content/renderer/gpu/render_widget_compositor_unittest.cc - codesearch/chromium/src - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "content/renderer/gpu/render_widget_compositor.h"

 #include <utility>

 #include "base/location.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "cc/animation/animation_host.h"
 #include "cc/test/fake_layer_tree_frame_sink.h"
 #include "cc/test/test_context_provider.h"
 #include "cc/test/test_web_graphics_context_3d.h"
 #include "cc/trees/layer_tree_host.h"
 #include "components/viz/common/frame_sinks/copy_output_request.h"
 #include "content/public/common/screen_info.h"
 #include "content/public/test/mock_render_thread.h"
 #include "content/renderer/render_widget.h"
 #include "content/test/fake_compositor_dependencies.h"
 #include "gpu/GLES2/gl2extchromium.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"

 using testing::AllOf;
 using testing::Field;

 namespace content {
 namespace {

 enum FailureMode {
   NO_FAILURE,
   BIND_CONTEXT_FAILURE,
   GPU_CHANNEL_FAILURE,
 };

 class StubRenderWidgetCompositorDelegate
     : public RenderWidgetCompositorDelegate {
  public:
   // RenderWidgetCompositorDelegate implementation.
   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
                            const gfx::Vector2dF& outer_delta,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float page_scale,
                            float top_controls_delta) override {}
   void RecordWheelAndTouchScrollingCount(bool has_scrolled_by_wheel,
                                          bool has_scrolled_by_touch) override {}
   void BeginMainFrame(double frame_time_sec) override {}
   void RequestNewLayerTreeFrameSink(
       const LayerTreeFrameSinkCallback& callback) override {
     callback.Run(nullptr);
   }
   void DidCommitAndDrawCompositorFrame() override {}
   void DidCommitCompositorFrame() override {}
   void DidCompletePageScaleAnimation() override {}
   void DidReceiveCompositorFrameAck() override {}
   bool IsClosing() const override { return false; }
   void RequestScheduleAnimation() override {}
   void UpdateVisualState() override {}
   void WillBeginCompositorFrame() override {}
   std::unique_ptr<cc::SwapPromise> RequestCopyOfOutputForLayoutTest(
       std::unique_ptr<viz::CopyOutputRequest> request) override {
     return nullptr;
   }
 };

 class FakeRenderWidgetCompositorDelegate
     : public StubRenderWidgetCompositorDelegate {
  public:
   FakeRenderWidgetCompositorDelegate() = default;

   void RequestNewLayerTreeFrameSink(
       const LayerTreeFrameSinkCallback& callback) override {
     // Subtract one cuz the current request has already been counted but should
     // not be included for this.
     if (num_requests_since_last_success_ - 1 < num_requests_before_success_) {
       callback.Run(std::unique_ptr<cc::LayerTreeFrameSink>());
       return;
     }

     auto context_provider = cc::TestContextProvider::Create();
     if (num_failures_since_last_success_ < num_failures_before_success_) {
       context_provider->UnboundTestContext3d()->loseContextCHROMIUM(
           GL_GUILTY_CONTEXT_RESET_ARB, GL_INNOCENT_CONTEXT_RESET_ARB);
     }
     callback.Run(
         cc::FakeLayerTreeFrameSink::Create3d(std::move(context_provider)));
   }

   void Reset() {
     num_requests_ = 0;
     num_requests_before_success_ = 0;
     num_requests_since_last_success_ = 0;
     num_failures_ = 0;
     num_failures_before_success_ = 0;
     num_failures_since_last_success_ = 0;
     num_successes_ = 0;
   }

   void add_success() {
     ++num_successes_;
     num_requests_since_last_success_ = 0;
     num_failures_since_last_success_ = 0;
   }
   int num_successes() const { return num_successes_; }

   void add_request() {
     ++num_requests_since_last_success_;
     ++num_requests_;
   }
   int num_requests() const { return num_requests_; }

   void add_failure() {
     ++num_failures_since_last_success_;
     ++num_failures_;
   }
   int num_failures() const { return num_failures_; }

   void set_num_requests_before_success(int n) {
     num_requests_before_success_ = n;
   }
   void set_num_failures_before_success(int n) {
     num_failures_before_success_ = n;
   }
   int num_failures_before_success() const {
     return num_failures_before_success_;
   }

  private:
   int num_requests_ = 0;
   int num_requests_before_success_ = 0;
   int num_requests_since_last_success_ = 0;
   int num_failures_ = 0;
   int num_failures_before_success_ = 0;
   int num_failures_since_last_success_ = 0;
   int num_successes_ = 0;

   DISALLOW_COPY_AND_ASSIGN(FakeRenderWidgetCompositorDelegate);
 };

 // Verify that failing to create an output surface will cause the compositor
 // to attempt to repeatedly create another output surface.
 // The use null output surface parameter allows testing whether failures
 // from RenderWidget (couldn't create an output surface) vs failures from
 // the compositor (couldn't bind the output surface) are handled identically.
 class RenderWidgetLayerTreeFrameSink : public RenderWidgetCompositor {
  public:
   RenderWidgetLayerTreeFrameSink(FakeRenderWidgetCompositorDelegate* delegate,
                                  CompositorDependencies* compositor_deps)
       : RenderWidgetCompositor(delegate, compositor_deps),
         delegate_(delegate) {}

   using RenderWidgetCompositor::Initialize;

   // Force a new output surface to be created.
   void SynchronousComposite() {
     layer_tree_host()->SetVisible(false);
     layer_tree_host()->ReleaseLayerTreeFrameSink();
     layer_tree_host()->SetVisible(true);

     base::TimeTicks some_time;
     layer_tree_host()->Composite(some_time);
   }

   void RequestNewLayerTreeFrameSink() override {
     delegate_->add_request();
     RenderWidgetCompositor::RequestNewLayerTreeFrameSink();
   }

   void DidInitializeLayerTreeFrameSink() override {
     RenderWidgetCompositor::DidInitializeLayerTreeFrameSink();
     delegate_->add_success();
     if (delegate_->num_successes() == expected_successes_) {
       EXPECT_EQ(delegate_->num_requests(), expected_requests_);
       EndTest();
     } else {
       // Post the synchronous composite task so that it is not called
       // reentrantly as a part of RequestNewLayerTreeFrameSink.
       base::ThreadTaskRunnerHandle::Get()->PostTask(
           FROM_HERE,
           base::BindOnce(&RenderWidgetLayerTreeFrameSink::SynchronousComposite,
                          base::Unretained(this)));
     }
   }

   void DidFailToInitializeLayerTreeFrameSink() override {
     RenderWidgetCompositor::DidFailToInitializeLayerTreeFrameSink();
     delegate_->add_failure();
     if (delegate_->num_requests() == expected_requests_) {
       EXPECT_EQ(delegate_->num_successes(), expected_successes_);
       EndTest();
       return;
     }
   }

   void SetUp(int expected_successes,
              int num_tries,
              FailureMode failure_mode,
              base::RunLoop* run_loop) {
     run_loop_ = run_loop;
     failure_mode_ = failure_mode;
     expected_successes_ = expected_successes;
     switch (failure_mode_) {
       case NO_FAILURE:
         expected_requests_ = expected_successes;
         break;
       case BIND_CONTEXT_FAILURE:
       case GPU_CHANNEL_FAILURE:
         expected_requests_ = num_tries * std::max(1, expected_successes);
         break;
     }
   }

   void EndTest() { run_loop_->Quit(); }

  private:
   FakeRenderWidgetCompositorDelegate* delegate_;
   base::RunLoop* run_loop_ = nullptr;
   int expected_successes_ = 0;
   int expected_requests_ = 0;
   FailureMode failure_mode_ = NO_FAILURE;

   DISALLOW_COPY_AND_ASSIGN(RenderWidgetLayerTreeFrameSink);
 };

 class RenderWidgetLayerTreeFrameSinkTest : public testing::Test {
  public:
   RenderWidgetLayerTreeFrameSinkTest()
       : render_widget_compositor_(&compositor_delegate_, &compositor_deps_) {
     auto animation_host = cc::AnimationHost::CreateMainInstance();

     ScreenInfo dummy_screen_info;
     const float initial_device_scale_factor = 1.f;

     auto layer_tree_host = RenderWidgetCompositor::CreateLayerTreeHost(
         &render_widget_compositor_, &render_widget_compositor_,
         animation_host.get(), &compositor_deps_, initial_device_scale_factor,
         dummy_screen_info);
     render_widget_compositor_.Initialize(std::move(layer_tree_host),
                                          std::move(animation_host));
   }

   void RunTest(int expected_successes, FailureMode failure_mode) {
     compositor_delegate_.Reset();
     // 6 is just an artibrary "large" number to show it keeps trying.
     const int kTries = 6;
     // If it should fail, then it will fail every attempt, otherwise it fails
     // until the last attempt.
     int tries_before_success = kTries - (expected_successes ? 1 : 0);
     switch (failure_mode) {
       case NO_FAILURE:
         compositor_delegate_.set_num_failures_before_success(0);
         compositor_delegate_.set_num_requests_before_success(0);
         break;
       case BIND_CONTEXT_FAILURE:
         compositor_delegate_.set_num_failures_before_success(
             tries_before_success);
         compositor_delegate_.set_num_requests_before_success(0);
         break;
       case GPU_CHANNEL_FAILURE:
         compositor_delegate_.set_num_failures_before_success(0);
         compositor_delegate_.set_num_requests_before_success(
             tries_before_success);
         break;
     }
     base::RunLoop run_loop;
     render_widget_compositor_.SetUp(expected_successes, kTries, failure_mode,
                                     &run_loop);
     render_widget_compositor_.SetVisible(true);
     base::ThreadTaskRunnerHandle::Get()->PostTask(
         FROM_HERE,
         base::BindOnce(&RenderWidgetLayerTreeFrameSink::SynchronousComposite,
                        base::Unretained(&render_widget_compositor_)));
     run_loop.Run();
   }

  protected:
   base::MessageLoop ye_olde_message_loope_;
   MockRenderThread render_thread_;
   FakeCompositorDependencies compositor_deps_;
   FakeRenderWidgetCompositorDelegate compositor_delegate_;
   RenderWidgetLayerTreeFrameSink render_widget_compositor_;

  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetLayerTreeFrameSinkTest);
 };

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedOnce) {
   RunTest(1, NO_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedOnce_AfterNullChannel) {
   RunTest(1, GPU_CHANNEL_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedOnce_AfterLostContext) {
   RunTest(1, BIND_CONTEXT_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedTwice) {
   RunTest(2, NO_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedTwice_AfterNullChannel) {
   RunTest(2, GPU_CHANNEL_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedTwice_AfterLostContext) {
   RunTest(2, BIND_CONTEXT_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, FailWithNullChannel) {
   RunTest(0, GPU_CHANNEL_FAILURE);
 }

 TEST_F(RenderWidgetLayerTreeFrameSinkTest, FailWithLostContext) {
   RunTest(0, BIND_CONTEXT_FAILURE);
 }

 class VisibilityTestRenderWidgetCompositor : public RenderWidgetCompositor {
  public:
   VisibilityTestRenderWidgetCompositor(
       StubRenderWidgetCompositorDelegate* delegate,
       CompositorDependencies* compositor_deps)
       : RenderWidgetCompositor(delegate, compositor_deps) {}

   void RequestNewLayerTreeFrameSink() override {
     RenderWidgetCompositor::RequestNewLayerTreeFrameSink();
     num_requests_sent_++;
     if (run_loop_)
       run_loop_->Quit();
   }

   void set_run_loop(base::RunLoop* run_loop) { run_loop_ = run_loop; }
   int num_requests_sent() { return num_requests_sent_; }

  private:
   int num_requests_sent_ = 0;
   base::RunLoop* run_loop_;
 };

 TEST(RenderWidgetCompositorTest, VisibilityTest) {
   // Test that RenderWidgetCompositor does not retry FrameSink request while
   // invisible.

   base::MessageLoop message_loop;

   FakeCompositorDependencies compositor_deps;
   // Synchronously callback with null FrameSink.
   StubRenderWidgetCompositorDelegate compositor_delegate;
   VisibilityTestRenderWidgetCompositor render_widget_compositor(
       &compositor_delegate, &compositor_deps);

   auto animation_host = cc::AnimationHost::CreateMainInstance();
   ScreenInfo dummy_screen_info;
   const float initial_device_scale_factor = 1.f;
   auto layer_tree_host = RenderWidgetCompositor::CreateLayerTreeHost(
       &render_widget_compositor, &render_widget_compositor,
       animation_host.get(), &compositor_deps, initial_device_scale_factor,
       dummy_screen_info);
   render_widget_compositor.Initialize(std::move(layer_tree_host),
                                       std::move(animation_host));

   {
     // Make one request and stop immediately while invisible.
     base::RunLoop run_loop;
     render_widget_compositor.set_run_loop(&run_loop);
     render_widget_compositor.SetVisible(false);
     render_widget_compositor.RequestNewLayerTreeFrameSink();
     run_loop.Run();
     render_widget_compositor.set_run_loop(nullptr);
     EXPECT_EQ(1, render_widget_compositor.num_requests_sent());
   }

   {
     // Make sure there are no more requests.
     base::RunLoop run_loop;
     run_loop.RunUntilIdle();
     EXPECT_EQ(1, render_widget_compositor.num_requests_sent());
   }

   {
     // Becoming visible retries request.
     base::RunLoop run_loop;
     render_widget_compositor.set_run_loop(&run_loop);
     render_widget_compositor.SetVisible(true);
     run_loop.Run();
     render_widget_compositor.set_run_loop(nullptr);
     EXPECT_EQ(2, render_widget_compositor.num_requests_sent());
   }
 }

 // Verify desktop memory limit calculations.
 #if !defined(OS_ANDROID)
 TEST(RenderWidgetCompositorTest, IgnoreGivenMemoryPolicy) {
   auto policy = RenderWidgetCompositor::GetGpuMemoryPolicy(
       cc::ManagedMemoryPolicy(256), ScreenInfo());
   EXPECT_EQ(512u * 1024u * 1024u, policy.bytes_limit_when_visible);
   EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
             policy.priority_cutoff_when_visible);
 }

 TEST(RenderWidgetCompositorTest, LargeScreensUseMoreMemory) {
   ScreenInfo screen_info;

   screen_info.rect = gfx::Rect(4096, 2160);
   screen_info.device_scale_factor = 1.f;
   auto policy = RenderWidgetCompositor::GetGpuMemoryPolicy(
       cc::ManagedMemoryPolicy(256), screen_info);
   EXPECT_EQ(2u * 512u * 1024u * 1024u, policy.bytes_limit_when_visible);
   EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
             policy.priority_cutoff_when_visible);

   screen_info.rect = gfx::Rect(2048, 1080);
   screen_info.device_scale_factor = 2.f;
   policy = RenderWidgetCompositor::GetGpuMemoryPolicy(
       cc::ManagedMemoryPolicy(256), screen_info);
   EXPECT_EQ(2u * 512u * 1024u * 1024u, policy.bytes_limit_when_visible);
   EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
             policy.priority_cutoff_when_visible);
 }
 #endif  // !defined(OS_ANDROID)

 }  // namespace
 }  // namespace content
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "content/renderer/gpu/render_widget_compositor.h"

	#include <utility>

	#include "base/location.h"
	#include "base/macros.h"
	#include "base/memory/ptr_util.h"
	#include "base/message_loop/message_loop.h"
	#include "base/run_loop.h"
	#include "base/single_thread_task_runner.h"
	#include "base/threading/thread_task_runner_handle.h"
	#include "build/build_config.h"
	#include "cc/animation/animation_host.h"
	#include "cc/test/fake_layer_tree_frame_sink.h"
	#include "cc/test/test_context_provider.h"
	#include "cc/test/test_web_graphics_context_3d.h"
	#include "cc/trees/layer_tree_host.h"
	#include "components/viz/common/frame_sinks/copy_output_request.h"
	#include "content/public/common/screen_info.h"
	#include "content/public/test/mock_render_thread.h"
	#include "content/renderer/render_widget.h"
	#include "content/test/fake_compositor_dependencies.h"
	#include "gpu/GLES2/gl2extchromium.h"
	#include "testing/gmock/include/gmock/gmock.h"
	#include "testing/gtest/include/gtest/gtest.h"

	using testing::AllOf;
	using testing::Field;

	namespace content {
	namespace {

	enum FailureMode {
	NO_FAILURE,
	BIND_CONTEXT_FAILURE,
	GPU_CHANNEL_FAILURE,
	};

	class StubRenderWidgetCompositorDelegate
	: public RenderWidgetCompositorDelegate {
	public:
	// RenderWidgetCompositorDelegate implementation.
	void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
	const gfx::Vector2dF& outer_delta,
	const gfx::Vector2dF& elastic_overscroll_delta,
	float page_scale,
	float top_controls_delta) override {}
	void RecordWheelAndTouchScrollingCount(bool has_scrolled_by_wheel,
	bool has_scrolled_by_touch) override {}
	void BeginMainFrame(double frame_time_sec) override {}
	void RequestNewLayerTreeFrameSink(
	const LayerTreeFrameSinkCallback& callback) override {
	callback.Run(nullptr);
	}
	void DidCommitAndDrawCompositorFrame() override {}
	void DidCommitCompositorFrame() override {}
	void DidCompletePageScaleAnimation() override {}
	void DidReceiveCompositorFrameAck() override {}
	bool IsClosing() const override { return false; }
	void RequestScheduleAnimation() override {}
	void UpdateVisualState() override {}
	void WillBeginCompositorFrame() override {}
	std::unique_ptr<cc::SwapPromise> RequestCopyOfOutputForLayoutTest(
	std::unique_ptr<viz::CopyOutputRequest> request) override {
	return nullptr;
	}
	};

	class FakeRenderWidgetCompositorDelegate
	: public StubRenderWidgetCompositorDelegate {
	public:
	FakeRenderWidgetCompositorDelegate() = default;

	void RequestNewLayerTreeFrameSink(
	const LayerTreeFrameSinkCallback& callback) override {
	// Subtract one cuz the current request has already been counted but should
	// not be included for this.
	if (num_requests_since_last_success_ - 1 < num_requests_before_success_) {
	callback.Run(std::unique_ptr<cc::LayerTreeFrameSink>());
	return;
	}

	auto context_provider = cc::TestContextProvider::Create();
	if (num_failures_since_last_success_ < num_failures_before_success_) {
	context_provider->UnboundTestContext3d()->loseContextCHROMIUM(
	GL_GUILTY_CONTEXT_RESET_ARB, GL_INNOCENT_CONTEXT_RESET_ARB);
	}
	callback.Run(
	cc::FakeLayerTreeFrameSink::Create3d(std::move(context_provider)));
	}

	void Reset() {
	num_requests_ = 0;
	num_requests_before_success_ = 0;
	num_requests_since_last_success_ = 0;
	num_failures_ = 0;
	num_failures_before_success_ = 0;
	num_failures_since_last_success_ = 0;
	num_successes_ = 0;
	}

	void add_success() {
	++num_successes_;
	num_requests_since_last_success_ = 0;
	num_failures_since_last_success_ = 0;
	}
	int num_successes() const { return num_successes_; }

	void add_request() {
	++num_requests_since_last_success_;
	++num_requests_;
	}
	int num_requests() const { return num_requests_; }

	void add_failure() {
	++num_failures_since_last_success_;
	++num_failures_;
	}
	int num_failures() const { return num_failures_; }

	void set_num_requests_before_success(int n) {
	num_requests_before_success_ = n;
	}
	void set_num_failures_before_success(int n) {
	num_failures_before_success_ = n;
	}
	int num_failures_before_success() const {
	return num_failures_before_success_;
	}

	private:
	int num_requests_ = 0;
	int num_requests_before_success_ = 0;
	int num_requests_since_last_success_ = 0;
	int num_failures_ = 0;
	int num_failures_before_success_ = 0;
	int num_failures_since_last_success_ = 0;
	int num_successes_ = 0;

	DISALLOW_COPY_AND_ASSIGN(FakeRenderWidgetCompositorDelegate);
	};

	// Verify that failing to create an output surface will cause the compositor
	// to attempt to repeatedly create another output surface.
	// The use null output surface parameter allows testing whether failures
	// from RenderWidget (couldn't create an output surface) vs failures from
	// the compositor (couldn't bind the output surface) are handled identically.
	class RenderWidgetLayerTreeFrameSink : public RenderWidgetCompositor {
	public:
	RenderWidgetLayerTreeFrameSink(FakeRenderWidgetCompositorDelegate* delegate,
	CompositorDependencies* compositor_deps)
	: RenderWidgetCompositor(delegate, compositor_deps),
	delegate_(delegate) {}

	using RenderWidgetCompositor::Initialize;

	// Force a new output surface to be created.
	void SynchronousComposite() {
	layer_tree_host()->SetVisible(false);
	layer_tree_host()->ReleaseLayerTreeFrameSink();
	layer_tree_host()->SetVisible(true);

	base::TimeTicks some_time;
	layer_tree_host()->Composite(some_time);
	}

	void RequestNewLayerTreeFrameSink() override {
	delegate_->add_request();
	RenderWidgetCompositor::RequestNewLayerTreeFrameSink();
	}

	void DidInitializeLayerTreeFrameSink() override {
	RenderWidgetCompositor::DidInitializeLayerTreeFrameSink();
	delegate_->add_success();
	if (delegate_->num_successes() == expected_successes_) {
	EXPECT_EQ(delegate_->num_requests(), expected_requests_);
	EndTest();
	} else {
	// Post the synchronous composite task so that it is not called
	// reentrantly as a part of RequestNewLayerTreeFrameSink.
	base::ThreadTaskRunnerHandle::Get()->PostTask(
	FROM_HERE,
	base::BindOnce(&RenderWidgetLayerTreeFrameSink::SynchronousComposite,
	base::Unretained(this)));
	}
	}

	void DidFailToInitializeLayerTreeFrameSink() override {
	RenderWidgetCompositor::DidFailToInitializeLayerTreeFrameSink();
	delegate_->add_failure();
	if (delegate_->num_requests() == expected_requests_) {
	EXPECT_EQ(delegate_->num_successes(), expected_successes_);
	EndTest();
	return;
	}
	}

	void SetUp(int expected_successes,
	int num_tries,
	FailureMode failure_mode,
	base::RunLoop* run_loop) {
	run_loop_ = run_loop;
	failure_mode_ = failure_mode;
	expected_successes_ = expected_successes;
	switch (failure_mode_) {
	case NO_FAILURE:
	expected_requests_ = expected_successes;
	break;
	case BIND_CONTEXT_FAILURE:
	case GPU_CHANNEL_FAILURE:
	expected_requests_ = num_tries * std::max(1, expected_successes);
	break;
	}
	}

	void EndTest() { run_loop_->Quit(); }

	private:
	FakeRenderWidgetCompositorDelegate* delegate_;
	base::RunLoop* run_loop_ = nullptr;
	int expected_successes_ = 0;
	int expected_requests_ = 0;
	FailureMode failure_mode_ = NO_FAILURE;

	DISALLOW_COPY_AND_ASSIGN(RenderWidgetLayerTreeFrameSink);
	};

	class RenderWidgetLayerTreeFrameSinkTest : public testing::Test {
	public:
	RenderWidgetLayerTreeFrameSinkTest()
	: render_widget_compositor_(&compositor_delegate_, &compositor_deps_) {
	auto animation_host = cc::AnimationHost::CreateMainInstance();

	ScreenInfo dummy_screen_info;
	const float initial_device_scale_factor = 1.f;

	auto layer_tree_host = RenderWidgetCompositor::CreateLayerTreeHost(
	&render_widget_compositor_, &render_widget_compositor_,
	animation_host.get(), &compositor_deps_, initial_device_scale_factor,
	dummy_screen_info);
	render_widget_compositor_.Initialize(std::move(layer_tree_host),
	std::move(animation_host));
	}

	void RunTest(int expected_successes, FailureMode failure_mode) {
	compositor_delegate_.Reset();
	// 6 is just an artibrary "large" number to show it keeps trying.
	const int kTries = 6;
	// If it should fail, then it will fail every attempt, otherwise it fails
	// until the last attempt.
	int tries_before_success = kTries - (expected_successes ? 1 : 0);
	switch (failure_mode) {
	case NO_FAILURE:
	compositor_delegate_.set_num_failures_before_success(0);
	compositor_delegate_.set_num_requests_before_success(0);
	break;
	case BIND_CONTEXT_FAILURE:
	compositor_delegate_.set_num_failures_before_success(
	tries_before_success);
	compositor_delegate_.set_num_requests_before_success(0);
	break;
	case GPU_CHANNEL_FAILURE:
	compositor_delegate_.set_num_failures_before_success(0);
	compositor_delegate_.set_num_requests_before_success(
	tries_before_success);
	break;
	}
	base::RunLoop run_loop;
	render_widget_compositor_.SetUp(expected_successes, kTries, failure_mode,
	&run_loop);
	render_widget_compositor_.SetVisible(true);
	base::ThreadTaskRunnerHandle::Get()->PostTask(
	FROM_HERE,
	base::BindOnce(&RenderWidgetLayerTreeFrameSink::SynchronousComposite,
	base::Unretained(&render_widget_compositor_)));
	run_loop.Run();
	}

	protected:
	base::MessageLoop ye_olde_message_loope_;
	MockRenderThread render_thread_;
	FakeCompositorDependencies compositor_deps_;
	FakeRenderWidgetCompositorDelegate compositor_delegate_;
	RenderWidgetLayerTreeFrameSink render_widget_compositor_;

	private:
	DISALLOW_COPY_AND_ASSIGN(RenderWidgetLayerTreeFrameSinkTest);
	};

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedOnce) {
	RunTest(1, NO_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedOnce_AfterNullChannel) {
	RunTest(1, GPU_CHANNEL_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedOnce_AfterLostContext) {
	RunTest(1, BIND_CONTEXT_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedTwice) {
	RunTest(2, NO_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedTwice_AfterNullChannel) {
	RunTest(2, GPU_CHANNEL_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, SucceedTwice_AfterLostContext) {
	RunTest(2, BIND_CONTEXT_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, FailWithNullChannel) {
	RunTest(0, GPU_CHANNEL_FAILURE);
	}

	TEST_F(RenderWidgetLayerTreeFrameSinkTest, FailWithLostContext) {
	RunTest(0, BIND_CONTEXT_FAILURE);
	}

	class VisibilityTestRenderWidgetCompositor : public RenderWidgetCompositor {
	public:
	VisibilityTestRenderWidgetCompositor(
	StubRenderWidgetCompositorDelegate* delegate,
	CompositorDependencies* compositor_deps)
	: RenderWidgetCompositor(delegate, compositor_deps) {}

	void RequestNewLayerTreeFrameSink() override {
	RenderWidgetCompositor::RequestNewLayerTreeFrameSink();
	num_requests_sent_++;
	if (run_loop_)
	run_loop_->Quit();
	}

	void set_run_loop(base::RunLoop* run_loop) { run_loop_ = run_loop; }
	int num_requests_sent() { return num_requests_sent_; }

	private:
	int num_requests_sent_ = 0;
	base::RunLoop* run_loop_;
	};

	TEST(RenderWidgetCompositorTest, VisibilityTest) {
	// Test that RenderWidgetCompositor does not retry FrameSink request while
	// invisible.

	base::MessageLoop message_loop;

	FakeCompositorDependencies compositor_deps;
	// Synchronously callback with null FrameSink.
	StubRenderWidgetCompositorDelegate compositor_delegate;
	VisibilityTestRenderWidgetCompositor render_widget_compositor(
	&compositor_delegate, &compositor_deps);

	auto animation_host = cc::AnimationHost::CreateMainInstance();
	ScreenInfo dummy_screen_info;
	const float initial_device_scale_factor = 1.f;
	auto layer_tree_host = RenderWidgetCompositor::CreateLayerTreeHost(
	&render_widget_compositor, &render_widget_compositor,
	animation_host.get(), &compositor_deps, initial_device_scale_factor,
	dummy_screen_info);
	render_widget_compositor.Initialize(std::move(layer_tree_host),
	std::move(animation_host));

	{
	// Make one request and stop immediately while invisible.
	base::RunLoop run_loop;
	render_widget_compositor.set_run_loop(&run_loop);
	render_widget_compositor.SetVisible(false);
	render_widget_compositor.RequestNewLayerTreeFrameSink();
	run_loop.Run();
	render_widget_compositor.set_run_loop(nullptr);
	EXPECT_EQ(1, render_widget_compositor.num_requests_sent());
	}

	{
	// Make sure there are no more requests.
	base::RunLoop run_loop;
	run_loop.RunUntilIdle();
	EXPECT_EQ(1, render_widget_compositor.num_requests_sent());
	}

	{
	// Becoming visible retries request.
	base::RunLoop run_loop;
	render_widget_compositor.set_run_loop(&run_loop);
	render_widget_compositor.SetVisible(true);
	run_loop.Run();
	render_widget_compositor.set_run_loop(nullptr);
	EXPECT_EQ(2, render_widget_compositor.num_requests_sent());
	}
	}

	// Verify desktop memory limit calculations.
	#if !defined(OS_ANDROID)
	TEST(RenderWidgetCompositorTest, IgnoreGivenMemoryPolicy) {
	auto policy = RenderWidgetCompositor::GetGpuMemoryPolicy(
	cc::ManagedMemoryPolicy(256), ScreenInfo());
	EXPECT_EQ(512u * 1024u * 1024u, policy.bytes_limit_when_visible);
	EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
	policy.priority_cutoff_when_visible);
	}

	TEST(RenderWidgetCompositorTest, LargeScreensUseMoreMemory) {
	ScreenInfo screen_info;

	screen_info.rect = gfx::Rect(4096, 2160);
	screen_info.device_scale_factor = 1.f;
	auto policy = RenderWidgetCompositor::GetGpuMemoryPolicy(
	cc::ManagedMemoryPolicy(256), screen_info);
	EXPECT_EQ(2u * 512u * 1024u * 1024u, policy.bytes_limit_when_visible);
	EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
	policy.priority_cutoff_when_visible);

	screen_info.rect = gfx::Rect(2048, 1080);
	screen_info.device_scale_factor = 2.f;
	policy = RenderWidgetCompositor::GetGpuMemoryPolicy(
	cc::ManagedMemoryPolicy(256), screen_info);
	EXPECT_EQ(2u * 512u * 1024u * 1024u, policy.bytes_limit_when_visible);
	EXPECT_EQ(gpu::MemoryAllocation::CUTOFF_ALLOW_NICE_TO_HAVE,
	policy.priority_cutoff_when_visible);
	}
	#endif // !defined(OS_ANDROID)

	} // namespace
	} // namespace content