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content_features.cc
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// Copyright 2015 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 "build/build_config.h"
#include "content/public/common/content_features.h"
namespace features {
// All features in alphabetical order.
// Enables content-initiated, main frame navigations to data URLs.
// TODO(meacer): Remove when the deprecation is complete.
// https://www.chromestatus.com/feature/5669602927312896
const base::Feature kAllowContentInitiatedDataUrlNavigations{
"AllowContentInitiatedDataUrlNavigations",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables asm.js to WebAssembly V8 backend.
// http://asmjs.org/spec/latest/
const base::Feature kAsmJsToWebAssembly{"AsmJsToWebAssembly",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables async wheel events.
const base::Feature kAsyncWheelEvents{"AsyncWheelEvents",
base::FEATURE_DISABLED_BY_DEFAULT};
// Block subresource requests whose URLs contain embedded credentials (e.g.
// `https://user:pass@example.com/resource`).
const base::Feature kBlockCredentialedSubresources{
"BlockCredentialedSubresources", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables brotli "Accept-Encoding" advertising and "Content-Encoding" support.
// Brotli format specification: http://www.ietf.org/id/draft-alakuijala-brotli
const base::Feature kBrotliEncoding{"brotli-encoding",
base::FEATURE_ENABLED_BY_DEFAULT};
// Enables browser side navigation (aka PlzNavigate). http://crbug.com/368813
const base::Feature kBrowserSideNavigation{"browser-side-navigation",
base::FEATURE_DISABLED_BY_DEFAULT};
// Toggles whether the buggy RSA parser is used.
//
// TODO(davidben): Remove this after Chrome 61 is released to
// stable. https://crbug.com/735616.
const base::Feature kBuggyRSAParser{"BuggyRSAParser",
base::FEATURE_DISABLED_BY_DEFAULT};
// If Canvas2D Image Chromium is allowed, this feature controls whether it is
// enabled.
const base::Feature kCanvas2DImageChromium{"Canvas2DImageChromium",
base::FEATURE_ENABLED_BY_DEFAULT};
// Enabled decoding images asynchronously from raster in the renderer
// compositor.
const base::Feature kCheckerImaging{"CheckerImaging",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables the compositing of fixed position content that is opaque and can
// preserve LCD text.
const base::Feature kCompositeOpaqueFixedPosition{
"CompositeOpaqueFixedPosition", base::FEATURE_DISABLED_BY_DEFAULT};
// Enables the compositing of scrolling content that supports painting the
// background with the foreground, such that LCD text will still be enabled.
const base::Feature kCompositeOpaqueScrollers{"CompositeOpaqueScrollers",
base::FEATURE_ENABLED_BY_DEFAULT};
// Enables handling touch events in compositor using impl side touch action
// knowledge.
const base::Feature kCompositorTouchAction{"CompositorTouchAction",
base::FEATURE_DISABLED_BY_DEFAULT};
// Speculatively pre-evaluate Javascript which will likely use document.write to
// load an external script. The feature extracts the written markup and sends it
// to the preload scanner.
const base::Feature kDocumentWriteEvaluator{"DocumentWriteEvaluator",
base::FEATURE_DISABLED_BY_DEFAULT};
// Throttle tasks in Blink background timer queues based on CPU budgets
// for the background tab. Bug: https://crbug.com/639852.
const base::Feature kExpensiveBackgroundTimerThrottling{
"ExpensiveBackgroundTimerThrottling", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables the Feature Policy framework for granting and removing access to
// other features through HTTP headers.
const base::Feature kFeaturePolicy{"FeaturePolicy",
base::FEATURE_ENABLED_BY_DEFAULT};
// Enable filtering of same-origin tiny plugins
const base::Feature kFilterSameOriginTinyPlugin{
"FilterSameOriginTinyPlugins", base::FEATURE_DISABLED_BY_DEFAULT};
// Enables Fetch API keepalive timeout setting.
const base::Feature kFetchKeepaliveTimeoutSetting{
"FetchKeepaliveTimeoutSetting", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables a blink::FontCache optimization that reuses a font to serve different
// size of font.
const base::Feature kFontCacheScaling{"FontCacheScaling",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables a security restriction on iframes navigating their top frame.
// When enabled, the navigation will only be permitted if the iframe is
// same-origin to the top frame, or if a user gesture is being processed.
const base::Feature kFramebustingNeedsSameOriginOrUserGesture{
"FramebustingNeedsSameOriginOrUserGesture",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables extended Gamepad API features like motion tracking and haptics.
const base::Feature kGamepadExtensions{"GamepadExtensions",
base::FEATURE_DISABLED_BY_DEFAULT};
// Causes the implementations of guests (inner WebContents) to use
// out-of-process iframes.
const base::Feature kGuestViewCrossProcessFrames{
"GuestViewCrossProcessFrames", base::FEATURE_DISABLED_BY_DEFAULT};
// Enables BlinkGC heap compaction.
const base::Feature kHeapCompaction{"HeapCompaction",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables Blink's idle time spell checker.
// Design: https://goo.gl/zONC3v
// Note: The feature is implemented in Blink, and is independent to the
// ENABLE_SPELLCHECK build flag defined in components/spellcheck.
const base::Feature kIdleTimeSpellChecking{"IdleTimeSpellChecking",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables lazily parsing css properties for performance.
const base::Feature kLazyParseCSS{"LazyParseCSS",
base::FEATURE_DISABLED_BY_DEFAULT};
// Use Mojo IPC for resource loading.
const base::Feature kLoadingWithMojo{"LoadingWithMojo",
base::FEATURE_DISABLED_BY_DEFAULT};
// FeatureList definition for trials to enable the download button on
// MediaDocument.
const base::Feature kMediaDocumentDownloadButton{
"MediaDocumentDownloadButton",
base::FEATURE_DISABLED_BY_DEFAULT
};
// Enables the old algorithm for processing audio constraints in getUserMedia().
const base::Feature kMediaStreamOldAudioConstraints{
"MediaStreamOldAudioConstraints", base::FEATURE_DISABLED_BY_DEFAULT};
// Enables the memory coordinator.
// WARNING:
// The memory coordinator is not ready for use and enabling this may cause
// unexpected memory regression at this point. Please do not enable this.
const base::Feature kMemoryCoordinator {
"MemoryCoordinator", base::FEATURE_DISABLED_BY_DEFAULT
};
// Kill switch for Web Notification content images.
const base::Feature kNotificationContentImage{"NotificationContentImage",
base::FEATURE_ENABLED_BY_DEFAULT};
// An experiment forcing events to be non-blocking when the main thread is
// deemed unresponsive. See crbug.com/599609.
const base::Feature kMainThreadBusyScrollIntervention{
"MainThreadBusyScrollIntervention", base::FEATURE_DISABLED_BY_DEFAULT};
// Blob mojofication.
const base::Feature kMojoBlobs{"MojoBlobs", base::FEATURE_DISABLED_BY_DEFAULT};
// Mojo-based Input Event routing.
const base::Feature kMojoInputMessages{"MojoInputMessages",
base::FEATURE_DISABLED_BY_DEFAULT};
// ES6 Modules.
const base::Feature kModuleScripts{"ModuleScripts",
base::FEATURE_ENABLED_BY_DEFAULT};
// Experimental resource fetch optimizations for workers. See crbug.com/443374
const base::Feature kOffMainThreadFetch{"OffMainThreadFetch",
base::FEATURE_DISABLED_BY_DEFAULT};
// Origin Trials for controlling access to feature/API experiments.
const base::Feature kOriginTrials{"OriginTrials",
base::FEATURE_ENABLED_BY_DEFAULT};
// Whether a download can be handled by parallel jobs.
const base::Feature kParallelDownloading{
"ParallelDownloading", base::FEATURE_DISABLED_BY_DEFAULT};
// Whether document level event listeners should default 'passive' to true.
const base::Feature kPassiveDocumentEventListeners{
"PassiveDocumentEventListeners", base::FEATURE_ENABLED_BY_DEFAULT};
// Whether we should force a touchstart and first touchmove per scroll event
// listeners to be non-blocking during fling.
const base::Feature kPassiveEventListenersDueToFling{
"PassiveEventListenersDueToFling", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables Purge+Throttle on platforms except Android and MacOS.
// (Android) Purge+Throttle depends on TabManager, but TabManager doesn't
// support Android. Enable after Android is supported.
// (MacOS X) Enable after Purge+Throttle handles memory pressure signals
// send by OS correctly.
const base::Feature kPurgeAndSuspend {
"PurgeAndSuspend",
#if defined(OS_MACOSX) || defined(OS_ANDROID)
base::FEATURE_DISABLED_BY_DEFAULT
#else
base::FEATURE_ENABLED_BY_DEFAULT
#endif
};
// RAF aligned mouse input events support.
const base::Feature kRafAlignedMouseInputEvents{
"RafAlignedMouseInput", base::FEATURE_ENABLED_BY_DEFAULT};
// RAF aligned touch input events support.
const base::Feature kRafAlignedTouchInputEvents{
"RafAlignedTouchInput", base::FEATURE_ENABLED_BY_DEFAULT};
// If Pepper 3D Image Chromium is allowed, this feature controls whether it is
// enabled.
const base::Feature kPepper3DImageChromium {
"Pepper3DImageChromium",
#if defined(OS_MACOSX)
base::FEATURE_ENABLED_BY_DEFAULT
#else
base::FEATURE_DISABLED_BY_DEFAULT
#endif
};
// Throttle Blink's rendering pipeline based on frame visibility.
const base::Feature kRenderingPipelineThrottling{
"RenderingPipelineThrottling", base::FEATURE_ENABLED_BY_DEFAULT};
// Require camera/mic requests from pepper plugins to be made from secure
// origins.
const base::Feature kRequireSecureOriginsForPepperMediaRequests{
"RequireSecureOriginsForPepperMediaRequests",
base::FEATURE_ENABLED_BY_DEFAULT};
// Scrolls to compensate for layout movements (bit.ly/scroll-anchoring).
const base::Feature kScrollAnchoring{"ScrollAnchoring",
base::FEATURE_ENABLED_BY_DEFAULT};
// Navigation preload feature of service workers.
const base::Feature kServiceWorkerNavigationPreload{
"ServiceWorkerNavigationPreload", base::FEATURE_ENABLED_BY_DEFAULT};
// Streaming installed scripts on starting service workers.
const base::Feature kServiceWorkerScriptStreaming{
"ServiceWorkerScriptStreaming", base::FEATURE_DISABLED_BY_DEFAULT};
// http://tc39.github.io/ecmascript_sharedmem/shmem.html
const base::Feature kSharedArrayBuffer{"SharedArrayBuffer",
base::FEATURE_ENABLED_BY_DEFAULT};
// An experiment for skipping compositing small scrollers.
const base::Feature kSkipCompositingSmallScrollers{
"SkipCompositingSmallScrollers", base::FEATURE_DISABLED_BY_DEFAULT};
// Paint invalidation based on slimming paint. See https://goo.gl/eQczQW
const base::Feature kSlimmingPaintInvalidation{
"SlimmingPaintInvalidation", base::FEATURE_ENABLED_BY_DEFAULT};
// Throttle Blink timers in out-of-view cross origin frames.
const base::Feature kTimerThrottlingForHiddenFrames{
"TimerThrottlingForHiddenFrames", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables token binding
// (https://www.ietf.org/id/draft-ietf-tokbind-protocol-04.txt).
const base::Feature kTokenBinding{"token-binding",
base::FEATURE_DISABLED_BY_DEFAULT};
// Groups all out-of-process iframes to a different process from the process of
// the top document. This is a performance isolation mode. Launch bug:
// https://crbug.com/595987.
const base::Feature kTopDocumentIsolation{"top-document-isolation",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables touchpad and wheel scroll latching.
const base::Feature kTouchpadAndWheelScrollLatching{
"TouchpadAndWheelScrollLatching", base::FEATURE_DISABLED_BY_DEFAULT};
// Use Feature Policy to gate the use of permission features like midi,
// geolocation, camera, microphone, etc.
const base::Feature kUseFeaturePolicyForPermissions{
"UseFeaturePolicyForPermissions", base::FEATURE_DISABLED_BY_DEFAULT};
// Use MojoAudioOutputIPC and RenderFrameAudioOutputStreamFactory rather than
// AudioMessageFilter and AudioRendererHost.
const base::Feature kUseMojoAudioOutputStreamFactory{
"UseMojoAudioOutputStreamFactory", base::FEATURE_DISABLED_BY_DEFAULT};
// Controls whether vibrate requires user gesture.
const base::Feature kVibrateRequiresUserGesture{
"VibrateRequiresUserGesture", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables VR UI.
const base::Feature kVrShell {
"VrShell",
#if defined(OS_ANDROID)
base::FEATURE_ENABLED_BY_DEFAULT
#else
base::FEATURE_DISABLED_BY_DEFAULT
#endif
};
// Enable WebAssembly structured cloning.
// http://webassembly.org/
const base::Feature kWebAssembly{"WebAssembly",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enable WebAssembly streamed compilation.
const base::Feature kWebAssemblyStreaming{"WebAssemblyStreaming",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enable WebAssembly streamed compilation.
const base::Feature kWebAssemblyTrapHandler{"WebAssemblyTrapHandler",
base::FEATURE_DISABLED_BY_DEFAULT};
// Controls whether the WebAuthentication API is enabled:
// https://w3c.github.io/webauthn
const base::Feature kWebAuth{"WebAuthentication",
base::FEATURE_DISABLED_BY_DEFAULT};
// If WebGL Image Chromium is allowed, this feature controls whether it is
// enabled.
const base::Feature kWebGLImageChromium{"WebGLImageChromium",
base::FEATURE_ENABLED_BY_DEFAULT};
// The JavaScript API for payments on the web.
const base::Feature kWebPayments{"WebPayments",
base::FEATURE_ENABLED_BY_DEFAULT};
// Makes WebRTC use ECDSA certs by default (i.e., when no cert type was
// specified in JS).
const base::Feature kWebRtcEcdsaDefault {"WebRTC-EnableWebRtcEcdsa",
base::FEATURE_ENABLED_BY_DEFAULT};
// Use GpuMemoryBuffer backed VideoFrames in media streams.
const base::Feature kWebRtcUseGpuMemoryBufferVideoFrames{
"WebRTC-UseGpuMemoryBufferVideoFrames",
base::FEATURE_DISABLED_BY_DEFAULT};
// Enables HW H264 encoding on Android.
const base::Feature kWebRtcHWH264Encoding{
"WebRtcHWH264Encoding", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables HW VP8 encoding on Android.
const base::Feature kWebRtcHWVP8Encoding {
"WebRtcHWVP8Encoding",
#if defined(OS_ANDROID)
base::FEATURE_DISABLED_BY_DEFAULT
#else
base::FEATURE_ENABLED_BY_DEFAULT
#endif
};
// Enables the WebRTC Echo Canceller version 3 (AEC3). Feature for
// http://crbug.com/688388. This value is sent to WebRTC's echo canceller to
// toggle which echo canceller should be used.
const base::Feature kWebRtcUseEchoCanceller3{"WebRtcUseEchoCanceller3",
base::FEATURE_DISABLED_BY_DEFAULT};
// Controls whether the WebUSB API is enabled:
// https://wicg.github.io/webusb
const base::Feature kWebUsb{"WebUSB", base::FEATURE_ENABLED_BY_DEFAULT};
// Enables/disables the Image Capture API.
const base::Feature kImageCaptureAPI{"ImageCaptureAPI",
base::FEATURE_ENABLED_BY_DEFAULT};
// Enables WebVR experimental rendering optimizations.
const base::Feature kWebVRExperimentalRendering{
"WebVRExperimentalRendering", base::FEATURE_DISABLED_BY_DEFAULT};
// Make sendBeacon throw for a Blob with a non simple type.
const base::Feature kSendBeaconThrowForBlobWithNonSimpleType{
"SendBeaconThrowForBlobWithNonSimpleType",
base::FEATURE_DISABLED_BY_DEFAULT};
#if defined(OS_ANDROID)
// Autofill Accessibility in Android.
// crbug.com/627860
const base::Feature kAndroidAutofillAccessibility{
"AndroidAutofillAccessibility", base::FEATURE_ENABLED_BY_DEFAULT};
// Service worker based payment apps as defined by w3c here:
// https://w3c.github.io/webpayments-payment-apps-api/
const base::Feature kServiceWorkerPaymentApps{
"ServiceWorkerPaymentApps",
base::FEATURE_DISABLED_BY_DEFAULT};
// Controls whether the WebNFC API is enabled:
// https://w3c.github.io/web-nfc/
const base::Feature kWebNfc{"WebNFC", base::FEATURE_DISABLED_BY_DEFAULT};
#endif
#if defined(OS_WIN)
// Emergency "off switch" for new Windows sandbox security mitigation,
// sandbox::MITIGATION_EXTENSION_POINT_DISABLE.
const base::Feature kWinSboxDisableExtensionPoints{
"WinSboxDisableExtensionPoint", base::FEATURE_ENABLED_BY_DEFAULT};
#endif
#if defined(OS_MACOSX)
// The V2 sandbox on MacOS removes the unsandboed warmup phase and sandboxes the
// entire life of the process.
const base::Feature kMacV2Sandbox{"MacV2Sandbox",
base::FEATURE_DISABLED_BY_DEFAULT};
#endif // defined(OS_MACOSX)
} // namespace features