| // Copyright 2018 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 "third_party/blink/public/common/features.h" |
| |
| #include "base/feature_list.h" |
| #include "build/build_config.h" |
| #include "services/network/public/cpp/features.h" |
| #include "third_party/blink/public/common/forcedark/forcedark_switches.h" |
| |
| namespace blink { |
| namespace features { |
| |
| // Enable intervention for download that was initiated from or occurred in an ad |
| // frame without user activation. |
| const base::Feature kBlockingDownloadsInAdFrameWithoutUserActivation{ |
| "BlockingDownloadsInAdFrameWithoutUserActivation", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enable defer commits a bit to avoid flash. |
| const base::Feature kAvoidFlashBetweenNavigation{ |
| "AvoidFlashBetweenNavigation", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable eagerly setting up a CacheStorage interface pointer and |
| // passing it to service workers on startup as an optimization. |
| const base::Feature kEagerCacheStorageSetupForServiceWorkers{ |
| "EagerCacheStorageSetupForServiceWorkers", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Controls the user-specified viewport restriction for GPU Rasterization on |
| // mobile. See https://crbug.com/899399 |
| const base::Feature kEnableGpuRasterizationViewportRestriction{ |
| "EnableGpuRasterizationViewportRestriction", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Controls script streaming. |
| const base::Feature kScriptStreaming{"ScriptStreaming", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Allow streaming small (<30kB) scripts. |
| const base::Feature kSmallScriptStreaming{"SmallScriptStreaming", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enables user level memory pressure signal generation on Android. |
| const base::Feature kUserLevelMemoryPressureSignal{ |
| "UserLevelMemoryPressureSignal", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable FCP++ by experiment. See https://crbug.com/869924 |
| const base::Feature kFirstContentfulPaintPlusPlus{ |
| "FirstContentfulPaintPlusPlus", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Perform memory purges after freezing only if all pages are frozen. |
| const base::Feature kFreezePurgeMemoryAllPagesFrozen{ |
| "FreezePurgeMemoryAllPagesFrozen", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Freezes the user-agent as part of https://github.com/WICG/ua-client-hints. |
| const base::Feature kFreezeUserAgent{"FreezeUserAgent", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enables the experimental sweep-line algorithm for tracking "jank" from |
| // layout objects changing their visual location between animation frames. |
| const base::Feature kJankTrackingSweepLine{"JankTrackingSweepLine", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable a new CSS property called backdrop-filter. |
| const base::Feature kCSSBackdropFilter{"CSSBackdropFilter", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enable Display Locking JavaScript APIs. |
| const base::Feature kDisplayLocking{"DisplayLocking", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable applying rounded corner masks via a GL shader rather than |
| // a mask layer. |
| const base::Feature kFastBorderRadius{"FastBorderRadius", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable LayoutNG. |
| const base::Feature kLayoutNG{"LayoutNG", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| const base::Feature kMixedContentAutoupgrade{"AutoupgradeMixedContent", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Used to control the collection of anchor element metrics (crbug.com/856683). |
| // If kNavigationPredictor is enabled, then metrics of anchor elements |
| // in the first viewport after the page load and the metrics of the clicked |
| // anchor element will be extracted and recorded. Additionally, navigation |
| // predictor may preconnect/prefetch to resources/origins to make the |
| // future navigations faster. |
| const base::Feature kNavigationPredictor { |
| "NavigationPredictor", |
| #if defined(OS_ANDROID) |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #else |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| // Enable off-the-main-thread dedicated worker script fetch. |
| // (https://crbug.com/835717) |
| const base::Feature kOffMainThreadDedicatedWorkerScriptFetch{ |
| "OffMainThreadDedicatedWorkerScriptFetch", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable browser-initiated dedicated worker script loading |
| // (PlzDedicatedWorker). https://crbug.com/906991 |
| const base::Feature kPlzDedicatedWorker{"PlzDedicatedWorker", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable Portals. https://crbug.com/865123. |
| const base::Feature kPortals{"Portals", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable limiting previews loading hints to specific resource types. |
| const base::Feature kPreviewsResourceLoadingHintsSpecificResourceTypes{ |
| "PreviewsResourceLoadingHintsSpecificResourceTypes", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Perform a memory purge after a renderer is backgrounded. Formerly labelled as |
| // the "PurgeAndSuspend" experiment. |
| // |
| // TODO(adityakeerthi): Disabled by default on Mac and Android for historical |
| // reasons. Consider enabling by default if experiment results are positive. |
| // https://crbug.com/926186 |
| const base::Feature kPurgeRendererMemoryWhenBackgrounded { |
| "PurgeRendererMemoryWhenBackgrounded", |
| #if defined(OS_MACOSX) || defined(OS_ANDROID) |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #else |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| // Enable Implicit Root Scroller. https://crbug.com/903260. |
| // TODO(bokan): Temporarily disabled on desktop platforms to address issues |
| // with non-overlay scrollbars. https://crbug.com/948059. |
| const base::Feature kImplicitRootScroller { |
| "ImplicitRootScroller", |
| #if defined(OS_ANDROID) |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #else |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| // Enables usage of getDisplayMedia() that allows capture of web content, see |
| // https://crbug.com/865060. |
| const base::Feature kRTCGetDisplayMedia{"RTCGetDisplayMedia", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Changes the default RTCPeerConnection constructor behavior to use Unified |
| // Plan as the SDP semantics. When the feature is enabled, Unified Plan is used |
| // unless the default is overridden (by passing {sdpSemantics:'plan-b'} as the |
| // argument). |
| const base::Feature kRTCUnifiedPlanByDefault{"RTCUnifiedPlanByDefault", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Determines if the SDP attrbute extmap-allow-mixed should be offered by |
| // default or not. The default value can be overridden by passing |
| // {offerExtmapAllowMixed:true} as an argument to the RTCPeerConnection |
| // constructor. |
| const base::Feature kRTCOfferExtmapAllowMixed{ |
| "RTCOfferExtmapAllowMixed", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| const base::Feature kServiceWorkerIsolateInForeground{ |
| "ServiceWorkerIsolateInForeground", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| const base::Feature kServiceWorkerImportedScriptUpdateCheck{ |
| "ServiceWorkerImportedScriptUpdateCheck", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| const base::Feature kServiceWorkerAggressiveCodeCache{ |
| "ServiceWorkerAggressiveCodeCache", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Experiment of the delay from navigation to starting an update of a service |
| // worker's script. |
| const base::Feature kServiceWorkerUpdateDelay{ |
| "ServiceWorkerUpdateDelay", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Freeze scheduler task queues in background after allowed grace time. |
| // "stop" is a legacy name. |
| const base::Feature kStopInBackground { |
| "stop-in-background", |
| #if defined(OS_ANDROID) |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #else |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| // Freeze scheduler task queues in background on network idle. |
| // This feature only works if stop-in-background is enabled. |
| const base::Feature kFreezeBackgroundTabOnNetworkIdle{ |
| "freeze-background-tab-on-network-idle", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Freeze non-timer task queues in background, after allowed grace time. |
| // "stop" is a legacy name. |
| const base::Feature kStopNonTimersInBackground{ |
| "stop-non-timers-in-background", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enable text snippets in URL fragments. https://crbug.com/919204. |
| const base::Feature kTextFragmentAnchor{"TextFragmentAnchor", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enables the site isolated Wasm code cache that is keyed on the resource URL |
| // and the origin lock of the renderer that is requesting the resource. When |
| // this flag is enabled, content/GeneratedCodeCache handles code cache requests. |
| const base::Feature kWasmCodeCache = {"WasmCodeCache", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Writable files and native file system access. https://crbug.com/853326 |
| const base::Feature kNativeFileSystemAPI{"NativeFileSystemAPI", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // File handling integration. https://crbug.com/829689 |
| const base::Feature kFileHandlingAPI{"FileHandlingAPI", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Allows for synchronous XHR requests during page dismissal |
| const base::Feature kForbidSyncXHRInPageDismissal{ |
| "ForbidSyncXHRInPageDismissal", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Forces the redirect mode for prefetches to kManual. See crbug.com/988956. |
| const base::Feature kPrefetchRedirectError{"PrefetchRedirectError", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| const char kMixedContentAutoupgradeModeParamName[] = "mode"; |
| const char kMixedContentAutoupgradeModeBlockable[] = "blockable"; |
| const char kMixedContentAutoupgradeModeOptionallyBlockable[] = |
| "optionally-blockable"; |
| |
| // Decodes lossy WebP images to YUV instead of RGBX and stores in this format |
| // in the image decode cache. See crbug.com/900264 for details on the feature. |
| const base::Feature kDecodeLossyWebPImagesToYUV{ |
| "DecodeLossyWebPImagesToYUV", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Use accelerated canvases whenever possible see https://crbug.com/909937 |
| const base::Feature kAlwaysAccelerateCanvas{"AlwaysAccelerateCanvas", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enables usage of render frame observer as the receiver of the resource |
| // loading hints in the render process. |
| // https://crbug.com/891328. |
| const base::Feature kSendPreviewsLoadingHintsBeforeCommit{ |
| "SendPreviewsLoadingHintsBeforeCommit", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enables cache-aware WebFonts loading. See https://crbug.com/570205. |
| // The feature is disabled on Android for WebView API issue discussed at |
| // https://crbug.com/942440. |
| const base::Feature kWebFontsCacheAwareTimeoutAdaption { |
| "WebFontsCacheAwareTimeoutAdaption", |
| #if defined(OS_ANDROID) |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #else |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| // Enabled to block programmatic focus in subframes when not triggered by user |
| // activation (see htpps://crbug.com/954349). |
| const base::Feature kBlockingFocusWithoutUserActivation{ |
| "BlockingFocusWithoutUserActivation", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| const base::Feature kAudioWorkletRealtimeThread{ |
| "AudioWorkletRealtimeThread", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // A feature to reduce the set of resources fetched by No-State Prefetch. |
| const base::Feature kLightweightNoStatePrefetch{ |
| "LightweightNoStatePrefetch", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Use scroll gestures for scrollbar scrolls (see https://crbug.com/954007). |
| const base::Feature kScrollbarInjectScrollGestures{ |
| "ScrollbarInjectScrollGestures", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Automatically convert light-themed pages to use a Blink-generated dark theme |
| const base::Feature kForceWebContentsDarkMode{ |
| "WebContentsForceDark", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Which algorithm should be used for color inversion? |
| const base::FeatureParam<ForceDarkInversionMethod>::Option |
| forcedark_inversion_method_options[] = { |
| {ForceDarkInversionMethod::kUseBlinkSettings, |
| "use_blink_settings_for_method"}, |
| {ForceDarkInversionMethod::kHslBased, "hsl_based"}, |
| {ForceDarkInversionMethod::kCielabBased, "cielab_based"}, |
| {ForceDarkInversionMethod::kRgbBased, "rgb_based"}}; |
| |
| const base::FeatureParam<ForceDarkInversionMethod> |
| kForceDarkInversionMethodParam{&kForceWebContentsDarkMode, |
| "inversion_method", |
| ForceDarkInversionMethod::kUseBlinkSettings, |
| &forcedark_inversion_method_options}; |
| |
| // Should images be inverted? |
| const base::FeatureParam<ForceDarkImageBehavior>::Option |
| forcedark_image_behavior_options[] = { |
| {ForceDarkImageBehavior::kUseBlinkSettings, |
| "use_blink_settings_for_images"}, |
| {ForceDarkImageBehavior::kInvertNone, "none"}, |
| {ForceDarkImageBehavior::kInvertSelectively, "selective"}}; |
| |
| const base::FeatureParam<ForceDarkImageBehavior> kForceDarkImageBehaviorParam{ |
| &kForceWebContentsDarkMode, "image_behavior", |
| ForceDarkImageBehavior::kUseBlinkSettings, |
| &forcedark_image_behavior_options}; |
| |
| // Do not invert text lighter than this. |
| // Range: 0 (do not invert any text) to 256 (invert all text) |
| // Can also set to -1 to let Blink's internal settings control the value |
| const base::FeatureParam<int> kForceDarkTextLightnessThresholdParam{ |
| &kForceWebContentsDarkMode, "text_lightness_threshold", -1}; |
| |
| // Do not invert backgrounds darker than this. |
| // Range: 0 (invert all backgrounds) to 256 (invert no backgrounds) |
| // Can also set to -1 to let Blink's internal settings control the value |
| const base::FeatureParam<int> kForceDarkBackgroundLightnessThresholdParam{ |
| &kForceWebContentsDarkMode, "background_lightness_threshold", -1}; |
| |
| bool IsPlzDedicatedWorkerEnabled() { |
| // PlzDedicatedWorker depends on off-the-main-thread dedicated worker script |
| // fetch. |
| #if DCHECK_IS_ON() |
| if (base::FeatureList::IsEnabled(features::kPlzDedicatedWorker)) { |
| DCHECK(base::FeatureList::IsEnabled( |
| features::kOffMainThreadDedicatedWorkerScriptFetch)) |
| << "PlzDedicatedWorker is enabled but " |
| << "OffMainThreadDedicatedWorkerScriptFetch isn't. PlzDedicatedWorker " |
| << "requires OffMainThreadDedicatedWorkerScriptFetch."; |
| } |
| #endif // DCHECK_IS_ON() |
| return base::FeatureList::IsEnabled( |
| features::kOffMainThreadDedicatedWorkerScriptFetch) && |
| base::FeatureList::IsEnabled(features::kPlzDedicatedWorker); |
| } |
| |
| const base::Feature kCanvasAlwaysDeferral{"CanvasAlwaysDeferral", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Use the new C++ implementation of WHATWG Streams. See |
| // https://crbug.com/977500. |
| const base::Feature kStreamsNative{"StreamsNative", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Blink garbage collection. |
| // Enables compaction of backing stores on Blink's heap. |
| const base::Feature kBlinkHeapCompaction{"BlinkHeapCompaction", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| // Enables concurrently marking Blink's heap. |
| const base::Feature kBlinkHeapConcurrentMarking{ |
| "BlinkHeapConcurrentMarking", base::FEATURE_DISABLED_BY_DEFAULT}; |
| // Enables concurrently sweeping Blink's heap. |
| const base::Feature kBlinkHeapConcurrentSweeping{ |
| "BlinkHeapConcurrentSweeping", base::FEATURE_ENABLED_BY_DEFAULT}; |
| // Enables incrementally marking Blink's heap. |
| const base::Feature kBlinkHeapIncrementalMarking{ |
| "BlinkHeapIncrementalMarking", base::FEATURE_ENABLED_BY_DEFAULT}; |
| // Enables a marking stress mode that schedules more garbage collections and |
| // also adds additional verification passes. |
| const base::Feature kBlinkHeapIncrementalMarkingStress{ |
| "BlinkHeapIncrementalMarkingStress", base::FEATURE_DISABLED_BY_DEFAULT}; |
| // Enables unified heap garbage collection scheduling where scheduling is |
| // delegated to V8's heap controller. |
| const base::Feature kBlinkHeapUnifiedGCScheduling{ |
| "BlinkHeapUnifiedGCScheduling", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enables a delay before BufferingBytesConsumer begins reading from its |
| // underlying consumer when instantiated with CreateWithDelay(). |
| const base::Feature kBufferingBytesConsumerDelay{ |
| "BufferingBytesConsumerDelay", base::FEATURE_ENABLED_BY_DEFAULT}; |
| const base::FeatureParam<int> kBufferingBytesConsumerDelayMilliseconds{ |
| &kBufferingBytesConsumerDelay, "milliseconds", 50}; |
| |
| // Enables removing AppCache delays when triggering requests when the HTML was |
| // not fetched from AppCache. |
| const base::Feature kVerifyHTMLFetchedFromAppCacheBeforeDelay{ |
| "VerifyHTMLFetchedFromAppCacheBeforeDelay", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Controls whether we use ThreadPriority::DISPLAY for renderer |
| // compositor & IO threads. |
| const base::Feature kBlinkCompositorUseDisplayThreadPriority { |
| "BlinkCompositorUseDisplayThreadPriority", |
| #if defined(OS_ANDROID) || defined(OS_CHROMEOS) |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #else |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| } // namespace features |
| } // namespace blink |