab8a..b498c22 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/idle_helper.h
@@ -76,14 +76,14 @@
 
   // Keep IdleHelper::IdlePeriodStateToString in sync with this enum.
   enum class IdlePeriodState {
-    NOT_IN_IDLE_PERIOD,
-    IN_SHORT_IDLE_PERIOD,
-    IN_LONG_IDLE_PERIOD,
-    IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE,
-    IN_LONG_IDLE_PERIOD_PAUSED,
+    kNotInIdlePeriod,
+    kInShortIdlePeriod,
+    kInLongIdlePeriod,
+    kInLongIdlePeriodWithMaxDeadline,
+    kInLongIdlePeriodPaused,
     // Must be the last entry.
-    IDLE_PERIOD_STATE_COUNT,
-    FIRST_IDLE_PERIOD_STATE = NOT_IN_IDLE_PERIOD,
+    kIdlePeriodStateCount,
+    kFirstIdlePeriodState = kNotInIdlePeriod,
   };
 
   // The maximum length of an idle period.
diff --git a/third_party/WebKit/Source/platform/scheduler/child/idle_helper_unittest.cc b/third_party/WebKit/Source/platform/scheduler/child/idle_helper_unittest.cc
index 6f8b670..2cb90bb 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/idle_helper_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/idle_helper_unittest.cc
@@ -273,8 +273,8 @@
 
   static void CheckAllTaskQueueIdToString() {
     CallForEachEnumValue<IdleHelper::IdlePeriodState>(
-        IdleHelper::IdlePeriodState::FIRST_IDLE_PERIOD_STATE,
-        IdleHelper::IdlePeriodState::IDLE_PERIOD_STATE_COUNT,
+        IdleHelper::IdlePeriodState::kFirstIdlePeriodState,
+        IdleHelper::IdlePeriodState::kIdlePeriodStateCount,
         &IdleHelper::IdlePeriodStateToString);
   }
 
@@ -353,9 +353,8 @@
   RunUntilIdle();
   EXPECT_EQ(0, run_count);
 
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      expected_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), expected_deadline);
   RunUntilIdle();
   EXPECT_EQ(1, run_count);
   EXPECT_EQ(expected_deadline, deadline_in_task);
@@ -373,7 +372,7 @@
   EXPECT_EQ(0, run_count);
 
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   idle_helper_->EndIdlePeriod();
   RunUntilIdle();
@@ -390,7 +389,7 @@
       base::Bind(&RepostingIdleTestTask, base::RetainedRef(idle_task_runner_),
                  &run_count, &actual_deadline));
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   RunUntilIdle();
   EXPECT_EQ(1, run_count);
@@ -400,7 +399,7 @@
   EXPECT_EQ(1, run_count);
 
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   RunUntilIdle();
   EXPECT_EQ(2, run_count);
@@ -418,7 +417,7 @@
       base::Bind(&UpdateClockToDeadlineIdleTestTask, clock_.get(), &run_count));
 
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   RunUntilIdle();
   // Only the first idle task should execute since it's used up the deadline.
@@ -426,7 +425,7 @@
 
   idle_helper_->EndIdlePeriod();
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   RunUntilIdle();
   // Second task should be run on the next idle period.
@@ -467,7 +466,7 @@
   ExpectIdlePeriodStartsButNeverEnds();
 
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
 }
 
@@ -483,7 +482,7 @@
   ExpectIdlePeriodStartsAndEnds(Exactly(1));
 
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   idle_helper_->EndIdlePeriod();
 }
@@ -506,7 +505,7 @@
       }
     }
     idle_helper_->StartIdlePeriod(
-        IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+        IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
         clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
     base::RunLoop().RunUntilIdle();
   }
@@ -547,7 +546,7 @@
                  base::Unretained(&tasks_to_post_from_nested_loop)));
 
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   RunUntilIdle();
   // Note we expect task 3 to run last because it's non-nestable.
@@ -848,7 +847,7 @@
       base::Bind(&TestCanExceedIdleDeadlineIfRequiredTask, idle_helper_.get(),
                  &can_exceed_idle_deadline, &run_count));
   idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
+      IdleHelper::IdlePeriodState::kInShortIdlePeriod, clock_->NowTicks(),
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(10));
   RunUntilIdle();
   EXPECT_EQ(1, run_count);
@@ -1037,15 +1036,13 @@
   base::TimeTicks more_than_min_deadline(
       clock_->NowTicks() + minimum_idle_period_duration() + half_a_ms);
 
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      less_than_min_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), less_than_min_deadline);
   RunUntilIdle();
   EXPECT_EQ(0, run_count);
 
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      more_than_min_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), more_than_min_deadline);
   RunUntilIdle();
   EXPECT_EQ(1, run_count);
 }
@@ -1125,17 +1122,15 @@
   clock_->Advance(base::TimeDelta::FromMilliseconds(100));
 
   // It shouldn't run until the delay is over even though we went idle.
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      expected_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), expected_deadline);
   EXPECT_EQ(0u, idle_queue()->GetNumberOfPendingTasks());
   RunUntilIdle();
   EXPECT_EQ(0, run_count);
 
   clock_->Advance(base::TimeDelta::FromMilliseconds(100));
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      expected_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), expected_deadline);
   EXPECT_EQ(1u, idle_queue()->GetNumberOfPendingTasks());
   RunUntilIdle();
 
@@ -1166,9 +1161,8 @@
   RunUntilIdle();
   EXPECT_EQ(0, run_count);
 
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      expected_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), expected_deadline);
   RunUntilIdle();
   EXPECT_EQ(1, run_count);
   EXPECT_EQ(expected_deadline, deadline_in_task);
@@ -1200,9 +1194,8 @@
   RunUntilIdle();
   EXPECT_EQ(0, run_count);
 
-  idle_helper_->StartIdlePeriod(
-      IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, clock_->NowTicks(),
-      expected_deadline);
+  idle_helper_->StartIdlePeriod(IdleHelper::IdlePeriodState::kInShortIdlePeriod,
+                                clock_->NowTicks(), expected_deadline);
   RunUntilIdle();
   EXPECT_EQ(2, run_count);
   EXPECT_EQ(expected_deadline, deadline_in_task);
diff --git a/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.cc b/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.cc
index fe5df991..beadc92 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.cc
+++ b/third_party/WebKit/Source/platform/scheduler/child/scheduler_helper.cc
@@ -24,7 +24,7 @@
 void SchedulerHelper::InitDefaultQueues(
     scoped_refptr<TaskQueue> default_task_queue,
     scoped_refptr<TaskQueue> control_task_queue) {
-  control_task_queue->SetQueuePriority(TaskQueue::CONTROL_PRIORITY);
+  control_task_queue->SetQueuePriority(TaskQueue::kControlPriority);
 
   DCHECK(task_queue_manager_delegate_);
   task_queue_manager_delegate_->SetDefaultTaskRunner(default_task_queue);
diff --git a/third_party/WebKit/Source/platform/scheduler/child/web_scheduler.h b/third_party/WebKit/Source/platform/scheduler/child/web_scheduler.h
index 2a6c394b..c5d987b 100644
--- a/third_party/WebKit/Source/platform/scheduler/child/web_scheduler.h
+++ b/third_party/WebKit/Source/platform/scheduler/child/web_scheduler.h
@@ -74,7 +74,7 @@
   // Returns a WebTaskRunner for timer tasks. Can be called from any thread.
   virtual WebTaskRunner* TimerTaskRunner() = 0;
 
-  // Returns a WebTaskRunner for V8 tasks. Can be called from any thread.
+  // Returns a WebTaskRunner for kV8 tasks. Can be called from any thread.
   virtual WebTaskRunner* V8TaskRunner() = 0;
 
   // Returns a WebTaskRunner for compositor tasks. This is intended only to be
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/budget_pool_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/budget_pool_unittest.cc
index 0e22ef3..16d1e36 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/budget_pool_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/budget_pool_unittest.cc
@@ -133,7 +133,7 @@
       task_queue_throttler_->CreateWakeUpBudgetPool("test");
 
   scoped_refptr<TaskQueue> queue = scheduler_->NewTimerTaskQueue(
-      MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+      MainThreadTaskQueue::QueueType::kFrameThrottleable);
 
   pool->SetWakeUpRate(0.1);
   pool->SetWakeUpDuration(base::TimeDelta::FromMilliseconds(10));
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_scheduler_helper.cc b/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_scheduler_helper.cc
index f2151ff..7b70aeb4 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_scheduler_helper.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_scheduler_helper.cc
@@ -17,11 +17,11 @@
       renderer_scheduler_(renderer_scheduler),
       default_task_queue_(
           NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-                           MainThreadTaskQueue::QueueType::DEFAULT)
+                           MainThreadTaskQueue::QueueType::kDefault)
                            .SetShouldMonitorQuiescence(true))),
       control_task_queue_(
           NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-                           MainThreadTaskQueue::QueueType::CONTROL)
+                           MainThreadTaskQueue::QueueType::kControl)
                            .SetShouldNotifyObservers(false))) {
   InitDefaultQueues(default_task_queue_, control_task_queue_);
 }
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.cc b/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.cc
index ad2d26af..d8a7474 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.cc
@@ -14,41 +14,41 @@
 const char* MainThreadTaskQueue::NameForQueueType(
     MainThreadTaskQueue::QueueType queue_type) {
   switch (queue_type) {
-    case MainThreadTaskQueue::QueueType::CONTROL:
+    case MainThreadTaskQueue::QueueType::kControl:
       return "ControlTQ";
-    case MainThreadTaskQueue::QueueType::DEFAULT:
+    case MainThreadTaskQueue::QueueType::kDefault:
       return "DefaultTQ";
-    case MainThreadTaskQueue::QueueType::DEFAULT_LOADING:
+    case MainThreadTaskQueue::QueueType::kDefaultLoading:
       return "DefaultLoadingTQ";
-    case MainThreadTaskQueue::QueueType::DEFAULT_TIMER:
+    case MainThreadTaskQueue::QueueType::kDefaultTimer:
       return "DefaultTimerTQ";
-    case MainThreadTaskQueue::QueueType::UNTHROTTLED:
+    case MainThreadTaskQueue::QueueType::kUnthrottled:
       return "UnthrottledTQ";
-    case MainThreadTaskQueue::QueueType::FRAME_LOADING:
+    case MainThreadTaskQueue::QueueType::kFrameLoading:
       return "FrameLoadingTQ";
-    case MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE:
+    case MainThreadTaskQueue::QueueType::kFrameThrottleable:
       return "FrameThrottleableTQ";
-    case MainThreadTaskQueue::QueueType::FRAME_DEFERRABLE:
+    case MainThreadTaskQueue::QueueType::kFrameDeferrable:
       return "FrameDeferrableTQ";
-    case MainThreadTaskQueue::QueueType::FRAME_PAUSABLE:
+    case MainThreadTaskQueue::QueueType::kFramePausable:
       return "FramePausableTQ";
-    case MainThreadTaskQueue::QueueType::FRAME_UNPAUSABLE:
+    case MainThreadTaskQueue::QueueType::kFrameUnpausable:
       return "FrameUnpausableTQ";
-    case MainThreadTaskQueue::QueueType::COMPOSITOR:
+    case MainThreadTaskQueue::QueueType::kCompositor:
       return "CompositorTQ";
-    case MainThreadTaskQueue::QueueType::IDLE:
+    case MainThreadTaskQueue::QueueType::kIdle:
       return "IdleTQ";
-    case MainThreadTaskQueue::QueueType::TEST:
+    case MainThreadTaskQueue::QueueType::kTest:
       return "TestTQ";
-    case MainThreadTaskQueue::QueueType::FRAME_LOADING_CONTROL:
+    case MainThreadTaskQueue::QueueType::kFrameLoading_kControl:
       return "FrameLoadingControlTQ";
-    case MainThreadTaskQueue::QueueType::V8:
+    case MainThreadTaskQueue::QueueType::kV8:
       return "V8TQ";
-    case MainThreadTaskQueue::QueueType::IPC:
+    case MainThreadTaskQueue::QueueType::kIPC:
       return "IPCTQ";
-    case MainThreadTaskQueue::QueueType::OTHER:
+    case MainThreadTaskQueue::QueueType::kOther:
       return "OtherTQ";
-    case MainThreadTaskQueue::QueueType::COUNT:
+    case MainThreadTaskQueue::QueueType::kCount:
       NOTREACHED();
       return nullptr;
   }
@@ -59,33 +59,33 @@
 MainThreadTaskQueue::QueueClass MainThreadTaskQueue::QueueClassForQueueType(
     QueueType type) {
   switch (type) {
-    case QueueType::CONTROL:
-    case QueueType::DEFAULT:
-    case QueueType::IDLE:
-    case QueueType::TEST:
-    case QueueType::V8:
-    case QueueType::IPC:
-      return QueueClass::NONE;
-    case QueueType::DEFAULT_LOADING:
-    case QueueType::FRAME_LOADING:
-    case QueueType::FRAME_LOADING_CONTROL:
-      return QueueClass::LOADING;
-    case QueueType::DEFAULT_TIMER:
-    case QueueType::UNTHROTTLED:
-    case QueueType::FRAME_THROTTLEABLE:
-    case QueueType::FRAME_DEFERRABLE:
-    case QueueType::FRAME_PAUSABLE:
-    case QueueType::FRAME_UNPAUSABLE:
-      return QueueClass::TIMER;
-    case QueueType::COMPOSITOR:
-      return QueueClass::COMPOSITOR;
-    case QueueType::OTHER:
-    case QueueType::COUNT:
+    case QueueType::kControl:
+    case QueueType::kDefault:
+    case QueueType::kIdle:
+    case QueueType::kTest:
+    case QueueType::kV8:
+    case QueueType::kIPC:
+      return QueueClass::kNone;
+    case QueueType::kDefaultLoading:
+    case QueueType::kFrameLoading:
+    case QueueType::kFrameLoading_kControl:
+      return QueueClass::kLoading;
+    case QueueType::kDefaultTimer:
+    case QueueType::kUnthrottled:
+    case QueueType::kFrameThrottleable:
+    case QueueType::kFrameDeferrable:
+    case QueueType::kFramePausable:
+    case QueueType::kFrameUnpausable:
+      return QueueClass::kTimer;
+    case QueueType::kCompositor:
+      return QueueClass::kCompositor;
+    case QueueType::kOther:
+    case QueueType::kCount:
       DCHECK(false);
-      return QueueClass::COUNT;
+      return QueueClass::kCount;
   }
   NOTREACHED();
-  return QueueClass::NONE;
+  return QueueClass::kNone;
 }
 
 MainThreadTaskQueue::MainThreadTaskQueue(
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.h b/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.h
index 4377857..aaf4ecb 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/main_thread_task_queue.h
@@ -23,30 +23,30 @@
     // This enum is used for a histogram and it should not be re-numbered.
     // TODO(altimin): Clean up obsolete names and use a new histogram when
     // the situation settles.
-    CONTROL = 0,
-    DEFAULT = 1,
-    DEFAULT_LOADING = 2,
-    // DEFAULT_TIMER is deprecated and should be replaced with appropriate
+    kControl = 0,
+    kDefault = 1,
+    kDefaultLoading = 2,
+    // kDefaultTimer is deprecated and should be replaced with appropriate
     // per-frame task queues.
-    DEFAULT_TIMER = 3,
-    UNTHROTTLED = 4,
-    FRAME_LOADING = 5,
-    // 6 : FRAME_THROTTLEABLE, replaced with FRAME_THROTTLEABLE.
-    // 7 : FRAME_PAUSABLE, replaced with FRAME_PAUSABLE
-    COMPOSITOR = 8,
-    IDLE = 9,
-    TEST = 10,
-    FRAME_LOADING_CONTROL = 11,
-    FRAME_THROTTLEABLE = 12,
-    FRAME_DEFERRABLE = 13,
-    FRAME_PAUSABLE = 14,
-    FRAME_UNPAUSABLE = 15,
-    V8 = 16,
-    IPC = 17,
+    kDefaultTimer = 3,
+    kUnthrottled = 4,
+    kFrameLoading = 5,
+    // 6 : kFrameThrottleable, replaced with FRAME_THROTTLEABLE.
+    // 7 : kFramePausable, replaced with kFramePausable
+    kCompositor = 8,
+    kIdle = 9,
+    kTest = 10,
+    kFrameLoading_kControl = 11,
+    kFrameThrottleable = 12,
+    kFrameDeferrable = 13,
+    kFramePausable = 14,
+    kFrameUnpausable = 15,
+    kV8 = 16,
+    kIPC = 17,
 
     // Used to group multiple types when calculating Expected Queueing Time.
-    OTHER = 18,
-    COUNT = 19
+    kOther = 18,
+    kCount = 19
   };
 
   // Returns name of the given queue type. Returned string has application
@@ -55,12 +55,12 @@
 
   // High-level category used by RendererScheduler to make scheduling decisions.
   enum class QueueClass {
-    NONE = 0,
-    LOADING = 1,
-    TIMER = 2,
-    COMPOSITOR = 4,
+    kNone = 0,
+    kLoading = 1,
+    kTimer = 2,
+    kCompositor = 4,
 
-    COUNT = 5
+    kCount = 5,
   };
 
   static QueueClass QueueClassForQueueType(QueueType type);
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.cc b/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.cc
index 26b8b88..51dc4206 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.cc
@@ -103,35 +103,35 @@
 const char* QueueingTimeEstimator::Calculator::GetReportingMessageFromQueueType(
     MainThreadTaskQueue::QueueType queue_type) {
   switch (queue_type) {
-    case MainThreadTaskQueue::QueueType::DEFAULT:
+    case MainThreadTaskQueue::QueueType::kDefault:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.Default";
-    case MainThreadTaskQueue::QueueType::DEFAULT_LOADING:
+    case MainThreadTaskQueue::QueueType::kDefaultLoading:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType."
              "DefaultLoading";
-    case MainThreadTaskQueue::QueueType::UNTHROTTLED:
+    case MainThreadTaskQueue::QueueType::kUnthrottled:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType."
              "Unthrottled";
-    case MainThreadTaskQueue::QueueType::FRAME_LOADING:
+    case MainThreadTaskQueue::QueueType::kFrameLoading:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType."
              "FrameLoading";
-    case MainThreadTaskQueue::QueueType::COMPOSITOR:
+    case MainThreadTaskQueue::QueueType::kCompositor:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.Compositor";
-    case MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE:
+    case MainThreadTaskQueue::QueueType::kFrameThrottleable:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType."
              "FrameThrottleable";
-    case MainThreadTaskQueue::QueueType::FRAME_PAUSABLE:
+    case MainThreadTaskQueue::QueueType::kFramePausable:
       return "RendererScheduler.ExpectedQueueingTimeByTaskQueueType."
              "FramePausable";
-    case MainThreadTaskQueue::QueueType::CONTROL:
-    case MainThreadTaskQueue::QueueType::DEFAULT_TIMER:
-    case MainThreadTaskQueue::QueueType::IDLE:
-    case MainThreadTaskQueue::QueueType::TEST:
-    case MainThreadTaskQueue::QueueType::FRAME_LOADING_CONTROL:
-    case MainThreadTaskQueue::QueueType::FRAME_DEFERRABLE:
-    case MainThreadTaskQueue::QueueType::FRAME_UNPAUSABLE:
-    case MainThreadTaskQueue::QueueType::V8:
-    case MainThreadTaskQueue::QueueType::OTHER:
-    case MainThreadTaskQueue::QueueType::COUNT:
+    case MainThreadTaskQueue::QueueType::kControl:
+    case MainThreadTaskQueue::QueueType::kDefaultTimer:
+    case MainThreadTaskQueue::QueueType::kIdle:
+    case MainThreadTaskQueue::QueueType::kTest:
+    case MainThreadTaskQueue::QueueType::kFrameLoading_kControl:
+    case MainThreadTaskQueue::QueueType::kFrameDeferrable:
+    case MainThreadTaskQueue::QueueType::kFrameUnpausable:
+    case MainThreadTaskQueue::QueueType::kV8:
+    case MainThreadTaskQueue::QueueType::kOther:
+    case MainThreadTaskQueue::QueueType::kCount:
     // Using default here as well because there are some values less than COUNT
     // that have been removed and do not correspond to any QueueType.
     default:
@@ -143,49 +143,49 @@
 const char* QueueingTimeEstimator::Calculator::GetReportingMessageFromFrameType(
     FrameType frame_type) {
   switch (frame_type) {
-    case FrameType::MAIN_FRAME_VISIBLE:
-    case FrameType::MAIN_FRAME_VISIBLE_SERVICE:
+    case FrameType::kMainFrameVisible:
+    case FrameType::kMainFrameVisibleService:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "MainFrameVisible";
-    case FrameType::MAIN_FRAME_HIDDEN:
-    case FrameType::MAIN_FRAME_HIDDEN_SERVICE:
+    case FrameType::kMainFrameHidden:
+    case FrameType::kMainFrameHiddenService:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "MainFrameHidden";
-    case FrameType::MAIN_FRAME_BACKGROUND:
-    case FrameType::MAIN_FRAME_BACKGROUND_EXEMPT_SELF:
-    case FrameType::MAIN_FRAME_BACKGROUND_EXEMPT_OTHER:
+    case FrameType::kMainFrameBackground:
+    case FrameType::kMainFrameBackgroundExemptSelf:
+    case FrameType::kMainFrameBackgroundExemptOther:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "MainFrameBackground";
-    case FrameType::SAME_ORIGIN_VISIBLE:
-    case FrameType::SAME_ORIGIN_VISIBLE_SERVICE:
+    case FrameType::kSameOriginVisible:
+    case FrameType::kSameOriginVisibleService:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "SameOriginVisible";
-    case FrameType::SAME_ORIGIN_HIDDEN:
-    case FrameType::SAME_ORIGIN_HIDDEN_SERVICE:
+    case FrameType::kSameOriginHidden:
+    case FrameType::kSameOriginHiddenService:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "SameOriginHidden";
-    case FrameType::SAME_ORIGIN_BACKGROUND:
-    case FrameType::SAME_ORIGIN_BACKGROUND_EXEMPT_SELF:
-    case FrameType::SAME_ORIGIN_BACKGROUND_EXEMPT_OTHER:
+    case FrameType::kSameOriginBackground:
+    case FrameType::kSameOriginBackgroundExemptSelf:
+    case FrameType::kSameOriginBackgroundExemptOther:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "SameOriginBackground";
-    case FrameType::CROSS_ORIGIN_VISIBLE:
-    case FrameType::CROSS_ORIGIN_VISIBLE_SERVICE:
+    case FrameType::kCrossOriginVisible:
+    case FrameType::kCrossOriginVisibleService:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "CrossOriginVisible";
-    case FrameType::CROSS_ORIGIN_HIDDEN:
-    case FrameType::CROSS_ORIGIN_HIDDEN_SERVICE:
+    case FrameType::kCrossOriginHidden:
+    case FrameType::kCrossOriginHiddenService:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "CrossOriginHidden";
-    case FrameType::CROSS_ORIGIN_BACKGROUND:
-    case FrameType::CROSS_ORIGIN_BACKGROUND_EXEMPT_SELF:
-    case FrameType::CROSS_ORIGIN_BACKGROUND_EXEMPT_OTHER:
+    case FrameType::kCrossOriginBackground:
+    case FrameType::kCrossOriginBackgroundExemptSelf:
+    case FrameType::kCrossOriginBackgroundExemptOther:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType."
              "CrossOriginBackground";
-    case FrameType::NONE:
-    case FrameType::DETACHED:
+    case FrameType::kNone:
+    case FrameType::kDetached:
       return "RendererScheduler.ExpectedQueueingTimeByFrameType.Other";
-    case FrameType::COUNT:
+    case FrameType::kCount:
       NOTREACHED();
       return "";
   }
@@ -196,9 +196,9 @@
 void QueueingTimeEstimator::Calculator::UpdateStatusFromTaskQueue(
     MainThreadTaskQueue* queue) {
   current_queue_type_ =
-      queue ? queue->queue_type() : MainThreadTaskQueue::QueueType::OTHER;
+      queue ? queue->queue_type() : MainThreadTaskQueue::QueueType::kOther;
   WebFrameScheduler* scheduler = queue ? queue->GetFrameScheduler() : nullptr;
-  current_frame_type_ = scheduler ? GetFrameType(scheduler) : FrameType::NONE;
+  current_frame_type_ = scheduler ? GetFrameType(scheduler) : FrameType::kNone;
 }
 
 void QueueingTimeEstimator::Calculator::AddQueueingTime(
@@ -225,13 +225,13 @@
     return;
 
   std::map<const char*, base::TimeDelta> delta_by_message;
-  for (int i = 0; i < static_cast<int>(MainThreadTaskQueue::QueueType::COUNT);
+  for (int i = 0; i < static_cast<int>(MainThreadTaskQueue::QueueType::kCount);
        ++i) {
     delta_by_message[GetReportingMessageFromQueueType(
         static_cast<MainThreadTaskQueue::QueueType>(i))] +=
         eqt_by_queue_type_[i];
   }
-  for (int i = 0; i < static_cast<int>(FrameType::COUNT); ++i) {
+  for (int i = 0; i < static_cast<int>(FrameType::kCount); ++i) {
     delta_by_message[GetReportingMessageFromFrameType(
         static_cast<FrameType>(i))] += eqt_by_frame_type_[i];
   }
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.h b/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.h
index 87f0ce6..78889cb 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator.h
@@ -97,15 +97,15 @@
 
     // Variables to split Expected Queueing Time by task queue type.
     std::array<base::TimeDelta,
-               static_cast<int>(MainThreadTaskQueue::QueueType::COUNT)>
+               static_cast<int>(MainThreadTaskQueue::QueueType::kCount)>
         eqt_by_queue_type_;
     MainThreadTaskQueue::QueueType current_queue_type_ =
-        MainThreadTaskQueue::QueueType::OTHER;
+        MainThreadTaskQueue::QueueType::kOther;
 
     // Variables to split Expected Queueing Time by frame type.
-    std::array<base::TimeDelta, static_cast<int>(FrameType::COUNT)>
+    std::array<base::TimeDelta, static_cast<int>(FrameType::kCount)>
         eqt_by_frame_type_;
-    FrameType current_frame_type_ = FrameType::NONE;
+    FrameType current_frame_type_ = FrameType::kNone;
   };
 
   class State {
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator_unittest.cc
index 26e8e03..298873e 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/queueing_time_estimator_unittest.cc
@@ -741,7 +741,7 @@
   // Beginning of window 1.
   time += base::TimeDelta::FromMilliseconds(500);
   scoped_refptr<MainThreadTaskQueueForTest> default_queue(
-      new MainThreadTaskQueueForTest(QueueType::DEFAULT));
+      new MainThreadTaskQueueForTest(QueueType::kDefault));
   estimator.OnTopLevelTaskStarted(time, default_queue.get());
   time += base::TimeDelta::FromMilliseconds(3000);
   estimator.OnTopLevelTaskCompleted(time);
@@ -749,7 +749,7 @@
   time += base::TimeDelta::FromMilliseconds(1500);
   // Beginning of window 2.
   scoped_refptr<MainThreadTaskQueueForTest> default_loading_queue(
-      new MainThreadTaskQueueForTest(QueueType::DEFAULT_LOADING));
+      new MainThreadTaskQueueForTest(QueueType::kDefaultLoading));
   estimator.OnTopLevelTaskStarted(time, default_loading_queue.get());
   time += base::TimeDelta::FromMilliseconds(2000);
   estimator.OnTopLevelTaskCompleted(time);
@@ -771,11 +771,11 @@
 
   time += base::TimeDelta::FromMilliseconds(1000);
   scoped_refptr<MainThreadTaskQueueForTest> frame_loading_queue(
-      new MainThreadTaskQueueForTest(QueueType::FRAME_LOADING));
+      new MainThreadTaskQueueForTest(QueueType::kFrameLoading));
   scoped_refptr<MainThreadTaskQueueForTest> frame_throttleable_queue(
-      new MainThreadTaskQueueForTest(QueueType::FRAME_THROTTLEABLE));
+      new MainThreadTaskQueueForTest(QueueType::kFrameThrottleable));
   scoped_refptr<MainThreadTaskQueueForTest> unthrottled_queue(
-      new MainThreadTaskQueueForTest(QueueType::UNTHROTTLED));
+      new MainThreadTaskQueueForTest(QueueType::kUnthrottled));
   MainThreadTaskQueue* queues_for_thousand[] = {frame_loading_queue.get(),
                                                 frame_throttleable_queue.get(),
                                                 unthrottled_queue.get()};
@@ -787,9 +787,9 @@
 
   // Beginning of window 5.
   scoped_refptr<MainThreadTaskQueueForTest> frame_pausable_queue(
-      new MainThreadTaskQueueForTest(QueueType::FRAME_PAUSABLE));
+      new MainThreadTaskQueueForTest(QueueType::kFramePausable));
   scoped_refptr<MainThreadTaskQueueForTest> compositor_queue(
-      new MainThreadTaskQueueForTest(QueueType::COMPOSITOR));
+      new MainThreadTaskQueueForTest(QueueType::kCompositor));
   MainThreadTaskQueue* queues_for_six_hundred[] = {
       default_queue.get(),        default_loading_queue.get(),
       frame_loading_queue.get(),  frame_throttleable_queue.get(),
@@ -801,18 +801,18 @@
     estimator.OnTopLevelTaskCompleted(time);
   }
 
-  // The following task contributes to "Other" because CONTROL is not a
+  // The following task contributes to "Other" because kControl is not a
   // supported queue type.
   scoped_refptr<MainThreadTaskQueueForTest> control_queue(
-      new MainThreadTaskQueueForTest(QueueType::CONTROL));
+      new MainThreadTaskQueueForTest(QueueType::kControl));
   estimator.OnTopLevelTaskStarted(time, control_queue.get());
   time += base::TimeDelta::FromMilliseconds(300);
   estimator.OnTopLevelTaskCompleted(time);
 
-  // The following task contributes to "Other" because TEST is not a supported
+  // The following task contributes to "Other" because kTest is not a supported
   // queue type.
   scoped_refptr<MainThreadTaskQueueForTest> test_queue(
-      new MainThreadTaskQueueForTest(QueueType::TEST));
+      new MainThreadTaskQueueForTest(QueueType::kTest));
   estimator.OnTopLevelTaskStarted(time, test_queue.get());
   time += base::TimeDelta::FromMilliseconds(300);
   estimator.OnTopLevelTaskCompleted(time);
@@ -823,7 +823,7 @@
   estimator.OnTopLevelTaskCompleted(time);
 
   // End of window 5. Now check the vectors per task queue type.
-  EXPECT_THAT(client.QueueTypeValues(QueueType::DEFAULT),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kDefault),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(900),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(800),
@@ -834,7 +834,7 @@
   TestHistogram("RendererScheduler.ExpectedQueueingTimeByTaskQueueType.Default",
                 5, expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::DEFAULT_LOADING),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kDefaultLoading),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(800),
                                      base::TimeDelta::FromMilliseconds(900),
@@ -845,7 +845,7 @@
       "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.DefaultLoading", 5,
       expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::FRAME_LOADING),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kFrameLoading),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -856,7 +856,7 @@
       "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.FrameLoading", 5,
       expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::FRAME_THROTTLEABLE),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kFrameThrottleable),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -867,7 +867,7 @@
       "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.FrameThrottleable",
       5, expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::FRAME_PAUSABLE),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kFramePausable),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -878,7 +878,7 @@
       "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.FramePausable", 5,
       expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::UNTHROTTLED),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kUnthrottled),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -889,7 +889,7 @@
       "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.Unthrottled", 5,
       expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::COMPOSITOR),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kCompositor),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -900,7 +900,7 @@
       "RendererScheduler.ExpectedQueueingTimeByTaskQueueType.Compositor", 5,
       expected);
 
-  EXPECT_THAT(client.QueueTypeValues(QueueType::OTHER),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kOther),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -916,7 +916,7 @@
                                      base::TimeDelta::FromMilliseconds(1700),
                                      base::TimeDelta::FromMilliseconds(400),
                                      base::TimeDelta::FromMilliseconds(274)};
-  EXPECT_THAT(client.FrameTypeValues(FrameType::NONE),
+  EXPECT_THAT(client.FrameTypeValues(FrameType::kNone),
               ::testing::ElementsAreArray(expected_sums));
   expected = {{274, 1}, {400, 1}, {800, 1}, {900, 1}, {1700, 1}};
   TestHistogram("RendererScheduler.ExpectedQueueingTimeByFrameType.Other", 5,
@@ -935,8 +935,8 @@
 // the first 2000ms from a 3000ms task in a background main frame: 800 EQT for
 // that.
 // Window 4: The remaining 100 EQT for background main frame. Also 1000ms
-// tasks (which contribute 100) for SAME_ORIGIN_VISIBLE, SAME_ORIGIN_HIDDEN,
-// and CROSS_ORIGIN_VISIBLE.
+// tasks (which contribute 100) for kSameOriginVisible, kSameOriginHidden,
+// and kCrossOriginVisible.
 // Window 5: 400 ms tasks (which contribute 16) for each of the buckets except
 // other. Two 300 ms (each contributing 9) and one 800 ms tasks (contributes
 // 64) for the other bucket.
@@ -948,7 +948,7 @@
   estimator.OnTopLevelTaskStarted(time, nullptr);
   estimator.OnTopLevelTaskCompleted(time);
   scoped_refptr<MainThreadTaskQueueForTest> queue1(
-      new MainThreadTaskQueueForTest(QueueType::TEST));
+      new MainThreadTaskQueueForTest(QueueType::kTest));
 
   // Beginning of window 1.
   time += base::TimeDelta::FromMilliseconds(500);
@@ -977,7 +977,7 @@
   estimator.OnTopLevelTaskCompleted(time);
 
   scoped_refptr<MainThreadTaskQueueForTest> queue2(
-      new MainThreadTaskQueueForTest(QueueType::TEST));
+      new MainThreadTaskQueueForTest(QueueType::kTest));
   queue2->SetFrameScheduler(frame2.get());
   time += base::TimeDelta::FromMilliseconds(1000);
   estimator.OnTopLevelTaskStarted(time, queue2.get());
@@ -1093,7 +1093,7 @@
   estimator.OnTopLevelTaskCompleted(time);
 
   // End of window 5. Now check the vectors per frame type.
-  EXPECT_THAT(client.FrameTypeValues(FrameType::MAIN_FRAME_BACKGROUND),
+  EXPECT_THAT(client.FrameTypeValues(FrameType::kMainFrameBackground),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(900),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(800),
@@ -1105,7 +1105,7 @@
       "RendererScheduler.ExpectedQueueingTimeByFrameType.MainFrameBackground",
       5, expected);
 
-  EXPECT_THAT(client.FrameTypeValues(FrameType::MAIN_FRAME_VISIBLE),
+  EXPECT_THAT(client.FrameTypeValues(FrameType::kMainFrameVisible),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(800),
                                      base::TimeDelta::FromMilliseconds(900),
@@ -1121,11 +1121,11 @@
     std::string name;
   };
   FrameExpectation three_expected[] = {
-      {FrameType::SAME_ORIGIN_VISIBLE,
+      {FrameType::kSameOriginVisible,
        "RendererScheduler.ExpectedQueueingTimeByFrameType.SameOriginVisible"},
-      {FrameType::SAME_ORIGIN_HIDDEN,
+      {FrameType::kSameOriginHidden,
        "RendererScheduler.ExpectedQueueingTimeByFrameType.SameOriginHidden"},
-      {FrameType::CROSS_ORIGIN_VISIBLE,
+      {FrameType::kCrossOriginVisible,
        "RendererScheduler.ExpectedQueueingTimeByFrameType.CrossOriginVisible"},
   };
   for (const auto& frame_expectation : three_expected) {
@@ -1140,15 +1140,15 @@
   }
 
   FrameExpectation more_expected[] = {
-      {FrameType::MAIN_FRAME_HIDDEN,
+      {FrameType::kMainFrameHidden,
        "RendererScheduler.ExpectedQueueingTimeByFrameType."
        "MainFrameHidden"},
-      {FrameType::SAME_ORIGIN_BACKGROUND,
+      {FrameType::kSameOriginBackground,
        "RendererScheduler.ExpectedQueueingTimeByFrameType."
        "SameOriginBackground"},
-      {FrameType::CROSS_ORIGIN_HIDDEN,
+      {FrameType::kCrossOriginHidden,
        "RendererScheduler.ExpectedQueueingTimeByFrameType.CrossOriginHidden"},
-      {FrameType::CROSS_ORIGIN_BACKGROUND,
+      {FrameType::kCrossOriginBackground,
        "RendererScheduler.ExpectedQueueingTimeByFrameType."
        "CrossOriginBackground"}};
   for (const auto& frame_expectation : more_expected) {
@@ -1162,7 +1162,7 @@
     TestHistogram(frame_expectation.name, 5, expected);
   }
 
-  EXPECT_THAT(client.FrameTypeValues(FrameType::NONE),
+  EXPECT_THAT(client.FrameTypeValues(FrameType::kNone),
               ::testing::ElementsAre(base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
                                      base::TimeDelta::FromMilliseconds(0),
@@ -1178,7 +1178,7 @@
                                      base::TimeDelta::FromMilliseconds(1700),
                                      base::TimeDelta::FromMilliseconds(400),
                                      base::TimeDelta::FromMilliseconds(226)};
-  EXPECT_THAT(client.QueueTypeValues(QueueType::OTHER),
+  EXPECT_THAT(client.QueueTypeValues(QueueType::kOther),
               ::testing::ElementsAreArray(expected_sums));
   expected = {{226, 1}, {400, 1}, {800, 1}, {900, 1}, {1700, 1}};
   TestHistogram("RendererScheduler.ExpectedQueueingTimeByTaskQueueType.Other",
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.cc
index 165eb42..89d2e4a7d 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.cc
@@ -22,7 +22,7 @@
   MAIN_THREAD_LOAD_METRIC_NAME ".Extension"
 #define PER_FRAME_TYPE_METRIC_NAME "RendererScheduler.TaskDurationPerFrameType2"
 
-enum class MainThreadTaskLoadState { LOW, HIGH, UNKNOWN };
+enum class MainThreadTaskLoadState { kLow, kHigh, kUnknown };
 
 namespace {
 
@@ -37,72 +37,72 @@
     base::TimeDelta::FromMinutes(3);
 
 enum class FrameThrottlingState {
-  VISIBLE = 0,
-  VISIBLE_SERVICE = 1,
-  HIDDEN = 2,
-  HIDDEN_SERVICE = 3,
-  BACKGROUND = 4,
-  BACKGROUND_EXEMPT_SELF = 5,
-  BACKGROUND_EXEMPT_OTHER = 6,
+  kVisible = 0,
+  kVisibleService = 1,
+  kHidden = 2,
+  kHiddenService = 3,
+  kBackground = 4,
+  kBackgroundExemptSelf = 5,
+  kBackgroundExemptOther = 6,
 
-  COUNT = 7
+  kCount = 7
 };
 
 enum class FrameOriginState {
-  MAIN_FRAME = 0,
-  SAME_ORIGIN = 1,
-  CROSS_ORIGIN = 2,
+  kMainFrame = 0,
+  kSameOrigin = 1,
+  kCrossOrigin = 2,
 
-  COUNT = 3
+  kCount = 3
 };
 
 FrameThrottlingState GetFrameThrottlingState(
     const WebFrameScheduler& frame_scheduler) {
   if (frame_scheduler.IsPageVisible()) {
     if (frame_scheduler.IsFrameVisible())
-      return FrameThrottlingState::VISIBLE;
-    return FrameThrottlingState::HIDDEN;
+      return FrameThrottlingState::kVisible;
+    return FrameThrottlingState::kHidden;
   }
 
   WebViewScheduler* web_view_scheduler = frame_scheduler.GetWebViewScheduler();
   if (web_view_scheduler && web_view_scheduler->IsPlayingAudio()) {
     if (frame_scheduler.IsFrameVisible())
-      return FrameThrottlingState::VISIBLE_SERVICE;
-    return FrameThrottlingState::HIDDEN_SERVICE;
+      return FrameThrottlingState::kVisibleService;
+    return FrameThrottlingState::kHiddenService;
   }
 
   if (frame_scheduler.IsExemptFromBudgetBasedThrottling())
-    return FrameThrottlingState::BACKGROUND_EXEMPT_SELF;
+    return FrameThrottlingState::kBackgroundExemptSelf;
 
   if (web_view_scheduler &&
       web_view_scheduler->IsExemptFromBudgetBasedThrottling())
-    return FrameThrottlingState::BACKGROUND_EXEMPT_OTHER;
+    return FrameThrottlingState::kBackgroundExemptOther;
 
-  return FrameThrottlingState::BACKGROUND;
+  return FrameThrottlingState::kBackground;
 }
 
 FrameOriginState GetFrameOriginState(const WebFrameScheduler& frame_scheduler) {
   if (frame_scheduler.GetFrameType() ==
       WebFrameScheduler::FrameType::kMainFrame) {
-    return FrameOriginState::MAIN_FRAME;
+    return FrameOriginState::kMainFrame;
   }
   if (frame_scheduler.IsCrossOrigin())
-    return FrameOriginState::CROSS_ORIGIN;
-  return FrameOriginState::SAME_ORIGIN;
+    return FrameOriginState::kCrossOrigin;
+  return FrameOriginState::kSameOrigin;
 }
 
 }  // namespace
 
 FrameType GetFrameType(WebFrameScheduler* frame_scheduler) {
   if (!frame_scheduler)
-    return FrameType::NONE;
+    return FrameType::kNone;
   FrameThrottlingState throttling_state =
       GetFrameThrottlingState(*frame_scheduler);
   FrameOriginState origin_state = GetFrameOriginState(*frame_scheduler);
   return static_cast<FrameType>(
-      static_cast<int>(FrameType::SPECIAL_CASES_COUNT) +
+      static_cast<int>(FrameType::kSpecialCasesCount) +
       static_cast<int>(origin_state) *
-          static_cast<int>(FrameThrottlingState::COUNT) +
+          static_cast<int>(FrameThrottlingState::kCount) +
       static_cast<int>(throttling_state));
 }
 
@@ -156,7 +156,7 @@
       hidden_music_task_duration_reporter(TASK_DURATION_METRIC_NAME
                                           ".HiddenMusic"),
       frame_type_duration_reporter(PER_FRAME_TYPE_METRIC_NAME),
-      main_thread_task_load_state(MainThreadTaskLoadState::UNKNOWN) {
+      main_thread_task_load_state(MainThreadTaskLoadState::kUnknown) {
   main_thread_load_tracker.Resume(now);
   if (renderer_backgrounded) {
     background_main_thread_load_tracker.Resume(now);
@@ -228,36 +228,36 @@
 
   UMA_HISTOGRAM_ENUMERATION(
       TASK_COUNT_METRIC_NAME, static_cast<int>(queue_type),
-      static_cast<int>(MainThreadTaskQueue::QueueType::COUNT));
+      static_cast<int>(MainThreadTaskQueue::QueueType::kCount));
 
   if (duration >= base::TimeDelta::FromMilliseconds(16)) {
     UMA_HISTOGRAM_ENUMERATION(
         TASK_COUNT_METRIC_NAME ".LongerThan16ms", static_cast<int>(queue_type),
-        static_cast<int>(MainThreadTaskQueue::QueueType::COUNT));
+        static_cast<int>(MainThreadTaskQueue::QueueType::kCount));
   }
 
   if (duration >= base::TimeDelta::FromMilliseconds(50)) {
     UMA_HISTOGRAM_ENUMERATION(
         TASK_COUNT_METRIC_NAME ".LongerThan50ms", static_cast<int>(queue_type),
-        static_cast<int>(MainThreadTaskQueue::QueueType::COUNT));
+        static_cast<int>(MainThreadTaskQueue::QueueType::kCount));
   }
 
   if (duration >= base::TimeDelta::FromMilliseconds(100)) {
     UMA_HISTOGRAM_ENUMERATION(
         TASK_COUNT_METRIC_NAME ".LongerThan100ms", static_cast<int>(queue_type),
-        static_cast<int>(MainThreadTaskQueue::QueueType::COUNT));
+        static_cast<int>(MainThreadTaskQueue::QueueType::kCount));
   }
 
   if (duration >= base::TimeDelta::FromMilliseconds(150)) {
     UMA_HISTOGRAM_ENUMERATION(
         TASK_COUNT_METRIC_NAME ".LongerThan150ms", static_cast<int>(queue_type),
-        static_cast<int>(MainThreadTaskQueue::QueueType::COUNT));
+        static_cast<int>(MainThreadTaskQueue::QueueType::kCount));
   }
 
   if (duration >= base::TimeDelta::FromSeconds(1)) {
     UMA_HISTOGRAM_ENUMERATION(
         TASK_COUNT_METRIC_NAME ".LongerThan1s", static_cast<int>(queue_type),
-        static_cast<int>(MainThreadTaskQueue::QueueType::COUNT));
+        static_cast<int>(MainThreadTaskQueue::QueueType::kCount));
   }
 
   task_duration_reporter.RecordTask(queue_type, duration);
@@ -366,13 +366,13 @@
 
     // Avoid sending duplicate IPCs when the state doesn't change.
     if (load_percentage <= main_thread_task_load_low_threshold &&
-        main_thread_task_load_state != MainThreadTaskLoadState::LOW) {
+        main_thread_task_load_state != MainThreadTaskLoadState::kLow) {
       RendererResourceCoordinator::Get().SetMainThreadTaskLoadIsLow(true);
-      main_thread_task_load_state = MainThreadTaskLoadState::LOW;
+      main_thread_task_load_state = MainThreadTaskLoadState::kLow;
     } else if (load_percentage > main_thread_task_load_low_threshold &&
-               main_thread_task_load_state != MainThreadTaskLoadState::HIGH) {
+               main_thread_task_load_state != MainThreadTaskLoadState::kHigh) {
       RendererResourceCoordinator::Get().SetMainThreadTaskLoadIsLow(false);
-      main_thread_task_load_state = MainThreadTaskLoadState::HIGH;
+      main_thread_task_load_state = MainThreadTaskLoadState::kHigh;
     }
   }
 
@@ -454,7 +454,7 @@
 void RendererMetricsHelper::RecordBackgroundedTransition(
     BackgroundedRendererTransition transition) {
   UMA_HISTOGRAM_ENUMERATION("RendererScheduler.BackgroundedRendererTransition",
-                            transition, BackgroundedRendererTransition::COUNT);
+                            transition, BackgroundedRendererTransition::kCount);
 }
 }  // namespace scheduler
 }  // namespace blink
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.h
index d46c6314..44447a7 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper.h
@@ -29,7 +29,7 @@
 // There are three main states:
 // VISIBLE describes frames which are visible to the user (both page and frame
 // are visible).
-// Without this service frame would have had BACKGROUNDED state.
+// Without this service frame would have had kBackgrounded state.
 // HIDDEN describes frames which are out of viewport but the page is visible
 // to the user.
 // BACKGROUND describes frames in background pages.
@@ -42,66 +42,67 @@
 // BACKGROUND_EXEMPT_SELF describes background frames which are
 // exempted from background throttling due to a special conditions being met
 // for this frame.
-// BACKGROUND_EXEMPT_OTHER describes background frames which are exempted from
+// BACKGROUND_EXEMPT_kOther describes background frames which are exempted from
 // background throttling due to other frames granting an exemption for
 // the whole page.
 //
 // Note that all these seven states are disjoint, e.g, when calculating
 // a metric for background BACKGROUND, BACKGROUND_EXEMPT_SELF and
-// BACKGROUND_EXEMPT_OTHER should be added together.
+// BACKGROUND_EXEMPT_kOther should be added together.
 enum class FrameType {
   // Used to describe a task queue which doesn't have a frame associated
   // (e.g. global task queue).
-  NONE = 0,
+  kNone = 0,
 
   // This frame was detached and does not have origin or visibility status
   // anymore.
-  DETACHED = 1,
+  kDetached = 1,
 
-  SPECIAL_CASES_COUNT = 2,
+  kSpecialCasesCount = 2,
 
-  MAIN_FRAME_VISIBLE = 2,
-  MAIN_FRAME_VISIBLE_SERVICE = 3,
-  MAIN_FRAME_HIDDEN = 4,
-  MAIN_FRAME_HIDDEN_SERVICE = 5,
-  MAIN_FRAME_BACKGROUND = 6,
-  MAIN_FRAME_BACKGROUND_EXEMPT_SELF = 7,
-  MAIN_FRAME_BACKGROUND_EXEMPT_OTHER = 8,
+  kMainFrameVisible = 2,
+  kMainFrameVisibleService = 3,
+  kMainFrameHidden = 4,
+  kMainFrameHiddenService = 5,
+  kMainFrameBackground = 6,
+  kMainFrameBackgroundExemptSelf = 7,
+  kMainFrameBackgroundExemptOther = 8,
 
-  SAME_ORIGIN_VISIBLE = 9,
-  SAME_ORIGIN_VISIBLE_SERVICE = 10,
-  SAME_ORIGIN_HIDDEN = 11,
-  SAME_ORIGIN_HIDDEN_SERVICE = 12,
-  SAME_ORIGIN_BACKGROUND = 13,
-  SAME_ORIGIN_BACKGROUND_EXEMPT_SELF = 14,
-  SAME_ORIGIN_BACKGROUND_EXEMPT_OTHER = 15,
+  kSameOriginVisible = 9,
+  kSameOriginVisibleService = 10,
+  kSameOriginHidden = 11,
+  kSameOriginHiddenService = 12,
+  kSameOriginBackground = 13,
+  kSameOriginBackgroundExemptSelf = 14,
+  kSameOriginBackgroundExemptOther = 15,
 
-  CROSS_ORIGIN_VISIBLE = 16,
-  CROSS_ORIGIN_VISIBLE_SERVICE = 17,
-  CROSS_ORIGIN_HIDDEN = 18,
-  CROSS_ORIGIN_HIDDEN_SERVICE = 19,
-  CROSS_ORIGIN_BACKGROUND = 20,
-  CROSS_ORIGIN_BACKGROUND_EXEMPT_SELF = 21,
-  CROSS_ORIGIN_BACKGROUND_EXEMPT_OTHER = 22,
+  kCrossOriginVisible = 16,
+  kCrossOriginVisibleService = 17,
+  kCrossOriginHidden = 18,
+  kCrossOriginHiddenService = 19,
+  kCrossOriginBackground = 20,
+  kCrossOriginBackgroundExemptSelf = 21,
+  kCrossOriginBackgroundExemptOther = 22,
 
-  COUNT = 23
+  kCount = 23
 };
 
 // This enum is used for histogram and should not be renumbered.
 // It tracks the following possible transitions:
-// -> BACKGROUNDED (-> [STOPPED_* -> RESUMED])? -> FOREGROUNDED
+// -> kBackgrounded (-> [STOPPED_* -> kResumed])? -> kForegrounded
 enum class BackgroundedRendererTransition {
   // Renderer is backgrounded
-  BACKGROUNDED = 0,
+  kBackgrounded = 0,
   // Renderer is stopped after being backgrounded for a while
-  STOPPED_AFTER_DELAY = 1,
+  kStoppedAfterDelay = 1,
   // Renderer is stopped due to critical resources, reserved for future use.
-  STOPPED_DUE_TO_CRITICAL_RESOURCES = 2,
+  kStoppedDueToCriticalResources = 2,
   // Renderer is resumed after being stopped
-  RESUMED = 3,
+  kResumed = 3,
   // Renderer is foregrounded
-  FOREGROUNDED = 4,
-  COUNT = 5
+  kForegrounded = 4,
+
+  kCount = 5
 };
 
 PLATFORM_EXPORT FrameType GetFrameType(WebFrameScheduler* frame_scheduler);
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper_unittest.cc
index 974d8d9c..75c01cb 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_metrics_helper_unittest.cc
@@ -78,71 +78,71 @@
 };
 
 TEST_F(RendererMetricsHelperTest, Metrics) {
-  // QueueType::DEFAULT is checking sub-millisecond task aggregation,
+  // QueueType::kDefault is checking sub-millisecond task aggregation,
   // FRAME_* tasks are checking normal task aggregation and other
   // queue types have a single task.
-  RunTask(QueueType::DEFAULT, Milliseconds(1),
+  RunTask(QueueType::kDefault, Milliseconds(1),
           base::TimeDelta::FromMicroseconds(700));
-  RunTask(QueueType::DEFAULT, Milliseconds(2),
+  RunTask(QueueType::kDefault, Milliseconds(2),
           base::TimeDelta::FromMicroseconds(700));
-  RunTask(QueueType::DEFAULT, Milliseconds(3),
+  RunTask(QueueType::kDefault, Milliseconds(3),
           base::TimeDelta::FromMicroseconds(700));
 
-  RunTask(QueueType::DEFAULT_LOADING, Milliseconds(200),
+  RunTask(QueueType::kDefaultLoading, Milliseconds(200),
           base::TimeDelta::FromMilliseconds(20));
-  RunTask(QueueType::CONTROL, Milliseconds(400),
+  RunTask(QueueType::kControl, Milliseconds(400),
           base::TimeDelta::FromMilliseconds(30));
-  RunTask(QueueType::DEFAULT_TIMER, Milliseconds(600),
+  RunTask(QueueType::kDefaultTimer, Milliseconds(600),
           base::TimeDelta::FromMilliseconds(5));
-  RunTask(QueueType::FRAME_LOADING, Milliseconds(800),
+  RunTask(QueueType::kFrameLoading, Milliseconds(800),
           base::TimeDelta::FromMilliseconds(70));
-  RunTask(QueueType::FRAME_PAUSABLE, Milliseconds(1000),
+  RunTask(QueueType::kFramePausable, Milliseconds(1000),
           base::TimeDelta::FromMilliseconds(20));
-  RunTask(QueueType::COMPOSITOR, Milliseconds(1200),
+  RunTask(QueueType::kCompositor, Milliseconds(1200),
           base::TimeDelta::FromMilliseconds(25));
-  RunTask(QueueType::TEST, Milliseconds(1600),
+  RunTask(QueueType::kTest, Milliseconds(1600),
           base::TimeDelta::FromMilliseconds(85));
 
   scheduler_->SetRendererBackgrounded(true);
 
-  RunTask(QueueType::CONTROL, Milliseconds(2000),
+  RunTask(QueueType::kControl, Milliseconds(2000),
           base::TimeDelta::FromMilliseconds(25));
-  RunTask(QueueType::FRAME_THROTTLEABLE, Milliseconds(2600),
+  RunTask(QueueType::kFrameThrottleable, Milliseconds(2600),
           base::TimeDelta::FromMilliseconds(175));
-  RunTask(QueueType::UNTHROTTLED, Milliseconds(2800),
+  RunTask(QueueType::kUnthrottled, Milliseconds(2800),
           base::TimeDelta::FromMilliseconds(25));
-  RunTask(QueueType::FRAME_LOADING, Milliseconds(3000),
+  RunTask(QueueType::kFrameLoading, Milliseconds(3000),
           base::TimeDelta::FromMilliseconds(35));
-  RunTask(QueueType::FRAME_THROTTLEABLE, Milliseconds(3200),
+  RunTask(QueueType::kFrameThrottleable, Milliseconds(3200),
           base::TimeDelta::FromMilliseconds(5));
-  RunTask(QueueType::COMPOSITOR, Milliseconds(3400),
+  RunTask(QueueType::kCompositor, Milliseconds(3400),
           base::TimeDelta::FromMilliseconds(20));
-  RunTask(QueueType::IDLE, Milliseconds(3600),
+  RunTask(QueueType::kIdle, Milliseconds(3600),
           base::TimeDelta::FromMilliseconds(50));
-  RunTask(QueueType::FRAME_LOADING_CONTROL, Milliseconds(4000),
+  RunTask(QueueType::kFrameLoading_kControl, Milliseconds(4000),
           base::TimeDelta::FromMilliseconds(5));
-  RunTask(QueueType::CONTROL, Milliseconds(4200),
+  RunTask(QueueType::kControl, Milliseconds(4200),
           base::TimeDelta::FromMilliseconds(20));
-  RunTask(QueueType::FRAME_THROTTLEABLE, Milliseconds(4400),
+  RunTask(QueueType::kFrameThrottleable, Milliseconds(4400),
           base::TimeDelta::FromMilliseconds(115));
-  RunTask(QueueType::FRAME_PAUSABLE, Milliseconds(4600),
+  RunTask(QueueType::kFramePausable, Milliseconds(4600),
           base::TimeDelta::FromMilliseconds(175));
-  RunTask(QueueType::IDLE, Milliseconds(5000),
+  RunTask(QueueType::kIdle, Milliseconds(5000),
           base::TimeDelta::FromMilliseconds(1600));
 
   std::vector<base::Bucket> expected_samples = {
-      {static_cast<int>(QueueType::CONTROL), 75},
-      {static_cast<int>(QueueType::DEFAULT), 2},
-      {static_cast<int>(QueueType::DEFAULT_LOADING), 20},
-      {static_cast<int>(QueueType::DEFAULT_TIMER), 5},
-      {static_cast<int>(QueueType::UNTHROTTLED), 25},
-      {static_cast<int>(QueueType::FRAME_LOADING), 105},
-      {static_cast<int>(QueueType::COMPOSITOR), 45},
-      {static_cast<int>(QueueType::IDLE), 1650},
-      {static_cast<int>(QueueType::TEST), 85},
-      {static_cast<int>(QueueType::FRAME_LOADING_CONTROL), 5},
-      {static_cast<int>(QueueType::FRAME_THROTTLEABLE), 295},
-      {static_cast<int>(QueueType::FRAME_PAUSABLE), 195}};
+      {static_cast<int>(QueueType::kControl), 75},
+      {static_cast<int>(QueueType::kDefault), 2},
+      {static_cast<int>(QueueType::kDefaultLoading), 20},
+      {static_cast<int>(QueueType::kDefaultTimer), 5},
+      {static_cast<int>(QueueType::kUnthrottled), 25},
+      {static_cast<int>(QueueType::kFrameLoading), 105},
+      {static_cast<int>(QueueType::kCompositor), 45},
+      {static_cast<int>(QueueType::kIdle), 1650},
+      {static_cast<int>(QueueType::kTest), 85},
+      {static_cast<int>(QueueType::kFrameLoading_kControl), 5},
+      {static_cast<int>(QueueType::kFrameThrottleable), 295},
+      {static_cast<int>(QueueType::kFramePausable), 195}};
   EXPECT_THAT(histogram_tester_->GetAllSamples(
                   "RendererScheduler.TaskDurationPerQueueType2"),
               testing::ContainerEq(expected_samples));
@@ -150,31 +150,31 @@
   EXPECT_THAT(histogram_tester_->GetAllSamples(
                   "RendererScheduler.TaskDurationPerQueueType2.Foreground"),
               UnorderedElementsAre(
-                  Bucket(static_cast<int>(QueueType::CONTROL), 30),
-                  Bucket(static_cast<int>(QueueType::DEFAULT), 2),
-                  Bucket(static_cast<int>(QueueType::DEFAULT_LOADING), 20),
-                  Bucket(static_cast<int>(QueueType::DEFAULT_TIMER), 5),
-                  Bucket(static_cast<int>(QueueType::FRAME_LOADING), 70),
-                  Bucket(static_cast<int>(QueueType::COMPOSITOR), 25),
-                  Bucket(static_cast<int>(QueueType::TEST), 85),
-                  Bucket(static_cast<int>(QueueType::FRAME_PAUSABLE), 20)));
+                  Bucket(static_cast<int>(QueueType::kControl), 30),
+                  Bucket(static_cast<int>(QueueType::kDefault), 2),
+                  Bucket(static_cast<int>(QueueType::kDefaultLoading), 20),
+                  Bucket(static_cast<int>(QueueType::kDefaultTimer), 5),
+                  Bucket(static_cast<int>(QueueType::kFrameLoading), 70),
+                  Bucket(static_cast<int>(QueueType::kCompositor), 25),
+                  Bucket(static_cast<int>(QueueType::kTest), 85),
+                  Bucket(static_cast<int>(QueueType::kFramePausable), 20)));
 
   EXPECT_THAT(
       histogram_tester_->GetAllSamples(
           "RendererScheduler.TaskDurationPerQueueType2.Background"),
       UnorderedElementsAre(
-          Bucket(static_cast<int>(QueueType::CONTROL), 45),
-          Bucket(static_cast<int>(QueueType::UNTHROTTLED), 25),
-          Bucket(static_cast<int>(QueueType::FRAME_LOADING), 35),
-          Bucket(static_cast<int>(QueueType::FRAME_THROTTLEABLE), 295),
-          Bucket(static_cast<int>(QueueType::FRAME_PAUSABLE), 175),
-          Bucket(static_cast<int>(QueueType::COMPOSITOR), 20),
-          Bucket(static_cast<int>(QueueType::IDLE), 1650),
-          Bucket(static_cast<int>(QueueType::FRAME_LOADING_CONTROL), 5)));
+          Bucket(static_cast<int>(QueueType::kControl), 45),
+          Bucket(static_cast<int>(QueueType::kUnthrottled), 25),
+          Bucket(static_cast<int>(QueueType::kFrameLoading), 35),
+          Bucket(static_cast<int>(QueueType::kFrameThrottleable), 295),
+          Bucket(static_cast<int>(QueueType::kFramePausable), 175),
+          Bucket(static_cast<int>(QueueType::kCompositor), 20),
+          Bucket(static_cast<int>(QueueType::kIdle), 1650),
+          Bucket(static_cast<int>(QueueType::kFrameLoading_kControl), 5)));
 }
 
 TEST_F(RendererMetricsHelperTest, GetFrameTypeTest) {
-  DCHECK_EQ(GetFrameType(nullptr), FrameType::NONE);
+  DCHECK_EQ(GetFrameType(nullptr), FrameType::kNone);
 
   std::unique_ptr<FakeWebFrameScheduler> frame1 =
       FakeWebFrameScheduler::Builder()
@@ -182,14 +182,14 @@
           .SetIsPageVisible(true)
           .SetIsFrameVisible(true)
           .Build();
-  EXPECT_EQ(GetFrameType(frame1.get()), FrameType::MAIN_FRAME_VISIBLE);
+  EXPECT_EQ(GetFrameType(frame1.get()), FrameType::kMainFrameVisible);
 
   std::unique_ptr<FakeWebFrameScheduler> frame2 =
       FakeWebFrameScheduler::Builder()
           .SetFrameType(WebFrameScheduler::FrameType::kSubframe)
           .SetIsPageVisible(true)
           .Build();
-  EXPECT_EQ(GetFrameType(frame2.get()), FrameType::SAME_ORIGIN_HIDDEN);
+  EXPECT_EQ(GetFrameType(frame2.get()), FrameType::kSameOriginHidden);
 
   std::unique_ptr<FakeWebFrameScheduler> frame3 =
       FakeWebFrameScheduler::Builder()
@@ -197,13 +197,13 @@
           .SetIsPageVisible(true)
           .SetIsCrossOrigin(true)
           .Build();
-  EXPECT_EQ(GetFrameType(frame3.get()), FrameType::CROSS_ORIGIN_HIDDEN);
+  EXPECT_EQ(GetFrameType(frame3.get()), FrameType::kCrossOriginHidden);
 
   std::unique_ptr<FakeWebFrameScheduler> frame4 =
       FakeWebFrameScheduler::Builder()
           .SetFrameType(WebFrameScheduler::FrameType::kSubframe)
           .Build();
-  EXPECT_EQ(GetFrameType(frame4.get()), FrameType::SAME_ORIGIN_BACKGROUND);
+  EXPECT_EQ(GetFrameType(frame4.get()), FrameType::kSameOriginBackground);
 
   std::unique_ptr<FakeWebFrameScheduler> frame5 =
       FakeWebFrameScheduler::Builder()
@@ -211,7 +211,7 @@
           .SetIsExemptFromThrottling(true)
           .Build();
   DCHECK_EQ(GetFrameType(frame5.get()),
-            FrameType::MAIN_FRAME_BACKGROUND_EXEMPT_SELF);
+            FrameType::kMainFrameBackgroundExemptSelf);
 
   std::unique_ptr<FakeWebViewScheduler> view1 =
       FakeWebViewScheduler::Builder().SetIsPlayingAudio(true).Build();
@@ -222,7 +222,7 @@
           .SetIsFrameVisible(true)
           .SetFrameType(WebFrameScheduler::FrameType::kSubframe)
           .Build();
-  DCHECK_EQ(GetFrameType(frame6.get()), FrameType::SAME_ORIGIN_VISIBLE_SERVICE);
+  DCHECK_EQ(GetFrameType(frame6.get()), FrameType::kSameOriginVisibleService);
 
   std::unique_ptr<FakeWebFrameScheduler> frame7 =
       FakeWebFrameScheduler::Builder()
@@ -230,7 +230,7 @@
           .SetIsCrossOrigin(true)
           .SetFrameType(WebFrameScheduler::FrameType::kSubframe)
           .Build();
-  DCHECK_EQ(GetFrameType(frame7.get()), FrameType::CROSS_ORIGIN_HIDDEN_SERVICE);
+  DCHECK_EQ(GetFrameType(frame7.get()), FrameType::kCrossOriginHiddenService);
 
   std::unique_ptr<FakeWebViewScheduler> view2 =
       FakeWebViewScheduler::Builder().SetIsThrottlingExempt(true).Build();
@@ -241,7 +241,7 @@
           .SetFrameType(WebFrameScheduler::FrameType::kMainFrame)
           .Build();
   DCHECK_EQ(GetFrameType(frame8.get()),
-            FrameType::MAIN_FRAME_BACKGROUND_EXEMPT_OTHER);
+            FrameType::kMainFrameBackgroundExemptOther);
 }
 
 TEST_F(RendererMetricsHelperTest, BackgroundedRendererTransition) {
@@ -252,37 +252,36 @@
   EXPECT_THAT(histogram_tester_->GetAllSamples(
                   "RendererScheduler.BackgroundedRendererTransition"),
               UnorderedElementsAre(
-                  Bucket(static_cast<int>(Transition::BACKGROUNDED), 1)));
+                  Bucket(static_cast<int>(Transition::kBackgrounded), 1)));
 
   scheduler_->SetRendererBackgrounded(false);
   EXPECT_THAT(histogram_tester_->GetAllSamples(
                   "RendererScheduler.BackgroundedRendererTransition"),
               UnorderedElementsAre(
-                  Bucket(static_cast<int>(Transition::BACKGROUNDED), 1),
-                  Bucket(static_cast<int>(Transition::FOREGROUNDED), 1)));
+                  Bucket(static_cast<int>(Transition::kBackgrounded), 1),
+                  Bucket(static_cast<int>(Transition::kForegrounded), 1)));
 
   scheduler_->SetRendererBackgrounded(true);
   EXPECT_THAT(histogram_tester_->GetAllSamples(
                   "RendererScheduler.BackgroundedRendererTransition"),
               UnorderedElementsAre(
-                  Bucket(static_cast<int>(Transition::BACKGROUNDED), 2),
-                  Bucket(static_cast<int>(Transition::FOREGROUNDED), 1)));
+                  Bucket(static_cast<int>(Transition::kBackgrounded), 2),
+                  Bucket(static_cast<int>(Transition::kForegrounded), 1)));
 
   // Waste 5+ minutes so that the delayed stop is triggered
-  RunTask(QueueType::DEFAULT, Milliseconds(1),
+  RunTask(QueueType::kDefault, Milliseconds(1),
           base::TimeDelta::FromSeconds(5 * 61));
   // Firing ForceUpdatePolicy multiple times to make sure that the metric is
   // only recorded upon an actual change.
   ForceUpdatePolicy();
   ForceUpdatePolicy();
   ForceUpdatePolicy();
-  EXPECT_THAT(
-      histogram_tester_->GetAllSamples(
-          "RendererScheduler.BackgroundedRendererTransition"),
-      UnorderedElementsAre(
-          Bucket(static_cast<int>(Transition::BACKGROUNDED), 2),
-          Bucket(static_cast<int>(Transition::FOREGROUNDED), 1),
-          Bucket(static_cast<int>(Transition::STOPPED_AFTER_DELAY), 1)));
+  EXPECT_THAT(histogram_tester_->GetAllSamples(
+                  "RendererScheduler.BackgroundedRendererTransition"),
+              UnorderedElementsAre(
+                  Bucket(static_cast<int>(Transition::kBackgrounded), 2),
+                  Bucket(static_cast<int>(Transition::kForegrounded), 1),
+                  Bucket(static_cast<int>(Transition::kStoppedAfterDelay), 1)));
 
   scheduler_->SetRendererBackgrounded(false);
   ForceUpdatePolicy();
@@ -290,10 +289,10 @@
   EXPECT_THAT(histogram_tester_->GetAllSamples(
                   "RendererScheduler.BackgroundedRendererTransition"),
               UnorderedElementsAre(
-                  Bucket(static_cast<int>(Transition::BACKGROUNDED), 2),
-                  Bucket(static_cast<int>(Transition::FOREGROUNDED), 2),
-                  Bucket(static_cast<int>(Transition::STOPPED_AFTER_DELAY), 1),
-                  Bucket(static_cast<int>(Transition::RESUMED), 1)));
+                  Bucket(static_cast<int>(Transition::kBackgrounded), 2),
+                  Bucket(static_cast<int>(Transition::kForegrounded), 2),
+                  Bucket(static_cast<int>(Transition::kStoppedAfterDelay), 1),
+                  Bucket(static_cast<int>(Transition::kResumed), 1)));
 }
 
 // TODO(crbug.com/754656): Add tests for NthMinute and AfterNthMinute
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
index ed2a291..dce4cee 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
@@ -90,14 +90,14 @@
           "RendererSchedulerIdlePeriod",
           base::TimeDelta(),
           helper_.NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-              MainThreadTaskQueue::QueueType::IDLE))),
+              MainThreadTaskQueue::QueueType::kIdle))),
       idle_canceled_delayed_task_sweeper_(&helper_,
                                           idle_helper_.IdleTaskRunner()),
       render_widget_scheduler_signals_(this),
       control_task_queue_(helper_.ControlMainThreadTaskQueue()),
       compositor_task_queue_(
           helper_.NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-                                   MainThreadTaskQueue::QueueType::COMPOSITOR)
+                                   MainThreadTaskQueue::QueueType::kCompositor)
                                    .SetShouldMonitorQuiescence(true))),
       compositor_task_queue_enabled_voter_(
           compositor_task_queue_->CreateQueueEnabledVoter()),
@@ -128,13 +128,13 @@
                      compositor_task_queue_->CreateQueueEnabledVoter()));
 
   default_loading_task_queue_ =
-      NewLoadingTaskQueue(MainThreadTaskQueue::QueueType::DEFAULT_LOADING);
+      NewLoadingTaskQueue(MainThreadTaskQueue::QueueType::kDefaultLoading);
   default_timer_task_queue_ =
-      NewTimerTaskQueue(MainThreadTaskQueue::QueueType::DEFAULT_TIMER);
+      NewTimerTaskQueue(MainThreadTaskQueue::QueueType::kDefaultTimer);
   v8_task_queue_ = NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-      MainThreadTaskQueue::QueueType::V8));
+      MainThreadTaskQueue::QueueType::kV8));
   ipc_task_queue_ = NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-      MainThreadTaskQueue::QueueType::IPC));
+      MainThreadTaskQueue::QueueType::kIPC));
 
   TRACE_EVENT_OBJECT_CREATED_WITH_ID(
       TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"), "RendererScheduler",
@@ -169,10 +169,10 @@
   for (auto& pair : task_runners_) {
     TaskCostEstimator* observer = nullptr;
     switch (pair.first->queue_class()) {
-      case MainThreadTaskQueue::QueueClass::LOADING:
+      case MainThreadTaskQueue::QueueClass::kLoading:
         observer = &main_thread_only().loading_task_cost_estimator;
         break;
-      case MainThreadTaskQueue::QueueClass::TIMER:
+      case MainThreadTaskQueue::QueueClass::kTimer:
         observer = &main_thread_only().timer_task_cost_estimator;
         break;
       default:
@@ -210,13 +210,13 @@
                           time_source,
                           kShortIdlePeriodDurationSampleCount,
                           kShortIdlePeriodDurationPercentile),
-      current_use_case(UseCase::NONE,
+      current_use_case(UseCase::kNone,
                        "RendererScheduler.UseCase",
                        renderer_scheduler_impl,
                        UseCaseToString),
       renderer_pause_count(0),
       navigation_task_expected_count(0),
-      expensive_task_policy(ExpensiveTaskPolicy::RUN),
+      expensive_task_policy(ExpensiveTaskPolicy::kRun),
       renderer_hidden(false),
       renderer_backgrounded(false,
                             "RendererScheduler.Backgrounded",
@@ -257,7 +257,7 @@
       wake_up_budget_pool(nullptr),
       metrics_helper(renderer_scheduler_impl, now, renderer_backgrounded),
       process_type(RendererProcessType::kRenderer),
-      virtual_time_policy(VirtualTimePolicy::ADVANCE),
+      virtual_time_policy(VirtualTimePolicy::kAdvance),
       virtual_time_pause_count(0),
       max_virtual_time_task_starvation_count(0),
       virtual_time_stopped(false),
@@ -355,7 +355,7 @@
   return default_timer_task_queue_;
 }
 
-scoped_refptr<MainThreadTaskQueue> RendererSchedulerImpl::V8TaskQueue() {
+scoped_refptr<MainThreadTaskQueue> RendererSchedulerImpl::kV8TaskQueue() {
   helper_.CheckOnValidThread();
   return v8_task_queue_;
 }
@@ -383,9 +383,9 @@
   auto insert_result =
       task_runners_.insert(std::make_pair(task_queue, std::move(voter)));
   auto queue_class = task_queue->queue_class();
-  if (queue_class == MainThreadTaskQueue::QueueClass::TIMER) {
+  if (queue_class == MainThreadTaskQueue::QueueClass::kTimer) {
     task_queue->AddTaskObserver(&main_thread_only().timer_task_cost_estimator);
-  } else if (queue_class == MainThreadTaskQueue::QueueClass::LOADING) {
+  } else if (queue_class == MainThreadTaskQueue::QueueClass::kLoading) {
     task_queue->AddTaskObserver(
         &main_thread_only().loading_task_cost_estimator);
   }
@@ -397,9 +397,9 @@
   if (task_queue->CanBeThrottled())
     AddQueueToWakeUpBudgetPool(task_queue.get());
 
-  if (queue_class == MainThreadTaskQueue::QueueClass::TIMER) {
+  if (queue_class == MainThreadTaskQueue::QueueClass::kTimer) {
     if (main_thread_only().virtual_time_stopped)
-      task_queue->InsertFence(TaskQueue::InsertFencePosition::NOW);
+      task_queue->InsertFence(TaskQueue::InsertFencePosition::kNow);
   }
 
   return task_queue;
@@ -408,7 +408,7 @@
 scoped_refptr<MainThreadTaskQueue> RendererSchedulerImpl::NewLoadingTaskQueue(
     MainThreadTaskQueue::QueueType queue_type) {
   DCHECK_EQ(MainThreadTaskQueue::QueueClassForQueueType(queue_type),
-            MainThreadTaskQueue::QueueClass::LOADING);
+            MainThreadTaskQueue::QueueClass::kLoading);
   return NewTaskQueue(
       MainThreadTaskQueue::QueueCreationParams(queue_type)
           .SetCanBePaused(true)
@@ -416,13 +416,13 @@
           .SetCanBeDeferred(true)
           .SetUsedForControlTasks(
               queue_type ==
-              MainThreadTaskQueue::QueueType::FRAME_LOADING_CONTROL));
+              MainThreadTaskQueue::QueueType::kFrameLoading_kControl));
 }
 
 scoped_refptr<MainThreadTaskQueue> RendererSchedulerImpl::NewTimerTaskQueue(
     MainThreadTaskQueue::QueueType queue_type) {
   DCHECK_EQ(MainThreadTaskQueue::QueueClassForQueueType(queue_type),
-            MainThreadTaskQueue::QueueClass::TIMER);
+            MainThreadTaskQueue::QueueClass::kTimer);
   return NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(queue_type)
                           .SetShouldReportWhenExecutionBlocked(true)
                           .SetCanBePaused(true)
@@ -446,10 +446,10 @@
 
   if (task_runners_.erase(task_queue)) {
     switch (task_queue->queue_class()) {
-      case MainThreadTaskQueue::QueueClass::TIMER:
+      case MainThreadTaskQueue::QueueClass::kTimer:
         task_queue->RemoveTaskObserver(
             &main_thread_only().timer_task_cost_estimator);
-      case MainThreadTaskQueue::QueueClass::LOADING:
+      case MainThreadTaskQueue::QueueClass::kLoading:
         task_queue->RemoveTaskObserver(
             &main_thread_only().loading_task_cost_estimator);
       default:
@@ -503,7 +503,7 @@
     // TODO(rmcilroy): Consider reducing the idle period based on the runtime of
     // the next pending delayed tasks (as currently done in for long idle times)
     idle_helper_.StartIdlePeriod(
-        IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, now,
+        IdleHelper::IdlePeriodState::kInShortIdlePeriod, now,
         main_thread_only().estimated_next_frame_begin);
   }
 
@@ -543,7 +543,7 @@
     // TODO(rmcilroy): Consider reducing the idle period based on the runtime of
     // the next pending delayed tasks (as currently done in for long idle times)
     idle_helper_.StartIdlePeriod(
-        IdleHelper::IdlePeriodState::IN_SHORT_IDLE_PERIOD, now, time);
+        IdleHelper::IdlePeriodState::kInShortIdlePeriod, now, time);
   }
 }
 
@@ -590,7 +590,7 @@
       has_visible_render_widget_with_touch_handler;
 
   base::AutoLock lock(any_thread_lock_);
-  UpdatePolicyLocked(UpdateType::FORCE_UPDATE);
+  UpdatePolicyLocked(UpdateType::kForceUpdate);
 }
 
 void RendererSchedulerImpl::SetRendererHidden(bool hidden) {
@@ -614,12 +614,12 @@
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                  "RendererSchedulerImpl::OnRendererBackgrounded");
     RendererMetricsHelper::RecordBackgroundedTransition(
-        BackgroundedRendererTransition::BACKGROUNDED);
+        BackgroundedRendererTransition::kBackgrounded);
   } else {
     TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                  "RendererSchedulerImpl::OnRendererForegrounded");
     RendererMetricsHelper::RecordBackgroundedTransition(
-        BackgroundedRendererTransition::FOREGROUNDED);
+        BackgroundedRendererTransition::kForegrounded);
   }
 
   main_thread_only().renderer_backgrounded = backgrounded;
@@ -891,7 +891,7 @@
         result == WebInputEventResult::kHandledApplication) {
       any_thread().awaiting_touch_start_response = false;
       any_thread().default_gesture_prevented = true;
-      UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
+      UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged);
     }
   }
 }
@@ -910,10 +910,10 @@
   // indicate a strong likelihood of high-priority work in the near future.
   UseCase use_case = main_thread_only().current_use_case;
   return main_thread_only().touchstart_expected_soon ||
-         use_case == UseCase::TOUCHSTART ||
-         use_case == UseCase::MAIN_THREAD_GESTURE ||
-         use_case == UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING ||
-         use_case == UseCase::SYNCHRONIZED_GESTURE;
+         use_case == UseCase::kTouchstart ||
+         use_case == UseCase::kMainThreadGesture ||
+         use_case == UseCase::kMainThreadCustomInputHandling ||
+         use_case == UseCase::kSynchronizedGesture;
 }
 
 bool RendererSchedulerImpl::ShouldYieldForHighPriorityWork() {
@@ -928,20 +928,20 @@
   // for it since these tasks are not user-provided work and they are only
   // intended to run before the next task, not interrupt the tasks.
   switch (main_thread_only().current_use_case) {
-    case UseCase::COMPOSITOR_GESTURE:
-    case UseCase::NONE:
+    case UseCase::kCompositorGesture:
+    case UseCase::kNone:
       return main_thread_only().touchstart_expected_soon;
 
-    case UseCase::MAIN_THREAD_GESTURE:
-    case UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING:
-    case UseCase::SYNCHRONIZED_GESTURE:
+    case UseCase::kMainThreadGesture:
+    case UseCase::kMainThreadCustomInputHandling:
+    case UseCase::kSynchronizedGesture:
       return compositor_task_queue_->HasTaskToRunImmediately() ||
              main_thread_only().touchstart_expected_soon;
 
-    case UseCase::TOUCHSTART:
+    case UseCase::kTouchstart:
       return true;
 
-    case UseCase::LOADING:
+    case UseCase::kLoading:
       return false;
 
     default:
@@ -984,12 +984,12 @@
 
 void RendererSchedulerImpl::UpdatePolicy() {
   base::AutoLock lock(any_thread_lock_);
-  UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
+  UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged);
 }
 
 void RendererSchedulerImpl::ForceUpdatePolicy() {
   base::AutoLock lock(any_thread_lock_);
-  UpdatePolicyLocked(UpdateType::FORCE_UPDATE);
+  UpdatePolicyLocked(UpdateType::kForceUpdate);
 }
 
 namespace {
@@ -1106,81 +1106,81 @@
           kFastCompositingIdleTimeThreshold;
 
   Policy new_policy;
-  ExpensiveTaskPolicy expensive_task_policy = ExpensiveTaskPolicy::RUN;
+  ExpensiveTaskPolicy expensive_task_policy = ExpensiveTaskPolicy::kRun;
   new_policy.rail_mode() = v8::PERFORMANCE_ANIMATION;
 
   switch (use_case) {
-    case UseCase::COMPOSITOR_GESTURE:
+    case UseCase::kCompositorGesture:
       if (touchstart_expected_soon) {
         new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE;
-        expensive_task_policy = ExpensiveTaskPolicy::BLOCK;
+        expensive_task_policy = ExpensiveTaskPolicy::kBlock;
         new_policy.compositor_queue_policy().priority =
-            TaskQueue::HIGH_PRIORITY;
+            TaskQueue::kHighPriority;
       } else {
         // What we really want to do is priorize loading tasks, but that doesn't
         // seem to be safe. Instead we do that by proxy by deprioritizing
         // compositor tasks. This should be safe since we've already gone to the
         // pain of fixing ordering issues with them.
-        new_policy.compositor_queue_policy().priority = TaskQueue::LOW_PRIORITY;
+        new_policy.compositor_queue_policy().priority = TaskQueue::kLowPriority;
       }
       break;
 
-    case UseCase::SYNCHRONIZED_GESTURE:
+    case UseCase::kSynchronizedGesture:
       new_policy.compositor_queue_policy().priority =
-          main_thread_compositing_is_fast ? TaskQueue::HIGH_PRIORITY
-                                          : TaskQueue::NORMAL_PRIORITY;
+          main_thread_compositing_is_fast ? TaskQueue::kHighPriority
+                                          : TaskQueue::kNormalPriority;
       if (touchstart_expected_soon) {
         new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE;
-        expensive_task_policy = ExpensiveTaskPolicy::BLOCK;
+        expensive_task_policy = ExpensiveTaskPolicy::kBlock;
       } else {
-        expensive_task_policy = ExpensiveTaskPolicy::THROTTLE;
+        expensive_task_policy = ExpensiveTaskPolicy::kThrottle;
       }
       break;
 
-    case UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING:
+    case UseCase::kMainThreadCustomInputHandling:
       // In main thread input handling scenarios we don't have perfect knowledge
       // about which things we should be prioritizing, so we don't attempt to
       // block expensive tasks because we don't know whether they were integral
       // to the page's functionality or not.
       new_policy.compositor_queue_policy().priority =
-          main_thread_compositing_is_fast ? TaskQueue::HIGH_PRIORITY
-                                          : TaskQueue::NORMAL_PRIORITY;
+          main_thread_compositing_is_fast ? TaskQueue::kHighPriority
+                                          : TaskQueue::kNormalPriority;
       break;
 
-    case UseCase::MAIN_THREAD_GESTURE:
+    case UseCase::kMainThreadGesture:
       // A main thread gesture is for example a scroll gesture which is handled
       // by the main thread. Since we know the established gesture type, we can
       // be a little more aggressive about prioritizing compositing and input
       // handling over other tasks.
-      new_policy.compositor_queue_policy().priority = TaskQueue::HIGH_PRIORITY;
+      new_policy.compositor_queue_policy().priority = TaskQueue::kHighPriority;
       if (touchstart_expected_soon) {
         new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE;
-        expensive_task_policy = ExpensiveTaskPolicy::BLOCK;
+        expensive_task_policy = ExpensiveTaskPolicy::kBlock;
       } else {
-        expensive_task_policy = ExpensiveTaskPolicy::THROTTLE;
+        expensive_task_policy = ExpensiveTaskPolicy::kThrottle;
       }
       break;
 
-    case UseCase::TOUCHSTART:
+    case UseCase::kTouchstart:
       new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE;
-      new_policy.compositor_queue_policy().priority = TaskQueue::HIGH_PRIORITY;
+      new_policy.compositor_queue_policy().priority = TaskQueue::kHighPriority;
       new_policy.loading_queue_policy().is_blocked = true;
       new_policy.timer_queue_policy().is_blocked = true;
       // NOTE this is a nop due to the above.
-      expensive_task_policy = ExpensiveTaskPolicy::BLOCK;
+      expensive_task_policy = ExpensiveTaskPolicy::kBlock;
       break;
 
-    case UseCase::NONE:
+    case UseCase::kNone:
       // It's only safe to block tasks that if we are expecting a compositor
       // driven gesture.
       if (touchstart_expected_soon &&
           any_thread().last_gesture_was_compositor_driven) {
         new_policy.rail_mode() = v8::PERFORMANCE_RESPONSE;
-        expensive_task_policy = ExpensiveTaskPolicy::BLOCK;
+        expensive_task_policy = ExpensiveTaskPolicy::kBlock;
       }
       break;
 
-    case UseCase::LOADING:
+    case UseCase::kLoading:
       new_policy.rail_mode() = v8::PERFORMANCE_LOAD;
       // TODO(skyostil): Experiment with increasing loading and default queue
       // priorities and throttling rendering frame rate.
@@ -1194,24 +1194,24 @@
   if (main_thread_only().renderer_hidden)
     new_policy.rail_mode() = v8::PERFORMANCE_IDLE;
 
-  if (expensive_task_policy == ExpensiveTaskPolicy::BLOCK &&
+  if (expensive_task_policy == ExpensiveTaskPolicy::kBlock &&
       (!main_thread_only().have_seen_a_begin_main_frame ||
        main_thread_only().navigation_task_expected_count > 0)) {
-    expensive_task_policy = ExpensiveTaskPolicy::RUN;
+    expensive_task_policy = ExpensiveTaskPolicy::kRun;
   }
 
   switch (expensive_task_policy) {
-    case ExpensiveTaskPolicy::RUN:
+    case ExpensiveTaskPolicy::kRun:
       break;
 
-    case ExpensiveTaskPolicy::BLOCK:
+    case ExpensiveTaskPolicy::kBlock:
       if (loading_tasks_seem_expensive)
         new_policy.loading_queue_policy().is_blocked = true;
       if (timer_tasks_seem_expensive)
         new_policy.timer_queue_policy().is_blocked = true;
       break;
 
-    case ExpensiveTaskPolicy::THROTTLE:
+    case ExpensiveTaskPolicy::kThrottle:
       if (loading_tasks_seem_expensive) {
         new_policy.loading_queue_policy().is_throttled = true;
       }
@@ -1262,7 +1262,7 @@
                  "expensive_task_policy", expensive_task_policy);
 
   // TODO(alexclarke): Can we get rid of force update now?
-  if (update_type == UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED &&
+  if (update_type == UpdateType::kMayEarlyOutIfPolicyUnchanged &&
       new_policy == main_thread_only().current_policy) {
     return;
   }
@@ -1290,8 +1290,8 @@
       SetStoppedInBackground(main_thread_only().stopped_when_backgrounded);
       RendererMetricsHelper::RecordBackgroundedTransition(
           main_thread_only().stopped_when_backgrounded
-              ? BackgroundedRendererTransition::STOPPED_AFTER_DELAY
-              : BackgroundedRendererTransition::RESUMED);
+              ? BackgroundedRendererTransition::kStoppedAfterDelay
+              : BackgroundedRendererTransition::kResumed);
     }
   }
 
@@ -1335,12 +1335,12 @@
       new_task_queue_policy.GetTimeDomainType(task_queue);
 
   if (old_time_domain_type != new_time_domain_type) {
-    if (old_time_domain_type == TimeDomainType::THROTTLED) {
+    if (old_time_domain_type == TimeDomainType::kThrottled) {
       task_queue_throttler_->DecreaseThrottleRefCount(task_queue);
-    } else if (new_time_domain_type == TimeDomainType::THROTTLED) {
+    } else if (new_time_domain_type == TimeDomainType::kThrottled) {
       task_queue_throttler_->IncreaseThrottleRefCount(task_queue);
     }
-    if (new_time_domain_type == TimeDomainType::VIRTUAL) {
+    if (new_time_domain_type == TimeDomainType::kVirtual) {
       DCHECK(virtual_time_domain_);
       task_queue->SetTimeDomain(virtual_time_domain_.get());
     } else {
@@ -1359,7 +1359,7 @@
       !any_thread().awaiting_touch_start_response) {
     *expected_use_case_duration =
         any_thread().fling_compositor_escalation_deadline - now;
-    return UseCase::COMPOSITOR_GESTURE;
+    return UseCase::kCompositorGesture;
   }
   // Above all else we want to be responsive to user input.
   *expected_use_case_duration =
@@ -1368,12 +1368,12 @@
     // Has a gesture been fully established?
     if (any_thread().awaiting_touch_start_response) {
       // No, so arrange for compositor tasks to be run at the highest priority.
-      return UseCase::TOUCHSTART;
+      return UseCase::kTouchstart;
     }
 
     // Yes a gesture has been established.  Based on how the gesture is handled
     // we need to choose between one of four use cases:
-    // 1. COMPOSITOR_GESTURE where the gesture is processed only on the
+    // 1. kCompositorGesture where the gesture is processed only on the
     //    compositor thread.
     // 2. MAIN_THREAD_GESTURE where the gesture is processed only on the main
     //    thread.
@@ -1383,15 +1383,15 @@
     // 4. SYNCHRONIZED_GESTURE where the gesture is processed on both threads.
     if (any_thread().last_gesture_was_compositor_driven) {
       if (any_thread().begin_main_frame_on_critical_path) {
-        return UseCase::SYNCHRONIZED_GESTURE;
+        return UseCase::kSynchronizedGesture;
       } else {
-        return UseCase::COMPOSITOR_GESTURE;
+        return UseCase::kCompositorGesture;
       }
     }
     if (any_thread().default_gesture_prevented) {
-      return UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING;
+      return UseCase::kMainThreadCustomInputHandling;
     } else {
-      return UseCase::MAIN_THREAD_GESTURE;
+      return UseCase::kMainThreadGesture;
     }
   }
 
@@ -1400,23 +1400,23 @@
   // content on the page.
   if (any_thread().waiting_for_meaningful_paint &&
       !any_thread().have_seen_input_since_navigation) {
-    return UseCase::LOADING;
+    return UseCase::kLoading;
   }
-  return UseCase::NONE;
+  return UseCase::kNone;
 }
 
 base::TimeDelta RendererSchedulerImpl::EstimateLongestJankFreeTaskDuration()
     const {
   switch (main_thread_only().current_use_case) {
-    case UseCase::TOUCHSTART:
-    case UseCase::COMPOSITOR_GESTURE:
-    case UseCase::LOADING:
-    case UseCase::NONE:
+    case UseCase::kTouchstart:
+    case UseCase::kCompositorGesture:
+    case UseCase::kLoading:
+    case UseCase::kNone:
       return base::TimeDelta::FromMilliseconds(kRailsResponseTimeMillis);
 
-    case UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING:
-    case UseCase::MAIN_THREAD_GESTURE:
-    case UseCase::SYNCHRONIZED_GESTURE:
+    case UseCase::kMainThreadCustomInputHandling:
+    case UseCase::kMainThreadGesture:
+    case UseCase::kSynchronizedGesture:
       return main_thread_only().idle_time_estimator.GetExpectedIdleDuration(
           main_thread_only().compositor_frame_interval);
 
@@ -1432,7 +1432,7 @@
   helper_.CheckOnValidThread();
 
   MaybeUpdatePolicy();
-  if (main_thread_only().current_use_case == UseCase::TOUCHSTART) {
+  if (main_thread_only().current_use_case == UseCase::kTouchstart) {
     // Don't start a long idle task in touch start priority, try again when
     // the policy is scheduled to end.
     *next_long_idle_period_delay_out =
@@ -1487,9 +1487,9 @@
   DCHECK(!virtual_time_control_task_queue_);
   virtual_time_control_task_queue_ =
       helper_.NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-          MainThreadTaskQueue::QueueType::CONTROL));
+          MainThreadTaskQueue::QueueType::kControl));
   virtual_time_control_task_queue_->SetQueuePriority(
-      TaskQueue::CONTROL_PRIORITY);
+      TaskQueue::kControlPriority);
   virtual_time_control_task_queue_->SetTimeDomain(virtual_time_domain_.get());
 
   main_thread_only().use_virtual_time = true;
@@ -1542,10 +1542,10 @@
 
 void RendererSchedulerImpl::VirtualTimePaused() {
   for (const auto& pair : task_runners_) {
-    if (pair.first->queue_class() == MainThreadTaskQueue::QueueClass::TIMER) {
+    if (pair.first->queue_class() == MainThreadTaskQueue::QueueClass::kTimer) {
       DCHECK(!task_queue_throttler_->IsThrottled(pair.first.get()));
       DCHECK(!pair.first->HasActiveFence());
-      pair.first->InsertFence(TaskQueue::InsertFencePosition::NOW);
+      pair.first->InsertFence(TaskQueue::InsertFencePosition::kNow);
     }
   }
   for (auto& observer : main_thread_only().virtual_time_observers) {
@@ -1556,7 +1556,7 @@
 
 void RendererSchedulerImpl::VirtualTimeResumed() {
   for (const auto& pair : task_runners_) {
-    if (pair.first->queue_class() == MainThreadTaskQueue::QueueClass::TIMER) {
+    if (pair.first->queue_class() == MainThreadTaskQueue::QueueClass::kTimer) {
       DCHECK(!task_queue_throttler_->IsThrottled(pair.first.get()));
       DCHECK(pair.first->HasActiveFence());
       pair.first->RemoveFence();
@@ -1583,15 +1583,15 @@
   main_thread_only().virtual_time_policy = policy;
 
   switch (policy) {
-    case VirtualTimePolicy::ADVANCE:
+    case VirtualTimePolicy::kAdvance:
       SetVirtualTimeStopped(false);
       break;
 
-    case VirtualTimePolicy::PAUSE:
+    case VirtualTimePolicy::kPause:
       SetVirtualTimeStopped(true);
       break;
 
-    case VirtualTimePolicy::DETERMINISTIC_LOADING:
+    case VirtualTimePolicy::kDeterministicLoading:
       ApplyVirtualTimePolicy();
       break;
   }
@@ -1618,7 +1618,7 @@
 
 void RendererSchedulerImpl::ApplyVirtualTimePolicy() {
   switch (main_thread_only().virtual_time_policy) {
-    case VirtualTimePolicy::ADVANCE:
+    case VirtualTimePolicy::kAdvance:
       if (virtual_time_domain_) {
         virtual_time_domain_->SetMaxVirtualTimeTaskStarvationCount(
             main_thread_only().nested_runloop
@@ -1627,12 +1627,12 @@
       }
       SetVirtualTimeStopped(false);
       break;
-    case VirtualTimePolicy::PAUSE:
+    case VirtualTimePolicy::kPause:
       if (virtual_time_domain_)
         virtual_time_domain_->SetMaxVirtualTimeTaskStarvationCount(0);
       SetVirtualTimeStopped(true);
       break;
-    case VirtualTimePolicy::DETERMINISTIC_LOADING:
+    case VirtualTimePolicy::kDeterministicLoading:
       if (virtual_time_domain_) {
         virtual_time_domain_->SetMaxVirtualTimeTaskStarvationCount(
             main_thread_only().nested_runloop
@@ -1686,11 +1686,11 @@
 const char* RendererSchedulerImpl::ExpensiveTaskPolicyToString(
     ExpensiveTaskPolicy expensive_task_policy) {
   switch (expensive_task_policy) {
-    case ExpensiveTaskPolicy::RUN:
+    case ExpensiveTaskPolicy::kRun:
       return "RUN";
-    case ExpensiveTaskPolicy::BLOCK:
+    case ExpensiveTaskPolicy::kBlock:
       return "BLOCK";
-    case ExpensiveTaskPolicy::THROTTLE:
+    case ExpensiveTaskPolicy::kThrottle:
       return "THROTTLE";
     default:
       NOTREACHED();
@@ -1834,7 +1834,7 @@
 
 TaskQueue::QueuePriority RendererSchedulerImpl::TaskQueuePolicy::GetPriority(
     MainThreadTaskQueue* task_queue) const {
-  return task_queue->UsedForControlTasks() ? TaskQueue::HIGH_PRIORITY
+  return task_queue->UsedForControlTasks() ? TaskQueue::kHighPriority
                                            : priority;
 }
 
@@ -1842,10 +1842,10 @@
 RendererSchedulerImpl::TaskQueuePolicy::GetTimeDomainType(
     MainThreadTaskQueue* task_queue) const {
   if (use_virtual_time)
-    return TimeDomainType::VIRTUAL;
+    return TimeDomainType::kVirtual;
   if (is_throttled && task_queue->CanBeThrottled())
-    return TimeDomainType::THROTTLED;
-  return TimeDomainType::REAL;
+    return TimeDomainType::kThrottled;
+  return TimeDomainType::kReal;
 }
 
 void RendererSchedulerImpl::TaskQueuePolicy::AsValueInto(
@@ -1884,7 +1884,7 @@
 void RendererSchedulerImpl::OnIdlePeriodStarted() {
   base::AutoLock lock(any_thread_lock_);
   any_thread().in_idle_period = true;
-  UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
+  UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged);
 }
 
 void RendererSchedulerImpl::OnIdlePeriodEnded() {
@@ -1892,7 +1892,7 @@
   any_thread().last_idle_period_end_time =
       helper_.scheduler_tqm_delegate()->NowTicks();
   any_thread().in_idle_period = false;
-  UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
+  UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged);
 }
 
 void RendererSchedulerImpl::OnPendingTasksChanged(bool has_tasks) {
@@ -1973,7 +1973,7 @@
                "RendererSchedulerImpl::OnFirstMeaningfulPaint");
   base::AutoLock lock(any_thread_lock_);
   any_thread().waiting_for_meaningful_paint = false;
-  UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
+  UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged);
 }
 
 void RendererSchedulerImpl::ResetForNavigationLocked() {
@@ -1995,7 +1995,7 @@
        main_thread_only().web_view_schedulers) {
     web_view_scheduler->OnNavigation();
   }
-  UpdatePolicyLocked(UpdateType::MAY_EARLY_OUT_IF_POLICY_UNCHANGED);
+  UpdatePolicyLocked(UpdateType::kMayEarlyOutIfPolicyUnchanged);
 
   UMA_HISTOGRAM_COUNTS_100("RendererScheduler.WebViewsPerScheduler",
                            main_thread_only().web_view_schedulers.size());
@@ -2105,7 +2105,7 @@
 }
 
 void RendererSchedulerImpl::OnTriedToExecuteBlockedTask() {
-  if (main_thread_only().current_use_case == UseCase::TOUCHSTART ||
+  if (main_thread_only().current_use_case == UseCase::kTouchstart ||
       main_thread_only().longest_jank_free_task_duration <
           base::TimeDelta::FromMilliseconds(kRailsResponseTimeMillis) ||
       main_thread_only().renderer_pause_count ||
@@ -2289,19 +2289,19 @@
 // static
 const char* RendererSchedulerImpl::UseCaseToString(UseCase use_case) {
   switch (use_case) {
-    case UseCase::NONE:
+    case UseCase::kNone:
       return "none";
-    case UseCase::COMPOSITOR_GESTURE:
+    case UseCase::kCompositorGesture:
       return "compositor_gesture";
-    case UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING:
+    case UseCase::kMainThreadCustomInputHandling:
       return "main_thread_custom_input_handling";
-    case UseCase::SYNCHRONIZED_GESTURE:
+    case UseCase::kSynchronizedGesture:
       return "synchronized_gesture";
-    case UseCase::TOUCHSTART:
+    case UseCase::kTouchstart:
       return "touchstart";
-    case UseCase::LOADING:
+    case UseCase::kLoading:
       return "loading";
-    case UseCase::MAIN_THREAD_GESTURE:
+    case UseCase::kMainThreadGesture:
       return "main_thread_gesture";
     default:
       NOTREACHED();
@@ -2330,11 +2330,11 @@
 const char* RendererSchedulerImpl::TimeDomainTypeToString(
     TimeDomainType domain_type) {
   switch (domain_type) {
-    case TimeDomainType::REAL:
+    case TimeDomainType::kReal:
       return "real";
-    case TimeDomainType::THROTTLED:
+    case TimeDomainType::kThrottled:
       return "throttled";
-    case TimeDomainType::VIRTUAL:
+    case TimeDomainType::kVirtual:
       return "virtual";
     default:
       NOTREACHED();
@@ -2346,11 +2346,11 @@
 const char* RendererSchedulerImpl::VirtualTimePolicyToString(
     VirtualTimePolicy virtual_time_policy) {
   switch (virtual_time_policy) {
-    case VirtualTimePolicy::ADVANCE:
+    case VirtualTimePolicy::kAdvance:
       return "ADVANCE";
-    case VirtualTimePolicy::PAUSE:
+    case VirtualTimePolicy::kPause:
       return "PAUSE";
-    case VirtualTimePolicy::DETERMINISTIC_LOADING:
+    case VirtualTimePolicy::kDeterministicLoading:
       return "DETERMINISTIC_LOADING";
     default:
       NOTREACHED();
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
index 411eaebf..c20e9289 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.h
@@ -63,31 +63,31 @@
   // Keep RendererScheduler::UseCaseToString in sync with this enum.
   enum class UseCase {
     // No active use case detected.
-    NONE,
+    kNone,
     // A continuous gesture (e.g., scroll, pinch) which is being driven by the
     // compositor thread.
-    COMPOSITOR_GESTURE,
+    kCompositorGesture,
     // An unspecified touch gesture which is being handled by the main thread.
     // Note that since we don't have a full view of the use case, we should be
     // careful to prioritize all work equally.
-    MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+    kMainThreadCustomInputHandling,
     // A continuous gesture (e.g., scroll, pinch) which is being driven by the
     // compositor thread but also observed by the main thread. An example is
     // synchronized scrolling where a scroll listener on the main thread changes
     // page layout based on the current scroll position.
-    SYNCHRONIZED_GESTURE,
+    kSynchronizedGesture,
     // A gesture has recently started and we are about to run main thread touch
     // listeners to find out the actual gesture type. To minimize touch latency,
     // only input handling work should run in this state.
-    TOUCHSTART,
+    kTouchstart,
     // A page is loading.
-    LOADING,
+    kLoading,
     // A continuous gesture (e.g., scroll) which is being handled by the main
     // thread.
-    MAIN_THREAD_GESTURE,
+    kMainThreadGesture,
     // Must be the last entry.
-    USE_CASE_COUNT,
-    FIRST_USE_CASE = NONE,
+    kUseCaseCount,
+    kFirstUseCase = kNone,
   };
   static const char* UseCaseToString(UseCase use_case);
   static const char* RAILModeToString(v8::RAILMode rail_mode);
@@ -163,7 +163,7 @@
   scoped_refptr<MainThreadTaskQueue> CompositorTaskQueue();
   scoped_refptr<MainThreadTaskQueue> LoadingTaskQueue();
   scoped_refptr<MainThreadTaskQueue> TimerTaskQueue();
-  scoped_refptr<MainThreadTaskQueue> V8TaskQueue();
+  scoped_refptr<MainThreadTaskQueue> kV8TaskQueue();
 
   // Returns a new task queue created with given params.
   scoped_refptr<MainThreadTaskQueue> NewTaskQueue(
@@ -171,7 +171,7 @@
 
   // Returns a new loading task queue. This queue is intended for tasks related
   // to resource dispatch, foreground HTML parsing, etc...
-  // Note: Tasks posted to FRAME_LOADING_CONTROL queues must execute quickly.
+  // Note: Tasks posted to kFrameLoading_kControl queues must execute quickly.
   scoped_refptr<MainThreadTaskQueue> NewLoadingTaskQueue(
       MainThreadTaskQueue::QueueType queue_type);
 
@@ -292,12 +292,12 @@
       renderer_scheduler_impl_unittest::RendererSchedulerImplTest,
       Tracing);
 
-  enum class ExpensiveTaskPolicy { RUN, BLOCK, THROTTLE };
+  enum class ExpensiveTaskPolicy { kRun, kBlock, kThrottle };
 
   enum class TimeDomainType {
-    REAL,
-    THROTTLED,
-    VIRTUAL,
+    kReal,
+    kThrottled,
+    kVirtual,
   };
 
   static const char* TimeDomainTypeToString(TimeDomainType domain_type);
@@ -314,7 +314,7 @@
           is_blocked(false),
           is_stopped(false),
           use_virtual_time(false),
-          priority(TaskQueue::NORMAL_PRIORITY) {}
+          priority(TaskQueue::kNormalPriority) {}
 
     bool is_enabled;
     bool is_paused;
@@ -350,38 +350,38 @@
 
     TaskQueuePolicy& compositor_queue_policy() {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::COMPOSITOR)];
+          MainThreadTaskQueue::QueueClass::kCompositor)];
     }
     const TaskQueuePolicy& compositor_queue_policy() const {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::COMPOSITOR)];
+          MainThreadTaskQueue::QueueClass::kCompositor)];
     }
 
     TaskQueuePolicy& loading_queue_policy() {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::LOADING)];
+          MainThreadTaskQueue::QueueClass::kLoading)];
     }
     const TaskQueuePolicy& loading_queue_policy() const {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::LOADING)];
+          MainThreadTaskQueue::QueueClass::kLoading)];
     }
 
     TaskQueuePolicy& timer_queue_policy() {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::TIMER)];
+          MainThreadTaskQueue::QueueClass::kTimer)];
     }
     const TaskQueuePolicy& timer_queue_policy() const {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::TIMER)];
+          MainThreadTaskQueue::QueueClass::kTimer)];
     }
 
     TaskQueuePolicy& default_queue_policy() {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::NONE)];
+          MainThreadTaskQueue::QueueClass::kNone)];
     }
     const TaskQueuePolicy& default_queue_policy() const {
       return policies_[static_cast<size_t>(
-          MainThreadTaskQueue::QueueClass::NONE)];
+          MainThreadTaskQueue::QueueClass::kNone)];
     }
 
     const TaskQueuePolicy& GetQueuePolicy(
@@ -409,7 +409,7 @@
     bool should_disable_throttling_;
 
     std::array<TaskQueuePolicy,
-               static_cast<size_t>(MainThreadTaskQueue::QueueClass::COUNT)>
+               static_cast<size_t>(MainThreadTaskQueue::QueueClass::kCount)>
         policies_;
   };
 
@@ -498,12 +498,12 @@
   void ForceUpdatePolicy();
 
   enum class UpdateType {
-    MAY_EARLY_OUT_IF_POLICY_UNCHANGED,
-    FORCE_UPDATE,
+    kMayEarlyOutIfPolicyUnchanged,
+    kForceUpdate,
   };
 
   // The implelemtation of UpdatePolicy & ForceUpdatePolicy.  It is allowed to
-  // early out if |update_type| is MAY_EARLY_OUT_IF_POLICY_UNCHANGED.
+  // early out if |update_type| is kMayEarlyOutIfPolicyUnchanged.
   virtual void UpdatePolicyLocked(UpdateType update_type);
 
   // Helper for computing the use case. |expected_usecase_duration| will be
@@ -657,12 +657,12 @@
     base::TimeTicks initial_virtual_time;
     VirtualTimePolicy virtual_time_policy;
 
-    // In VirtualTimePolicy::DETERMINISTIC_LOADING virtual time is only allowed
+    // In VirtualTimePolicy::kDeterministicLoading virtual time is only allowed
     // to advance if this is zero.
     int virtual_time_pause_count;
 
     // The maximum number amount of delayed task starvation we will allow in
-    // VirtualTimePolicy::ADVANCE or VirtualTimePolicy::DETERMINISTIC_LOADING
+    // VirtualTimePolicy::kAdvance or VirtualTimePolicy::kDeterministicLoading
     // unless the run_loop is nested (in which case infinite starvation is
     // allowed). NB a value of 0 allows infinite starvation.
     int max_virtual_time_task_starvation_count;
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
index 212cada..8c0444b 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl_unittest.cc
@@ -298,12 +298,12 @@
     compositor_task_runner_ = scheduler_->CompositorTaskQueue();
     loading_task_runner_ = scheduler_->LoadingTaskQueue();
     loading_control_task_runner_ = scheduler_->NewLoadingTaskQueue(
-        MainThreadTaskQueue::QueueType::FRAME_LOADING_CONTROL);
+        MainThreadTaskQueue::QueueType::kFrameLoading_kControl);
     idle_task_runner_ = scheduler_->IdleTaskRunner();
     timer_task_runner_ = scheduler_->TimerTaskQueue();
-    v8_task_runner_ = scheduler_->V8TaskQueue();
+    v8_task_runner_ = scheduler_->kV8TaskQueue();
     fake_queue_ = scheduler_->NewLoadingTaskQueue(
-        MainThreadTaskQueue::QueueType::FRAME_LOADING);
+        MainThreadTaskQueue::QueueType::kFrameLoading);
   }
 
   void TearDown() override {
@@ -377,12 +377,12 @@
   }
 
   enum class TouchEventPolicy {
-    SEND_TOUCH_START,
-    DONT_SEND_TOUCH_START,
+    kSendTouchStart,
+    kDontSendTouchStart,
   };
 
   void SimulateCompositorGestureStart(TouchEventPolicy touch_event_policy) {
-    if (touch_event_policy == TouchEventPolicy::SEND_TOUCH_START) {
+    if (touch_event_policy == TouchEventPolicy::kSendTouchStart) {
       scheduler_->DidHandleInputEventOnCompositorThread(
           FakeInputEvent(blink::WebInputEvent::kTouchStart),
           RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
@@ -431,7 +431,7 @@
 
     // Touchstart policy update.
     EXPECT_TRUE(scheduler_->PolicyNeedsUpdateForTesting());
-    EXPECT_EQ(UseCase::TOUCHSTART, ForceUpdatePolicyAndGetCurrentUseCase());
+    EXPECT_EQ(UseCase::kTouchstart, ForceUpdatePolicyAndGetCurrentUseCase());
     EXPECT_FALSE(scheduler_->PolicyNeedsUpdateForTesting());
 
     scheduler_->DidHandleInputEventOnCompositorThread(
@@ -446,7 +446,7 @@
 
     // Main thread gesture policy update.
     EXPECT_TRUE(scheduler_->PolicyNeedsUpdateForTesting());
-    EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+    EXPECT_EQ(UseCase::kMainThreadCustomInputHandling,
               ForceUpdatePolicyAndGetCurrentUseCase());
     EXPECT_FALSE(scheduler_->PolicyNeedsUpdateForTesting());
 
@@ -462,14 +462,14 @@
 
     // Compositor thread gesture policy update.
     EXPECT_TRUE(scheduler_->PolicyNeedsUpdateForTesting());
-    EXPECT_EQ(UseCase::COMPOSITOR_GESTURE,
+    EXPECT_EQ(UseCase::kCompositorGesture,
               ForceUpdatePolicyAndGetCurrentUseCase());
     EXPECT_FALSE(scheduler_->PolicyNeedsUpdateForTesting());
   }
 
   void SimulateMainThreadGestureStart(TouchEventPolicy touch_event_policy,
                                       blink::WebInputEvent::Type gesture_type) {
-    if (touch_event_policy == TouchEventPolicy::SEND_TOUCH_START) {
+    if (touch_event_policy == TouchEventPolicy::kSendTouchStart) {
       scheduler_->DidHandleInputEventOnCompositorThread(
           FakeInputEvent(blink::WebInputEvent::kTouchStart),
           RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
@@ -607,7 +607,7 @@
   // - 'M': Loading Control task
   // - 'I': Idle task
   // - 'T': Timer task
-  // - 'V': V8 task
+  // - 'V': kV8 task
   void PostTestTasks(std::vector<std::string>* run_order,
                      const std::string& task_descriptor) {
     std::istringstream stream(task_descriptor);
@@ -697,8 +697,8 @@
 
   static void CheckAllUseCaseToString() {
     CallForEachEnumValue<RendererSchedulerImpl::UseCase>(
-        RendererSchedulerImpl::UseCase::FIRST_USE_CASE,
-        RendererSchedulerImpl::UseCase::USE_CASE_COUNT,
+        RendererSchedulerImpl::UseCase::kFirstUseCase,
+        RendererSchedulerImpl::UseCase::kUseCaseCount,
         &RendererSchedulerImpl::UseCaseToString);
   }
 
@@ -893,7 +893,7 @@
               ::testing::ElementsAre(std::string("L1"), std::string("D1"),
                                      std::string("C1"), std::string("D2"),
                                      std::string("C2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest, TestDefaultPolicyWithSlowCompositor) {
@@ -908,7 +908,7 @@
               ::testing::ElementsAre(std::string("L1"), std::string("D1"),
                                      std::string("C1"), std::string("D2"),
                                      std::string("C2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest,
@@ -918,13 +918,13 @@
 
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   EnableIdleTasks();
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
   RunUntilIdle();
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("C1"),
                                      std::string("C2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -941,7 +941,7 @@
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 }
 
@@ -958,7 +958,7 @@
               ::testing::ElementsAre(std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("C1"),
                                      std::string("C2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -966,13 +966,13 @@
        TestCompositorPolicy_CompositorHandlesInput_LongGestureDuration) {
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   EnableIdleTasks();
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
 
   base::TimeTicks loop_end_time =
       clock_->NowTicks() + base::TimeDelta::FromMilliseconds(
                                UserModel::kMedianGestureDurationMillis * 2);
 
-  // The UseCase::COMPOSITOR_GESTURE usecase initially deprioritizes compositor
+  // The UseCase::kCompositorGesture usecase initially deprioritizes compositor
   // tasks (see TestCompositorPolicy_CompositorHandlesInput_WithTouchHandler)
   // but if the gesture is long enough, compositor tasks get prioritized again.
   while (clock_->NowTicks() < loop_end_time) {
@@ -991,7 +991,7 @@
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("L1"), std::string("D1"),
                                      std::string("D2")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -1001,13 +1001,13 @@
   PostTestTasks(&run_order, "L1 I1 D1 C1 D2 C2");
 
   EnableIdleTasks();
-  SimulateCompositorGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kDontSendTouchStart);
   RunUntilIdle();
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("C1"),
                                      std::string("C2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -1018,14 +1018,14 @@
 
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   EnableIdleTasks();
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
   RunUntilIdle();
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
   scheduler_->DidHandleInputEventOnMainThread(
       FakeInputEvent(blink::WebInputEvent::kGestureFlingStart),
@@ -1038,14 +1038,14 @@
   PostTestTasks(&run_order, "L1 I1 D1 C1 D2 C2");
 
   EnableIdleTasks();
-  SimulateMainThreadGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kDontSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
   RunUntilIdle();
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
   scheduler_->DidHandleInputEventOnMainThread(
       FakeInputEvent(blink::WebInputEvent::kGestureFlingStart),
@@ -1072,7 +1072,7 @@
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("L1"), std::string("D1"),
                                      std::string("D2"), std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 }
 
@@ -1097,7 +1097,7 @@
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("D1"), std::string("D2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::TOUCHSTART, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kTouchstart, CurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest, TestCompositorPolicy_DidAnimateForInput) {
@@ -1108,7 +1108,7 @@
   scheduler_->DidAnimateForInputOnCompositorThread();
   // Note DidAnimateForInputOnCompositorThread does not by itself trigger a
   // policy update.
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
   EnableIdleTasks();
   RunUntilIdle();
@@ -1116,7 +1116,7 @@
               ::testing::ElementsAre(std::string("D1"), std::string("D2"),
                                      std::string("C1"), std::string("C2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -1129,7 +1129,7 @@
   // A navigation occurs which creates a new Document thus resetting the task
   // cost estimations.
   scheduler_->DidStartProvisionalLoad(true);
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollUpdate);
 
   PostTestTasks(&run_order, "C1 T1");
@@ -1147,14 +1147,14 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   SimulateExpensiveTasks(timer_task_runner_);
   DoMainFrame();
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollUpdate);
 
   PostTestTasks(&run_order, "C1 T1");
 
   RunUntilIdle();
   EXPECT_FALSE(TouchStartExpectedSoon());
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadGesture,
             CurrentUseCase());
 
   EXPECT_THAT(run_order, ::testing::ElementsAre(std::string("C1")));
@@ -1167,14 +1167,14 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   SimulateExpensiveTasks(timer_task_runner_);
   DoMainFrame();
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kUndefined);
 
   PostTestTasks(&run_order, "C1 T1");
 
   RunUntilIdle();
   EXPECT_FALSE(TouchStartExpectedSoon());
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 
   EXPECT_THAT(run_order,
@@ -1188,14 +1188,14 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   SimulateExpensiveTasks(timer_task_runner_);
   DoMainFrameOnCriticalPath();
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
 
   PostTestTasks(&run_order, "C1 T1");
 
   RunUntilIdle();
   EXPECT_FALSE(TouchStartExpectedSoon());
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 
   EXPECT_THAT(run_order,
@@ -1309,7 +1309,7 @@
       std::string("L2"), std::string("C1"), std::string("T1"),
       std::string("C2"), std::string("T2"), std::string("I1")};
   EXPECT_THAT(run_order, ::testing::ElementsAreArray(loading_policy_expected));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::LOADING, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kLoading, CurrentUseCase());
 
   // Advance 15s and try again, the loading policy should have ended and the
   // task order should return to the NONE use case where loading tasks are no
@@ -1325,7 +1325,7 @@
       std::string("L1"), std::string("D2"), std::string("C2"),
       std::string("T2"), std::string("L2"), std::string("I1")};
   EXPECT_THAT(run_order, ::testing::ElementsAreArray(default_order_expected));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest,
@@ -1341,7 +1341,7 @@
       RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
   RunUntilIdle();
   // Note compositor tasks are not prioritized.
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("D1"), std::string("C1"),
                                      std::string("D2"), std::string("C2"),
@@ -1361,7 +1361,7 @@
       RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
   RunUntilIdle();
   // Note compositor tasks are not prioritized.
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("D1"), std::string("C1"),
                                      std::string("D2"), std::string("C2"),
@@ -1382,7 +1382,7 @@
       RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
   RunUntilIdle();
   // Note compositor tasks deprioritized.
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
   EXPECT_THAT(run_order,
               ::testing::ElementsAre(std::string("D1"), std::string("D2"),
@@ -1415,11 +1415,11 @@
 TEST_F(RendererSchedulerImplTest,
        EventForwardedToMainThread_MouseMove_WhenMouseDown_AfterMouseWheel) {
   // Simulate a main thread driven mouse wheel scroll gesture.
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollUpdate);
   RunUntilIdle();
   EXPECT_FALSE(TouchStartExpectedSoon());
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadGesture,
             CurrentUseCase());
 
   // Now start a main thread mouse touch gesture. It should be detected as main
@@ -1438,7 +1438,7 @@
       RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
   RunUntilIdle();
 
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 
   // Note compositor tasks are prioritized.
@@ -1467,7 +1467,7 @@
       RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
   RunUntilIdle();
 
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 
   // Note compositor tasks are prioritized.
@@ -1491,7 +1491,7 @@
               ::testing::ElementsAre(std::string("D1"), std::string("D2"),
                                      std::string("C1"), std::string("C2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -1510,7 +1510,7 @@
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("D1"), std::string("D2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 }
 
@@ -1537,7 +1537,7 @@
               ::testing::ElementsAre(std::string("C1"), std::string("C2"),
                                      std::string("D1"), std::string("D2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadGesture,
             CurrentUseCase());
 }
 
@@ -1566,7 +1566,7 @@
               ::testing::ElementsAre(std::string("D1"), std::string("D2"),
                                      std::string("C1"), std::string("C2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             CurrentUseCase());
 }
 
@@ -1587,7 +1587,7 @@
               ::testing::ElementsAre(std::string("D1"), std::string("C1"),
                                      std::string("D2"), std::string("C2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest,
@@ -1607,7 +1607,7 @@
               ::testing::ElementsAre(std::string("D1"), std::string("C1"),
                                      std::string("D2"), std::string("C2"),
                                      std::string("I1")));
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
   // Note compositor tasks are not prioritized.
   scheduler_->DidHandleInputEventOnMainThread(
       FakeInputEvent(blink::WebInputEvent::kKeyDown),
@@ -1616,7 +1616,7 @@
 
 TEST_F(RendererSchedulerImplTest,
        TestMainthreadScrollingUseCaseDoesNotStarveDefaultTasks) {
-  SimulateMainThreadGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kDontSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
   EnableIdleTasks();
 
@@ -1641,23 +1641,23 @@
 
 TEST_F(RendererSchedulerImplTest,
        TestCompositorPolicyEnds_CompositorHandlesInput) {
-  SimulateCompositorGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START);
-  EXPECT_EQ(UseCase::COMPOSITOR_GESTURE,
+  SimulateCompositorGestureStart(TouchEventPolicy::kDontSendTouchStart);
+  EXPECT_EQ(UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
 
   clock_->Advance(base::TimeDelta::FromMilliseconds(1000));
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest,
        TestCompositorPolicyEnds_MainThreadHandlesInput) {
-  SimulateMainThreadGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kDontSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
-  EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(UseCase::kMainThreadCustomInputHandling,
             ForceUpdatePolicyAndGetCurrentUseCase());
 
   clock_->Advance(base::TimeDelta::FromMilliseconds(1000));
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest, TestTouchstartPolicyEndsAfterTimeout) {
@@ -1764,7 +1764,7 @@
   // Without additional input, the scheduler should go into NONE
   // use case but with scrolling expected where high-priority work is still
   // anticipated.
-  EXPECT_EQ(UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, CurrentUseCase());
   EXPECT_TRUE(TouchStartExpectedSoon());
   EXPECT_TRUE(is_anticipated_before);
   EXPECT_TRUE(is_anticipated_after);
@@ -1777,7 +1777,7 @@
   RunUntilIdle();
   // Eventually the scheduler should go into the default use case where
   // high-priority work is no longer anticipated.
-  EXPECT_EQ(UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, CurrentUseCase());
   EXPECT_FALSE(TouchStartExpectedSoon());
   EXPECT_FALSE(is_anticipated_before);
   EXPECT_FALSE(is_anticipated_after);
@@ -1827,14 +1827,14 @@
 }
 
 TEST_F(RendererSchedulerImplTest, SlowMainThreadInputEvent) {
-  EXPECT_EQ(UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, CurrentUseCase());
 
   // An input event should bump us into input priority.
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kGestureFlingStart),
       RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
   RunUntilIdle();
-  EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING, CurrentUseCase());
+  EXPECT_EQ(UseCase::kMainThreadCustomInputHandling, CurrentUseCase());
 
   // Simulate the input event being queued for a very long time. The compositor
   // task we post here represents the enqueued input task.
@@ -1846,12 +1846,12 @@
 
   // Even though we exceeded the input priority escalation period, we should
   // still be in main thread gesture since the input remains queued.
-  EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING, CurrentUseCase());
+  EXPECT_EQ(UseCase::kMainThreadCustomInputHandling, CurrentUseCase());
 
   // After the escalation period ends we should go back into normal mode.
   clock_->Advance(priority_escalation_after_input_duration() * 2);
   RunUntilIdle();
-  EXPECT_EQ(UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, CurrentUseCase());
 }
 
 class RendererSchedulerImplWithMockSchedulerTest
@@ -2035,7 +2035,7 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   EXPECT_EQ(1, mock_scheduler_->update_policy_count_);
 
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
 
   // We expect the first call to IsHighPriorityWorkAnticipated to be called
   // after receiving an input event (but before the UpdateTask was processed) to
@@ -2623,7 +2623,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_FALSE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2638,7 +2638,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2658,7 +2658,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2680,7 +2680,7 @@
   PostTestTasks(&run_order, "T1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_FALSE(LoadingTasksSeemExpensive());
   EXPECT_TRUE(TimerTasksSeemExpensive());
@@ -2697,9 +2697,9 @@
   DoMainFrame();
   SimulateExpensiveTasks(timer_task_runner_);
 
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
-  EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(UseCase::kMainThreadCustomInputHandling,
             ForceUpdatePolicyAndGetCurrentUseCase());
 
   scheduler_->DidHandleInputEventOnCompositorThread(
@@ -2710,12 +2710,12 @@
       WebInputEventResult::kHandledSystem);
 
   clock_->Advance(priority_escalation_after_input_duration() * 2);
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
 
   PostTestTasks(&run_order, "T1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_FALSE(LoadingTasksSeemExpensive());
   EXPECT_TRUE(TimerTasksSeemExpensive());
@@ -2726,7 +2726,7 @@
 }
 
 TEST_F(RendererSchedulerImplTest,
-       ExpensiveTimerTaskBlocked_UseCase_COMPOSITOR_GESTURE) {
+       ExpensiveTimerTaskBlocked_UseCase_kCompositorGesture) {
   std::vector<std::string> run_order;
 
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
@@ -2738,7 +2738,7 @@
   PostTestTasks(&run_order, "T1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_FALSE(LoadingTasksSeemExpensive());
@@ -2761,7 +2761,7 @@
   PostTestTasks(&run_order, "T1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_FALSE(LoadingTasksSeemExpensive());
   EXPECT_TRUE(TimerTasksSeemExpensive());
@@ -2803,7 +2803,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2821,7 +2821,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2847,7 +2847,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2864,7 +2864,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2881,7 +2881,7 @@
   PostTestTasks(&run_order, "L1 D1");
   RunUntilIdle();
 
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kNone, CurrentUseCase());
   EXPECT_TRUE(HaveSeenABeginMainframe());
   EXPECT_TRUE(LoadingTasksSeemExpensive());
   EXPECT_FALSE(TimerTasksSeemExpensive());
@@ -2901,10 +2901,10 @@
   PostTestTasks(&run_order, "C1 L1");
 
   // Trigger main_thread_gesture UseCase
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
   RunUntilIdle();
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
             CurrentUseCase());
 
   EXPECT_TRUE(LoadingTasksSeemExpensive());
@@ -2916,7 +2916,7 @@
 
 TEST_F(RendererSchedulerImplTest, ModeratelyExpensiveTimer_NotBlocked) {
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kTouchMove);
   RunUntilIdle();
   for (int i = 0; i < 20; i++) {
@@ -2941,7 +2941,7 @@
 
     RunUntilIdle();
     EXPECT_TRUE(simulate_timer_task_ran_) << " i = " << i;
-    EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+    EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
               CurrentUseCase())
         << " i = " << i;
     EXPECT_FALSE(LoadingTasksSeemExpensive()) << " i = " << i;
@@ -2981,7 +2981,7 @@
 
     RunUntilIdle();
     EXPECT_TRUE(simulate_timer_task_ran_) << " i = " << i;
-    EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+    EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
               CurrentUseCase())
         << " i = " << i;
     EXPECT_FALSE(LoadingTasksSeemExpensive()) << " i = " << i;
@@ -2997,7 +2997,7 @@
 TEST_F(RendererSchedulerImplTest,
        ExpensiveTimer_NotBlocked_UseCase_MAIN_THREAD_CUSTOM_INPUT_HANDLING) {
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kTouchMove);
   RunUntilIdle();
   for (int i = 0; i < 20; i++) {
@@ -3021,7 +3021,7 @@
                               base::TimeDelta::FromMilliseconds(10)));
 
     RunUntilIdle();
-    EXPECT_EQ(RendererSchedulerImpl::UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING,
+    EXPECT_EQ(RendererSchedulerImpl::UseCase::kMainThreadCustomInputHandling,
               CurrentUseCase())
         << " i = " << i;
     EXPECT_FALSE(LoadingTasksSeemExpensive()) << " i = " << i;
@@ -3041,15 +3041,15 @@
 
 TEST_F(RendererSchedulerImplTest,
        EstimateLongestJankFreeTaskDuration_UseCase_NONE) {
-  EXPECT_EQ(UseCase::NONE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, CurrentUseCase());
   EXPECT_EQ(rails_response_time(),
             scheduler_->EstimateLongestJankFreeTaskDuration());
 }
 
 TEST_F(RendererSchedulerImplTest,
-       EstimateLongestJankFreeTaskDuration_UseCase_COMPOSITOR_GESTURE) {
-  SimulateCompositorGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START);
-  EXPECT_EQ(UseCase::COMPOSITOR_GESTURE,
+       EstimateLongestJankFreeTaskDuration_UseCase_kCompositorGesture) {
+  SimulateCompositorGestureStart(TouchEventPolicy::kDontSendTouchStart);
+  EXPECT_EQ(UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(rails_response_time(),
             scheduler_->EstimateLongestJankFreeTaskDuration());
@@ -3059,14 +3059,14 @@
 TEST_F(RendererSchedulerImplTest,
        DISABLED_EstimateLongestJankFreeTaskDuration_UseCase_) {
   scheduler_->DidStartProvisionalLoad(true);
-  EXPECT_EQ(UseCase::LOADING, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kLoading, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(rails_response_time(),
             scheduler_->EstimateLongestJankFreeTaskDuration());
 }
 
 TEST_F(RendererSchedulerImplTest,
        EstimateLongestJankFreeTaskDuration_UseCase_MAIN_THREAD_GESTURE) {
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollUpdate);
   viz::BeginFrameArgs begin_frame_args = viz::BeginFrameArgs::Create(
       BEGINFRAME_FROM_HERE, 0, next_begin_frame_number_++, clock_->NowTicks(),
@@ -3082,7 +3082,7 @@
                  base::Unretained(this), base::TimeDelta::FromMilliseconds(5)));
 
   RunUntilIdle();
-  EXPECT_EQ(UseCase::MAIN_THREAD_GESTURE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kMainThreadGesture, CurrentUseCase());
 
   // 16ms frame - 5ms compositor work = 11ms for other stuff.
   EXPECT_EQ(base::TimeDelta::FromMilliseconds(11),
@@ -3106,7 +3106,7 @@
                  base::Unretained(this), base::TimeDelta::FromMilliseconds(5)));
 
   RunUntilIdle();
-  EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING, CurrentUseCase());
+  EXPECT_EQ(UseCase::kMainThreadCustomInputHandling, CurrentUseCase());
 
   // 16ms frame - 5ms compositor work = 11ms for other stuff.
   EXPECT_EQ(base::TimeDelta::FromMilliseconds(11),
@@ -3115,7 +3115,7 @@
 
 TEST_F(RendererSchedulerImplTest,
        EstimateLongestJankFreeTaskDuration_UseCase_SYNCHRONIZED_GESTURE) {
-  SimulateCompositorGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kDontSendTouchStart);
 
   viz::BeginFrameArgs begin_frame_args = viz::BeginFrameArgs::Create(
       BEGINFRAME_FROM_HERE, 0, next_begin_frame_number_++, clock_->NowTicks(),
@@ -3130,7 +3130,7 @@
                  base::Unretained(this), base::TimeDelta::FromMilliseconds(5)));
 
   RunUntilIdle();
-  EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE, CurrentUseCase());
+  EXPECT_EQ(UseCase::kSynchronizedGesture, CurrentUseCase());
 
   // 16ms frame - 5ms compositor work = 11ms for other stuff.
   EXPECT_EQ(base::TimeDelta::FromMilliseconds(11),
@@ -3165,7 +3165,7 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   DoMainFrame();
   SimulateExpensiveTasks(timer_task_runner_);
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
   ForceTouchStartToBeExpectedSoon();
 
   std::vector<std::string> run_order;
@@ -3187,7 +3187,7 @@
   auto pause_handle = scheduler_->PauseRenderer();
   DoMainFrame();
   SimulateExpensiveTasks(timer_task_runner_);
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
   ForceTouchStartToBeExpectedSoon();
 
   std::vector<std::string> run_order;
@@ -3205,11 +3205,11 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   DoMainFrame();
   SimulateExpensiveTasks(timer_task_runner_);
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kTouchStart),
       RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
-  EXPECT_EQ(UseCase::TOUCHSTART, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kTouchstart, ForceUpdatePolicyAndGetCurrentUseCase());
 
   std::vector<std::string> run_order;
   PostTestTasks(&run_order, "T1 T2");
@@ -3227,7 +3227,7 @@
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   DoMainFrame();
   SimulateExpensiveTasks(timer_task_runner_);
-  SimulateCompositorGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kDontSendTouchStart);
 
   viz::BeginFrameArgs begin_frame_args = viz::BeginFrameArgs::Create(
       BEGINFRAME_FROM_HERE, 0, next_begin_frame_number_++, clock_->NowTicks(),
@@ -3236,7 +3236,7 @@
   begin_frame_args.on_critical_path = true;
   scheduler_->WillBeginFrame(begin_frame_args);
 
-  EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE,
+  EXPECT_EQ(UseCase::kSynchronizedGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
 
   std::vector<std::string> run_order;
@@ -3258,9 +3258,9 @@
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kMouseWheel),
       RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
-  SimulateCompositorGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kDontSendTouchStart);
 
-  EXPECT_EQ(UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
   ForceTouchStartToBeExpectedSoon();
 
@@ -3287,7 +3287,7 @@
 
 TEST_F(RendererSchedulerImplTest,
        SYNCHRONIZED_GESTURE_TimerTaskThrottling_task_expensive) {
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
 
   base::TimeTicks first_throttled_run_time =
       TaskQueueThrottler::AlignedThrottledRunTime(clock_->NowTicks());
@@ -3320,7 +3320,7 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE, CurrentUseCase()) << "i = " << i;
+    EXPECT_EQ(UseCase::kSynchronizedGesture, CurrentUseCase()) << "i = " << i;
 
     // We expect the queue to get throttled on the second iteration which is
     // when the system realizes the task is expensive.
@@ -3350,7 +3350,7 @@
 
 TEST_F(RendererSchedulerImplTest,
        SYNCHRONIZED_GESTURE_TimerTaskThrottling_TimersStopped) {
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
 
   base::TimeTicks first_throttled_run_time =
       TaskQueueThrottler::AlignedThrottledRunTime(clock_->NowTicks());
@@ -3384,7 +3384,7 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE, CurrentUseCase()) << "i = " << i;
+    EXPECT_EQ(UseCase::kSynchronizedGesture, CurrentUseCase()) << "i = " << i;
 
     // Before the policy is updated the queue will be enabled. Subsequently it
     // will be disabled until the throttled queue is pumped.
@@ -3411,7 +3411,7 @@
 
 TEST_F(RendererSchedulerImplTest,
        SYNCHRONIZED_GESTURE_TimerTaskThrottling_task_not_expensive) {
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
 
   size_t count = 0;
   // With the compositor task taking 10ms, there is enough time to run this 6ms
@@ -3441,7 +3441,7 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE, CurrentUseCase()) << "i = " << i;
+    EXPECT_EQ(UseCase::kSynchronizedGesture, CurrentUseCase()) << "i = " << i;
     EXPECT_TRUE(scheduler_->TimerTaskQueue()->IsQueueEnabled()) << "i = " << i;
   }
 
@@ -3452,7 +3452,7 @@
 TEST_F(RendererSchedulerImplTest,
        ExpensiveTimerTaskBlocked_SYNCHRONIZED_GESTURE_TouchStartExpected) {
   SimulateExpensiveTasks(timer_task_runner_);
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   ForceTouchStartToBeExpectedSoon();
 
@@ -3468,7 +3468,7 @@
   begin_frame_args.on_critical_path = true;
   scheduler_->WillBeginFrame(begin_frame_args);
 
-  EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE,
+  EXPECT_EQ(UseCase::kSynchronizedGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
 
   EXPECT_TRUE(TimerTasksSeemExpensive());
@@ -3480,7 +3480,7 @@
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kTouchStart),
       RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
-  EXPECT_EQ(UseCase::TOUCHSTART, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kTouchstart, ForceUpdatePolicyAndGetCurrentUseCase());
 
   // First check that long idle is denied during the TOUCHSTART use case.
   IdleHelper::Delegate* idle_delegate = scheduler_.get();
@@ -3501,19 +3501,19 @@
   scheduler_->DidAnimateForInputOnCompositorThread();
   // Note DidAnimateForInputOnCompositorThread does not by itself trigger a
   // policy update.
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
 
   // Make sure TouchStart causes a policy change.
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kTouchStart),
       RendererScheduler::InputEventState::EVENT_FORWARDED_TO_MAIN_THREAD);
-  EXPECT_EQ(RendererSchedulerImpl::UseCase::TOUCHSTART,
+  EXPECT_EQ(RendererSchedulerImpl::UseCase::kTouchstart,
             ForceUpdatePolicyAndGetCurrentUseCase());
 }
 
 TEST_F(RendererSchedulerImplTest, SYNCHRONIZED_GESTURE_CompositingExpensive) {
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
 
   // With the compositor task taking 20ms, there is not enough time to run
   // other tasks in the same 16ms frame. To avoid starvation, compositing tasks
@@ -3543,18 +3543,18 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE, CurrentUseCase()) << "i = " << i;
+    EXPECT_EQ(UseCase::kSynchronizedGesture, CurrentUseCase()) << "i = " << i;
   }
 
   // Timer tasks should not have been starved by the expensive compositor
   // tasks.
-  EXPECT_EQ(TaskQueue::NORMAL_PRIORITY,
+  EXPECT_EQ(TaskQueue::kNormalPriority,
             scheduler_->CompositorTaskQueue()->GetQueuePriority());
   EXPECT_EQ(1000u, run_order.size());
 }
 
 TEST_F(RendererSchedulerImplTest, MAIN_THREAD_CUSTOM_INPUT_HANDLING) {
-  SimulateMainThreadGestureStart(TouchEventPolicy::SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
 
   // With the compositor task taking 20ms, there is not enough time to run
@@ -3585,19 +3585,19 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::MAIN_THREAD_CUSTOM_INPUT_HANDLING, CurrentUseCase())
+    EXPECT_EQ(UseCase::kMainThreadCustomInputHandling, CurrentUseCase())
         << "i = " << i;
   }
 
   // Timer tasks should not have been starved by the expensive compositor
   // tasks.
-  EXPECT_EQ(TaskQueue::NORMAL_PRIORITY,
+  EXPECT_EQ(TaskQueue::kNormalPriority,
             scheduler_->CompositorTaskQueue()->GetQueuePriority());
   EXPECT_EQ(1000u, run_order.size());
 }
 
 TEST_F(RendererSchedulerImplTest, MAIN_THREAD_GESTURE) {
-  SimulateMainThreadGestureStart(TouchEventPolicy::DONT_SEND_TOUCH_START,
+  SimulateMainThreadGestureStart(TouchEventPolicy::kDontSendTouchStart,
                                  blink::WebInputEvent::kGestureScrollBegin);
 
   // With the compositor task taking 20ms, there is not enough time to run
@@ -3629,10 +3629,10 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::MAIN_THREAD_GESTURE, CurrentUseCase()) << "i = " << i;
+    EXPECT_EQ(UseCase::kMainThreadGesture, CurrentUseCase()) << "i = " << i;
   }
 
-  EXPECT_EQ(TaskQueue::HIGH_PRIORITY,
+  EXPECT_EQ(TaskQueue::kHighPriority,
             scheduler_->CompositorTaskQueue()->GetQueuePriority());
   EXPECT_EQ(279u, run_order.size());
 }
@@ -3649,7 +3649,7 @@
 
   scheduler_->SetHasVisibleRenderWidgetWithTouchHandler(true);
   ForceTouchStartToBeExpectedSoon();
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(v8::PERFORMANCE_RESPONSE, GetRAILMode());
   scheduler_->SetRAILModeObserver(nullptr);
 }
@@ -3660,7 +3660,7 @@
   EXPECT_CALL(observer, OnRAILModeChanged(v8::PERFORMANCE_ANIMATION)).Times(0);
 
   EXPECT_FALSE(BeginFrameNotExpectedSoon());
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(v8::PERFORMANCE_ANIMATION, GetRAILMode());
   scheduler_->SetRAILModeObserver(nullptr);
 }
@@ -3672,10 +3672,10 @@
   EXPECT_CALL(observer, OnRAILModeChanged(v8::PERFORMANCE_IDLE));
 
   scheduler_->SetAllRenderWidgetsHidden(true);
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(v8::PERFORMANCE_IDLE, GetRAILMode());
   scheduler_->SetAllRenderWidgetsHidden(false);
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(v8::PERFORMANCE_ANIMATION, GetRAILMode());
   scheduler_->SetRAILModeObserver(nullptr);
 }
@@ -3688,9 +3688,9 @@
 
   scheduler_->DidStartProvisionalLoad(true);
   EXPECT_EQ(v8::PERFORMANCE_LOAD, GetRAILMode());
-  EXPECT_EQ(UseCase::LOADING, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kLoading, ForceUpdatePolicyAndGetCurrentUseCase());
   scheduler_->OnFirstMeaningfulPaint();
-  EXPECT_EQ(UseCase::NONE, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kNone, ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(v8::PERFORMANCE_ANIMATION, GetRAILMode());
   scheduler_->SetRAILModeObserver(nullptr);
 }
@@ -3703,14 +3703,14 @@
 
   scheduler_->DidStartProvisionalLoad(true);
   EXPECT_EQ(v8::PERFORMANCE_LOAD, GetRAILMode());
-  EXPECT_EQ(UseCase::LOADING, ForceUpdatePolicyAndGetCurrentUseCase());
+  EXPECT_EQ(UseCase::kLoading, ForceUpdatePolicyAndGetCurrentUseCase());
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kGestureScrollBegin),
       RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
   scheduler_->DidHandleInputEventOnCompositorThread(
       FakeInputEvent(blink::WebInputEvent::kGestureScrollUpdate),
       RendererScheduler::InputEventState::EVENT_CONSUMED_BY_COMPOSITOR);
-  EXPECT_EQ(UseCase::COMPOSITOR_GESTURE,
+  EXPECT_EQ(UseCase::kCompositorGesture,
             ForceUpdatePolicyAndGetCurrentUseCase());
   EXPECT_EQ(v8::PERFORMANCE_ANIMATION, GetRAILMode());
   scheduler_->SetRAILModeObserver(nullptr);
@@ -3719,10 +3719,10 @@
 TEST_F(RendererSchedulerImplTest, UnthrottledTaskRunner) {
   // Ensure neither suspension nor timer task throttling affects an unthrottled
   // task runner.
-  SimulateCompositorGestureStart(TouchEventPolicy::SEND_TOUCH_START);
+  SimulateCompositorGestureStart(TouchEventPolicy::kSendTouchStart);
   scoped_refptr<TaskQueue> unthrottled_task_runner =
       scheduler_->NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-          MainThreadTaskQueue::QueueType::UNTHROTTLED));
+          MainThreadTaskQueue::QueueType::kUnthrottled));
 
   size_t timer_count = 0;
   size_t unthrottled_count = 0;
@@ -3755,7 +3755,7 @@
     mock_task_runner_->RunTasksWhile(
         base::Bind(&RendererSchedulerImplTest::SimulatedCompositorTaskPending,
                    base::Unretained(this)));
-    EXPECT_EQ(UseCase::SYNCHRONIZED_GESTURE, CurrentUseCase()) << "i = " << i;
+    EXPECT_EQ(UseCase::kSynchronizedGesture, CurrentUseCase()) << "i = " << i;
   }
 
   EXPECT_EQ(0u, timer_count);
@@ -3767,14 +3767,14 @@
 
   scoped_refptr<MainThreadTaskQueue> loading_tq =
       scheduler_->NewLoadingTaskQueue(
-          MainThreadTaskQueue::QueueType::FRAME_LOADING);
+          MainThreadTaskQueue::QueueType::kFrameLoading);
   scoped_refptr<TaskQueue> loading_control_tq = scheduler_->NewLoadingTaskQueue(
-      MainThreadTaskQueue::QueueType::FRAME_LOADING_CONTROL);
+      MainThreadTaskQueue::QueueType::kFrameLoading_kControl);
   scoped_refptr<MainThreadTaskQueue> timer_tq = scheduler_->NewTimerTaskQueue(
-      MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+      MainThreadTaskQueue::QueueType::kFrameThrottleable);
   scoped_refptr<MainThreadTaskQueue> unthrottled_tq =
       scheduler_->NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-          MainThreadTaskQueue::QueueType::UNTHROTTLED));
+          MainThreadTaskQueue::QueueType::kUnthrottled));
 
   EXPECT_EQ(scheduler_->DefaultTaskQueue()->GetTimeDomain(),
             scheduler_->GetVirtualTimeDomain());
@@ -3786,7 +3786,7 @@
             scheduler_->GetVirtualTimeDomain());
   EXPECT_EQ(scheduler_->VirtualTimeControlTaskQueue()->GetTimeDomain(),
             scheduler_->GetVirtualTimeDomain());
-  EXPECT_EQ(scheduler_->V8TaskQueue()->GetTimeDomain(),
+  EXPECT_EQ(scheduler_->kV8TaskQueue()->GetTimeDomain(),
             scheduler_->GetVirtualTimeDomain());
 
   // The main control task queue remains in the real time domain.
@@ -3802,22 +3802,22 @@
 
   EXPECT_EQ(
       scheduler_
-          ->NewLoadingTaskQueue(MainThreadTaskQueue::QueueType::FRAME_LOADING)
+          ->NewLoadingTaskQueue(MainThreadTaskQueue::QueueType::kFrameLoading)
           ->GetTimeDomain(),
       scheduler_->GetVirtualTimeDomain());
   EXPECT_EQ(scheduler_
                 ->NewTimerTaskQueue(
-                    MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE)
+                    MainThreadTaskQueue::QueueType::kFrameThrottleable)
                 ->GetTimeDomain(),
             scheduler_->GetVirtualTimeDomain());
   EXPECT_EQ(scheduler_
                 ->NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-                    MainThreadTaskQueue::QueueType::UNTHROTTLED))
+                    MainThreadTaskQueue::QueueType::kUnthrottled))
                 ->GetTimeDomain(),
             scheduler_->GetVirtualTimeDomain());
   EXPECT_EQ(scheduler_
                 ->NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-                    MainThreadTaskQueue::QueueType::TEST))
+                    MainThreadTaskQueue::QueueType::kTest))
                 ->GetTimeDomain(),
             scheduler_->GetVirtualTimeDomain());
 }
@@ -3848,10 +3848,10 @@
   scheduler_->EnableVirtualTime();
 
   scoped_refptr<MainThreadTaskQueue> timer_tq = scheduler_->NewTimerTaskQueue(
-      MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+      MainThreadTaskQueue::QueueType::kFrameThrottleable);
   scoped_refptr<MainThreadTaskQueue> unthrottled_tq =
       scheduler_->NewTaskQueue(MainThreadTaskQueue::QueueCreationParams(
-          MainThreadTaskQueue::QueueType::UNTHROTTLED));
+          MainThreadTaskQueue::QueueType::kUnthrottled));
 
   scheduler_->DisableVirtualTimeForTesting();
   EXPECT_EQ(scheduler_->DefaultTaskQueue()->GetTimeDomain(),
@@ -3864,7 +3864,7 @@
             scheduler_->real_time_domain());
   EXPECT_EQ(scheduler_->ControlTaskQueue()->GetTimeDomain(),
             scheduler_->real_time_domain());
-  EXPECT_EQ(scheduler_->V8TaskQueue()->GetTimeDomain(),
+  EXPECT_EQ(scheduler_->kV8TaskQueue()->GetTimeDomain(),
             scheduler_->real_time_domain());
   EXPECT_FALSE(scheduler_->VirtualTimeControlTaskQueue());
 }
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.cc
index ccf8ce0..acce1f0 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_web_scheduler_impl.cc
@@ -21,7 +21,7 @@
                        renderer_scheduler->IdleTaskRunner(),
                        renderer_scheduler->LoadingTaskQueue(),
                        renderer_scheduler->TimerTaskQueue(),
-                       renderer_scheduler->V8TaskQueue()),
+                       renderer_scheduler->kV8TaskQueue()),
       renderer_scheduler_(renderer_scheduler),
       compositor_task_runner_(WebTaskRunnerImpl::Create(
           renderer_scheduler_->CompositorTaskQueue())) {}
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/task_duration_metric_reporter.h b/third_party/WebKit/Source/platform/scheduler/renderer/task_duration_metric_reporter.h
index feab76f..df13291 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/task_duration_metric_reporter.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/task_duration_metric_reporter.h
@@ -33,14 +33,15 @@
       : TaskDurationMetricReporter(base::Histogram::FactoryGet(
             metric_name,
             1,
-            static_cast<int>(TaskClass::COUNT),
-            static_cast<int>(TaskClass::COUNT) + 1,
+            static_cast<int>(TaskClass::kCount),
+            static_cast<int>(TaskClass::kCount) + 1,
             base::HistogramBase::kUmaTargetedHistogramFlag)) {}
 
   ~TaskDurationMetricReporter() {}
 
   void RecordTask(TaskClass task_class, base::TimeDelta duration) {
-    DCHECK_LT(static_cast<int>(task_class), static_cast<int>(TaskClass::COUNT));
+    DCHECK_LT(static_cast<int>(task_class),
+              static_cast<int>(TaskClass::kCount));
     // Report only whole milliseconds to avoid overflow.
     base::TimeDelta& unreported_duration =
         unreported_task_duration_[static_cast<int>(task_class)];
@@ -59,7 +60,7 @@
   TaskDurationMetricReporter(base::HistogramBase* histogram)
       : task_duration_per_queue_type_histogram_(histogram) {}
 
-  std::array<base::TimeDelta, static_cast<size_t>(TaskClass::COUNT)>
+  std::array<base::TimeDelta, static_cast<size_t>(TaskClass::kCount)>
       unreported_task_duration_;
   base::HistogramBase* task_duration_per_queue_type_histogram_;
 
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.cc b/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.cc
index 7e0a0083..0feda19 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler.cc
@@ -120,7 +120,7 @@
   task_queue->SetTimeDomain(time_domain_.get());
   // This blocks any tasks from |task_queue| until PumpThrottledTasks() to
   // enforce task alignment.
-  task_queue->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
+  task_queue->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
 
   if (!task_queue->IsQueueEnabled())
     return;
@@ -331,7 +331,7 @@
     if (!unblock_until || unblock_until.value() > now) {
       queue->InsertFenceAt(unblock_until.value());
     } else if (unblock_until.value() == now) {
-      queue->InsertFence(TaskQueue::InsertFencePosition::NOW);
+      queue->InsertFence(TaskQueue::InsertFencePosition::kNow);
     } else {
       DCHECK_GE(unblock_until.value(), now);
     }
@@ -365,7 +365,7 @@
 
   switch (block_type.value()) {
     case QueueBlockType::kAllTasks:
-      queue->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
+      queue->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
 
       {
         // Braces limit the scope for a declared variable. Does not compile
@@ -381,7 +381,7 @@
       if (!queue->HasActiveFence()) {
         // Insert a new non-fully blocking fence only when there is no fence
         // already in order avoid undesired unblocking of old tasks.
-        queue->InsertFence(TaskQueue::InsertFencePosition::NOW);
+        queue->InsertFence(TaskQueue::InsertFencePosition::kNow);
       }
       break;
   }
@@ -561,7 +561,7 @@
 
     // Throttling is enabled and task queue should be blocked immediately
     // to enforce task alignment.
-    queue->InsertFence(TaskQueue::InsertFencePosition::BEGINNING_OF_TIME);
+    queue->InsertFence(TaskQueue::InsertFencePosition::kBeginningOfTime);
     queue->SetTimeDomain(time_domain_.get());
     UpdateQueueThrottlingState(lazy_now.Now(), queue);
   }
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler_unittest.cc
index f246846..8c0fa75 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/task_queue_throttler_unittest.cc
@@ -85,7 +85,7 @@
     scheduler_.reset(new RendererSchedulerImpl(delegate_));
     task_queue_throttler_ = scheduler_->task_queue_throttler();
     timer_queue_ = scheduler_->NewTimerTaskQueue(
-        MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+        MainThreadTaskQueue::QueueType::kFrameThrottleable);
   }
 
   void TearDown() override {
@@ -122,7 +122,7 @@
       return true;
     return task_queue_impl->GetFenceForTest() ==
            static_cast<internal::EnqueueOrder>(
-               internal::EnqueueOrderValues::BLOCKING_FENCE);
+               internal::EnqueueOrderValues::kBlockingFence);
   }
 
  protected:
@@ -740,7 +740,7 @@
   std::vector<base::TimeTicks> run_times;
 
   scoped_refptr<TaskQueue> second_queue = scheduler_->NewTimerTaskQueue(
-      MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+      MainThreadTaskQueue::QueueType::kFrameThrottleable);
 
   CPUTimeBudgetPool* pool =
       task_queue_throttler_->CreateCPUTimeBudgetPool("test");
@@ -1066,7 +1066,7 @@
 
   scoped_refptr<MainThreadTaskQueue> second_queue =
       scheduler_->NewTimerTaskQueue(
-          MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+          MainThreadTaskQueue::QueueType::kFrameThrottleable);
 
   task_queue_throttler_->IncreaseThrottleRefCount(timer_queue_.get());
   task_queue_throttler_->IncreaseThrottleRefCount(second_queue.get());
@@ -1102,7 +1102,7 @@
   std::vector<base::TimeTicks> run_times;
 
   scoped_refptr<TaskQueue> second_queue = scheduler_->NewTimerTaskQueue(
-      MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE);
+      MainThreadTaskQueue::QueueType::kFrameThrottleable);
 
   CPUTimeBudgetPool* pool1 =
       task_queue_throttler_->CreateCPUTimeBudgetPool("test");
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
index 04479ea..2bb8546 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_frame_scheduler_impl.cc
@@ -267,7 +267,7 @@
   DCHECK(parent_web_view_scheduler_);
   if (!loading_task_queue_) {
     loading_task_queue_ = renderer_scheduler_->NewLoadingTaskQueue(
-        MainThreadTaskQueue::QueueType::FRAME_LOADING);
+        MainThreadTaskQueue::QueueType::kFrameLoading);
     loading_task_queue_->SetBlameContext(blame_context_);
     loading_task_queue_->SetFrameScheduler(this);
     loading_queue_enabled_voter_ =
@@ -281,7 +281,7 @@
   DCHECK(parent_web_view_scheduler_);
   if (!loading_control_task_queue_) {
     loading_control_task_queue_ = renderer_scheduler_->NewLoadingTaskQueue(
-        MainThreadTaskQueue::QueueType::FRAME_LOADING_CONTROL);
+        MainThreadTaskQueue::QueueType::kFrameLoading_kControl);
     loading_control_task_queue_->SetBlameContext(blame_context_);
     loading_control_task_queue_->SetFrameScheduler(this);
     loading_control_queue_enabled_voter_ =
@@ -296,7 +296,7 @@
   if (!throttleable_task_queue_) {
     throttleable_task_queue_ = renderer_scheduler_->NewTaskQueue(
         MainThreadTaskQueue::QueueCreationParams(
-            MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE)
+            MainThreadTaskQueue::QueueType::kFrameThrottleable)
             .SetShouldReportWhenExecutionBlocked(true)
             .SetCanBeThrottled(true)
             .SetCanBeStopped(true)
@@ -328,7 +328,7 @@
   if (!deferrable_task_queue_) {
     deferrable_task_queue_ = renderer_scheduler_->NewTaskQueue(
         MainThreadTaskQueue::QueueCreationParams(
-            MainThreadTaskQueue::QueueType::FRAME_THROTTLEABLE)
+            MainThreadTaskQueue::QueueType::kFrameThrottleable)
             .SetShouldReportWhenExecutionBlocked(true)
             .SetCanBeDeferred(true)
             .SetCanBePaused(true));
@@ -346,7 +346,7 @@
   if (!pausable_task_queue_) {
     pausable_task_queue_ = renderer_scheduler_->NewTaskQueue(
         MainThreadTaskQueue::QueueCreationParams(
-            MainThreadTaskQueue::QueueType::FRAME_PAUSABLE)
+            MainThreadTaskQueue::QueueType::kFramePausable)
             .SetShouldReportWhenExecutionBlocked(true)
             .SetCanBePaused(true));
     pausable_task_queue_->SetBlameContext(blame_context_);
@@ -363,7 +363,7 @@
   if (!unpausable_task_queue_) {
     unpausable_task_queue_ = renderer_scheduler_->NewTaskQueue(
         MainThreadTaskQueue::QueueCreationParams(
-            MainThreadTaskQueue::QueueType::FRAME_UNPAUSABLE));
+            MainThreadTaskQueue::QueueType::kFrameUnpausable));
     unpausable_task_queue_->SetBlameContext(blame_context_);
     unpausable_task_queue_->SetFrameScheduler(this);
   }
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
index 23974ca..00d91ef 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler.h
@@ -61,20 +61,20 @@
     // runs out of immediate work, the virtual timebase will be incremented so
     // that the next sceduled timer may fire.  NOTE Tasks will be run in time
     // order (as usual).
-    ADVANCE,
+    kAdvance,
 
     // In this policy virtual time is not allowed to advance. Delayed tasks
     // posted to WebTaskRunners owned by any child WebFrameSchedulers will be
     // paused, unless their scheduled run time is less than or equal to the
     // current virtual time.  Note non-delayed tasks will run as normal.
-    PAUSE,
+    kPause,
 
     // In this policy virtual time is allowed to advance unless there are
     // pending network fetches associated any child WebFrameScheduler, or a
     // document is being parsed on a background thread. Initially virtual time
     // is not allowed to advance until we have seen at least one load. The aim
     // being to try and make loading (more) deterministic.
-    DETERMINISTIC_LOADING
+    kDeterministicLoading,
   };
 
   // Sets the virtual time policy, which is applied imemdiatly to all child
@@ -111,7 +111,7 @@
   // It's possible for pages to send infinite messages which can arbitrarily
   // block virtual time.  We can prevent this by setting an upper limit on the
   // number of tasks that can run before virtual time is advanced.
-  // NB this anti-starvation logic doesn't apply to VirtualTimePolicy::PAUSE.
+  // NB this anti-starvation logic doesn't apply to VirtualTimePolicy::kPause.
   virtual void SetMaxVirtualTimeTaskStarvationCount(
       int max_task_starvation_count) = 0;
 
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl_unittest.cc b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl_unittest.cc
index 324823c..00c398a4 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl_unittest.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/web_view_scheduler_impl_unittest.cc
@@ -339,7 +339,7 @@
 TEST_F(WebViewSchedulerImplTest, VirtualTime_NotAllowedToAdvance) {
   std::vector<int> run_order;
 
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
   web_view_scheduler_->EnableVirtualTime();
 
   ThrottleableTaskQueue()->PostTask(
@@ -367,7 +367,7 @@
 TEST_F(WebViewSchedulerImplTest, VirtualTime_AllowedToAdvance) {
   std::vector<int> run_order;
 
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kAdvance);
   web_view_scheduler_->EnableVirtualTime();
 
   ThrottleableTaskQueue()->PostTask(
@@ -416,7 +416,7 @@
 TEST_F(WebViewSchedulerImplTest, VirtualTimeSettings_NewWebFrameScheduler) {
   std::vector<int> run_order;
 
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
   web_view_scheduler_->EnableVirtualTime();
 
   std::unique_ptr<WebFrameSchedulerImpl> web_frame_scheduler =
@@ -432,7 +432,7 @@
   mock_task_runner_->RunUntilIdle();
   EXPECT_TRUE(run_order.empty());
 
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kAdvance);
   mock_task_runner_->RunUntilIdle();
 
   EXPECT_THAT(run_order, ElementsAre(1));
@@ -497,7 +497,7 @@
 
 TEST_F(WebViewSchedulerImplTest, VirtualTimePauseCount_DETERMINISTIC_LOADING) {
   web_view_scheduler_->SetVirtualTimePolicy(
-      VirtualTimePolicy::DETERMINISTIC_LOADING);
+      VirtualTimePolicy::kDeterministicLoading);
   EXPECT_TRUE(scheduler_->VirtualTimeAllowedToAdvance());
 
   scheduler_->IncrementVirtualTimePauseCount();
@@ -522,7 +522,7 @@
 TEST_F(WebViewSchedulerImplTest,
        ScopedVirtualTimePauser_DETERMINISTIC_LOADING) {
   web_view_scheduler_->SetVirtualTimePolicy(
-      VirtualTimePolicy::DETERMINISTIC_LOADING);
+      VirtualTimePolicy::kDeterministicLoading);
 
   std::unique_ptr<WebFrameSchedulerImpl> web_frame_scheduler =
       web_view_scheduler_->CreateWebFrameSchedulerImpl(
@@ -549,7 +549,7 @@
 TEST_F(WebViewSchedulerImplTest,
        MultipleScopedVirtualTimePausers_DETERMINISTIC_LOADING) {
   web_view_scheduler_->SetVirtualTimePolicy(
-      VirtualTimePolicy::DETERMINISTIC_LOADING);
+      VirtualTimePolicy::kDeterministicLoading);
 
   std::unique_ptr<WebFrameSchedulerImpl> web_frame_scheduler =
       web_view_scheduler_->CreateWebFrameSchedulerImpl(
@@ -575,7 +575,7 @@
 
 TEST_F(WebViewSchedulerImplTest, NestedMessageLoop_DETERMINISTIC_LOADING) {
   web_view_scheduler_->SetVirtualTimePolicy(
-      VirtualTimePolicy::DETERMINISTIC_LOADING);
+      VirtualTimePolicy::kDeterministicLoading);
   EXPECT_TRUE(scheduler_->VirtualTimeAllowedToAdvance());
 
   scheduler_->OnBeginNestedRunLoop();
@@ -591,7 +591,7 @@
   std::unique_ptr<WebFrameSchedulerImpl> web_frame_scheduler =
       web_view_scheduler_->CreateWebFrameSchedulerImpl(
           nullptr, WebFrameScheduler::FrameType::kSubframe);
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
   web_view_scheduler_->EnableVirtualTime();
 
   ThrottleableTaskQueueForScheduler(web_frame_scheduler.get())
@@ -601,7 +601,7 @@
   mock_task_runner_->RunUntilIdle();
   EXPECT_TRUE(run_order.empty());
 
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kAdvance);
   mock_task_runner_->RunUntilIdle();
 
   EXPECT_THAT(run_order, ElementsAre(1));
@@ -645,7 +645,7 @@
       base::TimeDelta::FromMilliseconds(5),
       WTF::Bind(
           [](WebViewScheduler* scheduler) {
-            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
           },
           WTF::Unretained(web_view_scheduler_.get())));
 
@@ -706,7 +706,7 @@
       base::TimeDelta::FromMilliseconds(1000),
       WTF::Bind(
           [](WebViewScheduler* scheduler) {
-            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
           },
           WTF::Unretained(web_view_scheduler_.get())));
 
@@ -740,7 +740,7 @@
 TEST_F(WebViewSchedulerImplTest, MaxVirtualTimeTaskStarvationCountOneHundred) {
   web_view_scheduler_->EnableVirtualTime();
   web_view_scheduler_->SetMaxVirtualTimeTaskStarvationCount(100);
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kAdvance);
 
   int count = 0;
   int delayed_task_run_at_count = 0;
@@ -755,7 +755,7 @@
       base::TimeDelta::FromMilliseconds(1000),
       WTF::Bind(
           [](WebViewScheduler* scheduler) {
-            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
           },
           WTF::Unretained(web_view_scheduler_.get())));
 
@@ -770,7 +770,7 @@
        MaxVirtualTimeTaskStarvationCountOneHundredNestedMessageLoop) {
   web_view_scheduler_->EnableVirtualTime();
   web_view_scheduler_->SetMaxVirtualTimeTaskStarvationCount(100);
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kAdvance);
   scheduler_->OnBeginNestedRunLoop();
 
   int count = 0;
@@ -786,7 +786,7 @@
       base::TimeDelta::FromMilliseconds(1000),
       WTF::Bind(
           [](WebViewScheduler* scheduler) {
-            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
           },
           WTF::Unretained(web_view_scheduler_.get())));
 
@@ -799,7 +799,7 @@
 TEST_F(WebViewSchedulerImplTest, MaxVirtualTimeTaskStarvationCountZero) {
   web_view_scheduler_->EnableVirtualTime();
   web_view_scheduler_->SetMaxVirtualTimeTaskStarvationCount(0);
-  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::ADVANCE);
+  web_view_scheduler_->SetVirtualTimePolicy(VirtualTimePolicy::kAdvance);
 
   int count = 0;
   int delayed_task_run_at_count = 0;
@@ -814,7 +814,7 @@
       base::TimeDelta::FromMilliseconds(1000),
       WTF::Bind(
           [](WebViewScheduler* scheduler) {
-            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::PAUSE);
+            scheduler->SetVirtualTimePolicy(VirtualTimePolicy::kPause);
           },
           WTF::Unretained(web_view_scheduler_.get())));
 
diff --git a/third_party/WebKit/Source/platform/scheduler/test/fake_web_frame_scheduler.h b/third_party/WebKit/Source/platform/scheduler/test/fake_web_frame_scheduler.h
index 5e91995..066b578 100644
--- a/third_party/WebKit/Source/platform/scheduler/test/fake_web_frame_scheduler.h
+++ b/third_party/WebKit/Source/platform/scheduler/test/fake_web_frame_scheduler.h
@@ -19,7 +19,7 @@
   MainThreadTaskQueueForTest(QueueType queue_type)
       : MainThreadTaskQueue(nullptr,
                             Spec(MainThreadTaskQueue::NameForQueueType(
-                                MainThreadTaskQueue::QueueType::TEST)),
+                                MainThreadTaskQueue::QueueType::kTest)),
                             QueueCreationParams(queue_type),
                             nullptr) {}
   ~MainThreadTaskQueueForTest() {}
diff --git a/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.cc b/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.cc
index 7db1c29..d0a9e84 100644
--- a/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.cc
+++ b/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.cc
@@ -13,7 +13,7 @@
                                      const Callback& callback,
                                      base::TimeDelta reporting_interval)
     : time_(now),
-      thread_state_(ThreadState::PAUSED),
+      thread_state_(ThreadState::kPaused),
       last_state_change_time_(now),
       reporting_interval_(reporting_interval),
       callback_(callback) {
@@ -23,15 +23,15 @@
 ThreadLoadTracker::~ThreadLoadTracker() {}
 
 void ThreadLoadTracker::Pause(base::TimeTicks now) {
-  Advance(now, TaskState::IDLE);
-  thread_state_ = ThreadState::PAUSED;
+  Advance(now, TaskState::kIdle);
+  thread_state_ = ThreadState::kPaused;
 
   Reset(now);
 }
 
 void ThreadLoadTracker::Resume(base::TimeTicks now) {
-  Advance(now, TaskState::IDLE);
-  thread_state_ = ThreadState::ACTIVE;
+  Advance(now, TaskState::kIdle);
+  thread_state_ = ThreadState::kActive;
 
   Reset(now);
 }
@@ -47,12 +47,12 @@
   start_time = std::max(last_state_change_time_, start_time);
   end_time = std::max(last_state_change_time_, end_time);
 
-  Advance(start_time, TaskState::IDLE);
-  Advance(end_time, TaskState::TASK_RUNNING);
+  Advance(start_time, TaskState::kIdle);
+  Advance(end_time, TaskState::kTaskRunning);
 }
 
 void ThreadLoadTracker::RecordIdle(base::TimeTicks now) {
-  Advance(now, TaskState::IDLE);
+  Advance(now, TaskState::kIdle);
 }
 
 namespace {
@@ -80,7 +80,7 @@
   // when appropriate.
   DCHECK_LE(time_, now);
 
-  if (thread_state_ == ThreadState::PAUSED) {
+  if (thread_state_ == ThreadState::kPaused) {
     // If the load tracker is paused, bail out early.
     time_ = now;
     return;
@@ -96,7 +96,7 @@
 
     // Keep a running total of the time spent running tasks within the window
     // and the total time.
-    if (task_state == TaskState::TASK_RUNNING) {
+    if (task_state == TaskState::kTaskRunning) {
       run_time_inside_window_ +=
           Intersection(next_reporting_time_ - reporting_interval_,
                        next_reporting_time_, time_, time_ + delta);
@@ -106,9 +106,9 @@
 
     if (time_ == next_reporting_time_) {
       // Call |callback_| if need and update next callback time.
-      if (thread_state_ == ThreadState::ACTIVE) {
+      if (thread_state_ == ThreadState::kActive) {
         callback_.Run(time_, Load());
-        DCHECK_EQ(thread_state_, ThreadState::ACTIVE);
+        DCHECK_EQ(thread_state_, ThreadState::kActive);
       }
       next_reporting_time_ += reporting_interval_;
       run_time_inside_window_ = base::TimeDelta();
diff --git a/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.h b/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.h
index b7606a7d..d4db58c 100644
--- a/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.h
+++ b/third_party/WebKit/Source/platform/scheduler/util/thread_load_tracker.h
@@ -41,9 +41,9 @@
   // TODO(altimin): Count wake-ups.
 
  private:
-  enum class ThreadState { ACTIVE, PAUSED };
+  enum class ThreadState { kActive, kPaused };
 
-  enum class TaskState { TASK_RUNNING, IDLE };
+  enum class TaskState { kTaskRunning, kIdle };
 
   // This function advances |time_| to |now|, calling |callback_|
   // in the process (multiple times if needed).