blob: 625676a2065b553fc0e2c6d3935a4441efc8a441 [file] [log] [blame]
// 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 intervention for download that was initiated from or occurred in an ad
// frame without user activation.
const base::Feature kBlockingDownloadsInAdFrameWithoutUserActivation{
"BlockingDownloadsInAdFrameWithoutUserActivation",
base::FEATURE_DISABLED_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_ENABLED_BY_DEFAULT};
// Controls script streaming.
const base::Feature kScriptStreaming{"ScriptStreaming",
base::FEATURE_ENABLED_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_DISABLED_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 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 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_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};
// 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.
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};
const base::Feature kServiceWorkerIsolateInForeground{
"ServiceWorkerIsolateInForeground", base::FEATURE_DISABLED_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};
// 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",
#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 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};
// 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_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};
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