| // 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 "build/build_config.h" |
| #include "services/network/public/cpp/features.h" |
| |
| namespace blink { |
| namespace features { |
| |
| // 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_ENABLED_BY_DEFAULT}; |
| |
| // Controls script streaming. |
| const base::Feature kScriptStreaming{"ScriptStreaming", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enable FCP++ by experiment. See https://crbug.com/869924 |
| const base::Feature kFirstContentfulPaintPlusPlus{ |
| "FirstContentfulPaintPlusPlus", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Perform memory purges after freezing only if all pages are frozen. |
| const base::Feature kFreezePurgeMemoryAllPagesFrozen{ |
| "FreezePurgeMemoryAllPagesFrozen", 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 compositing mode called BlinkGenPropertyTrees where Blink |
| // generates the compositor property trees. See: https://crbug.com/836884. |
| const base::Feature kBlinkGenPropertyTrees{"BlinkGenPropertyTrees", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // Enable LayoutNG. |
| const base::Feature kLayoutNG{"LayoutNG", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| const base::Feature kMixedContentAutoupgrade{"AutoupgradeMixedContent", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable mojo Blob URL interface and better blob URL lifetime management. |
| // Can be enabled independently of NetworkService. |
| const base::Feature kMojoBlobURLs{"MojoBlobURLs", |
| 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", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable off-the-main-thread dedicated worker script fetch. |
| // (https://crbug.com/835717) |
| const base::Feature kOffMainThreadDedicatedWorkerScriptFetch{ |
| "OffMainThreadDedicatedWorkerScriptFetch", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable off-the-main-thread service worker script fetch. |
| // (https://crbug.com/924043) |
| const base::Feature kOffMainThreadServiceWorkerScriptFetch{ |
| "OffMainThreadServiceWorkerScriptFetch", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enable off-the-main-thread shared worker script fetch. |
| // (https://crbug.com/924041) |
| const base::Feature kOffMainThreadSharedWorkerScriptFetch{ |
| "OffMainThreadSharedWorkerScriptFetch", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Onion souping for all DOMStorage. https://crbug.com/781870 |
| const base::Feature kOnionSoupDOMStorage{"OnionSoupDOMStorage", |
| base::FEATURE_ENABLED_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}; |
| |
| // Enable Implicit Root Scroller. https://crbug.com/903260. |
| const base::Feature kImplicitRootScroller{"ImplicitRootScroller", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| // 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}; |
| |
| // Enables to load the response body through Mojo data pipe passed by |
| // WebURLLoaderClient::DidStartLoadingResponseBody() instead of |
| // WebURLLoaderClient::DidReceiveData(). |
| const base::Feature kResourceLoadViaDataPipe{"ResourceLoadViaDataPipe", |
| base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| const base::Feature kServiceWorkerImportedScriptUpdateCheck{ |
| "ServiceWorkerImportedScriptUpdateCheck", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Enables reading a subresource's body data and side data in parallel. |
| const base::Feature kServiceWorkerParallelSideDataReading{ |
| "ServiceWorkerParallelSideDataReading", base::FEATURE_ENABLED_BY_DEFAULT}; |
| |
| const base::Feature kServiceWorkerAggressiveCodeCache{ |
| "ServiceWorkerAggressiveCodeCache", 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 non-timer task queues in background, after allowed grace time. |
| // "stop" is a legacy name. |
| const base::Feature kStopNonTimersInBackground { |
| "stop-non-timers-in-background", |
| #if defined(OS_ANDROID) |
| base::FEATURE_ENABLED_BY_DEFAULT |
| #else |
| base::FEATURE_DISABLED_BY_DEFAULT |
| #endif |
| }; |
| |
| // 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 filesystem access. https://crbug.com/853326 |
| const base::Feature kNativeFilesystemAPI{"NativeFilesystemAPI", |
| base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Allows for synchronous XHR requests during page dismissal |
| const base::Feature kForbidSyncXHRInPageDismissal{ |
| "ForbidSyncXHRInPageDismissal", base::FEATURE_DISABLED_BY_DEFAULT}; |
| |
| // Emergency lever that can be used to restore DeviceOrientationEvent and |
| // DeviceMotionEvent functionality in non-secure browsing contexts. |
| // See: https://crbug.com/932078. |
| const base::Feature kRestrictDeviceSensorEventsToSecureContexts{ |
| "RestrictDeviceSensorEventsToSecureContexts", |
| base::FEATURE_ENABLED_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_DISABLED_BY_DEFAULT}; |
| |
| bool IsOffMainThreadSharedWorkerScriptFetchEnabled() { |
| // Off-the-main-thread shared worker script fetch depends on PlzSharedWorker |
| // (NetworkService). |
| DCHECK(!base::FeatureList::IsEnabled( |
| features::kOffMainThreadSharedWorkerScriptFetch) || |
| base::FeatureList::IsEnabled(network::features::kNetworkService)) |
| << "OffMainThreadSharedWorkerScriptFetch is enabled but NetworkService " |
| << "isn't. OffMainThreadSharedWorkerScriptFetch requires NetworkService."; |
| return base::FeatureList::IsEnabled(network::features::kNetworkService) && |
| base::FeatureList::IsEnabled( |
| features::kOffMainThreadSharedWorkerScriptFetch); |
| } |
| |
| bool IsPlzDedicatedWorkerEnabled() { |
| // PlzDedicatedWorker depends on off-the-main-thread dedicated worker script |
| // fetch and NetworkService. |
| #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."; |
| DCHECK(base::FeatureList::IsEnabled(network::features::kNetworkService)) |
| << "PlzDedicatedWorker is enabled but NetworkService isn't. " |
| << "PlzDedicatedWorker requires NetworkService."; |
| } |
| #endif // DCHECK_IS_ON() |
| return base::FeatureList::IsEnabled( |
| features::kOffMainThreadDedicatedWorkerScriptFetch) && |
| base::FeatureList::IsEnabled(network::features::kNetworkService) && |
| base::FeatureList::IsEnabled(features::kPlzDedicatedWorker); |
| } |
| |
| } // namespace features |
| } // namespace blink |