blob: 644b595eaf1cbebbf1fe860c0de767ab3404e547 [file] [log] [blame]
// Copyright 2013 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/child/runtime_features.h"
#include <vector>
#include "base/command_line.h"
#include "base/feature_list.h"
#include "base/metrics/field_trial.h"
#include "base/metrics/field_trial_params.h"
#include "base/strings/string_util.h"
#include "build/build_config.h"
#include "content/common/content_switches_internal.h"
#include "content/public/common/content_features.h"
#include "content/public/common/content_switches.h"
#include "content/public/common/navigation_policy.h"
#include "content/public/common/referrer.h"
#include "device/fido/features.h"
#include "gpu/config/gpu_switches.h"
#include "media/base/media_switches.h"
#include "net/base/features.h"
#include "services/device/public/cpp/device_features.h"
#include "services/network/public/cpp/features.h"
#include "services/network/public/cpp/network_switches.h"
#include "third_party/blink/public/common/features.h"
#include "third_party/blink/public/platform/web_runtime_features.h"
#include "ui/accessibility/accessibility_features.h"
#include "ui/base/ui_base_features.h"
#include "ui/events/blink/blink_features.h"
#include "ui/gfx/switches.h"
#include "ui/gl/gl_switches.h"
#include "ui/native_theme/native_theme_features.h"
#if defined(OS_ANDROID)
#include "base/android/build_info.h"
#endif
#if defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
using blink::WebRuntimeFeatures;
namespace {
// Sets blink runtime features for specific platforms.
// This should be a last resort vs runtime_enabled_features.json5.
void SetRuntimeFeatureDefaultsForPlatform(
const base::CommandLine& command_line) {
// Please consider setting up feature defaults for different platforms
// in runtime_enabled_features.json5 instead of here
// TODO(rodneyding): Move the more common cases here
// to baseFeature/switch functions below and move more complex
// ones to special case functions.
#if defined(USE_AURA)
WebRuntimeFeatures::EnableCompositedSelectionUpdate(true);
#endif
#if defined(OS_WIN)
if (base::win::GetVersion() >= base::win::Version::WIN10)
WebRuntimeFeatures::EnableWebBluetooth(true);
#endif
#if defined(SUPPORT_WEBGL2_COMPUTE_CONTEXT)
if (command_line.HasSwitch(switches::kEnableWebGL2ComputeContext)) {
WebRuntimeFeatures::EnableWebGL2ComputeContext(true);
}
#endif
#if defined(OS_MACOSX)
const bool enable_canvas_2d_image_chromium =
command_line.HasSwitch(
switches::kEnableGpuMemoryBufferCompositorResources) &&
!command_line.HasSwitch(switches::kDisable2dCanvasImageChromium) &&
!command_line.HasSwitch(switches::kDisableGpu) &&
base::FeatureList::IsEnabled(features::kCanvas2DImageChromium);
#else
constexpr bool enable_canvas_2d_image_chromium = false;
#endif
WebRuntimeFeatures::EnableCanvas2dImageChromium(
enable_canvas_2d_image_chromium);
#if defined(OS_MACOSX)
const bool enable_web_gl_image_chromium =
command_line.HasSwitch(
switches::kEnableGpuMemoryBufferCompositorResources) &&
!command_line.HasSwitch(switches::kDisableWebGLImageChromium) &&
!command_line.HasSwitch(switches::kDisableGpu) &&
base::FeatureList::IsEnabled(features::kWebGLImageChromium);
#else
const bool enable_web_gl_image_chromium =
command_line.HasSwitch(switches::kEnableWebGLImageChromium);
#endif
WebRuntimeFeatures::EnableWebGLImageChromium(enable_web_gl_image_chromium);
#if defined(OS_ANDROID)
if (command_line.HasSwitch(switches::kDisableMediaSessionAPI))
WebRuntimeFeatures::EnableMediaSession(false);
#endif
#if defined(OS_ANDROID)
WebRuntimeFeatures::EnableWebNfc(
base::FeatureList::IsEnabled(features::kWebNfc));
#endif
#if defined(OS_ANDROID)
// APIs for Web Authentication are not available prior to N.
WebRuntimeFeatures::EnableWebAuth(
base::FeatureList::IsEnabled(features::kWebAuth) &&
base::android::BuildInfo::GetInstance()->sdk_int() >=
base::android::SDK_VERSION_NOUGAT);
#else
WebRuntimeFeatures::EnableWebAuth(
base::FeatureList::IsEnabled(features::kWebAuth));
#endif
WebRuntimeFeatures::EnableWebAuthenticationFeaturePolicy(
base::FeatureList::IsEnabled(device::kWebAuthFeaturePolicy));
#if defined(OS_ANDROID)
WebRuntimeFeatures::EnablePictureInPictureAPI(
base::FeatureList::IsEnabled(media::kPictureInPictureAPI));
#endif
#if defined(OS_ANDROID)
if (base::android::BuildInfo::GetInstance()->sdk_int() >=
base::android::SDK_VERSION_P) {
// Display Cutout is limited to Android P+.
WebRuntimeFeatures::EnableDisplayCutoutAPI(true);
}
#endif
#if defined(OS_ANDROID)
WebRuntimeFeatures::EnableMediaControlsExpandGesture(
base::FeatureList::IsEnabled(media::kMediaControlsExpandGesture));
#endif
}
enum RuntimeFeatureEnableOptions {
// Always set the Blink feature to the enabled state of the base::Feature.
// Example: A run time feature that is completely controlled
// by base::Feature.
kUseFeatureState,
// Enables the Blink feature when the base::Feature is enabled,
// otherwise no change.
kEnableOnly,
// Disables the Blink feature when the base::Feature is *disabled*,
// otherwise no change.
kDisableOnly,
};
template <typename T>
// Helper class that describes the desired actions for the runtime feature
// depending on a check for chromium base::Feature.
struct RuntimeFeatureToChromiumFeatureMap {
// This can be either an enabler function defined in web_runtime_features.cc
// or the string name of the feature in runtime_enabled_features.json5.
T feature_enabler;
// The chromium base::Feature to check.
const base::Feature& chromium_feature;
const RuntimeFeatureEnableOptions option;
};
// Sets blink runtime features that are either directly
// controlled by Chromium base::Feature or are overridden
// by base::Feature states.
void SetRuntimeFeaturesFromChromiumFeatures() {
using wf = WebRuntimeFeatures;
// To add a runtime feature control, add a new
// RuntimeFeatureToChromiumFeatureMap entry here if there is a custom
// enabler function defined. Otherwise add the entry with string name
// in the next list.
const RuntimeFeatureToChromiumFeatureMap<void (*)(bool)>
blinkFeatureToBaseFeatureMapping[] = {
// TODO(rodneyding): Sort features in alphabetical order
{wf::EnableWebUsb, features::kWebUsb, kDisableOnly},
{wf::EnableBlockingFocusWithoutUserActivation,
blink::features::kBlockingFocusWithoutUserActivation, kEnableOnly},
{wf::EnableNotificationContentImage,
features::kNotificationContentImage, kDisableOnly},
{wf::EnablePeriodicBackgroundSync, features::kPeriodicBackgroundSync,
kEnableOnly},
{wf::EnableWebXR, features::kWebXr, kUseFeatureState},
{wf::EnableWebXRARDOMOverlay, features::kWebXrArDOMOverlay,
kEnableOnly},
{wf::EnableWebXRARModule, features::kWebXrArModule, kEnableOnly},
{wf::EnableWebXRHitTest, features::kWebXrHitTest, kEnableOnly},
{wf::EnableWebXRAnchors, features::kWebXrAnchors, kEnableOnly},
{wf::EnableWebXRPlaneDetection, features::kWebXrPlaneDetection,
kEnableOnly},
{wf::EnableWebXrGamepadModule, features::kWebXrGamepadModule,
kUseFeatureState},
{wf::EnableFetchMetadata, network::features::kFetchMetadata,
kUseFeatureState},
{wf::EnableFetchMetadataDestination,
network::features::kFetchMetadataDestination, kUseFeatureState},
{wf::EnableUserActivationPostMessageTransfer,
features::kUserActivationPostMessageTransfer, kUseFeatureState},
{wf::EnableUserActivationSameOriginVisibility,
features::kUserActivationSameOriginVisibility, kUseFeatureState},
{wf::EnablePassiveDocumentEventListeners,
features::kPassiveDocumentEventListeners, kUseFeatureState},
{wf::EnablePassiveDocumentWheelEventListeners,
features::kPassiveDocumentWheelEventListeners, kUseFeatureState},
{wf::EnableExpensiveBackgroundTimerThrottling,
features::kExpensiveBackgroundTimerThrottling, kUseFeatureState},
{wf::EnableTimerThrottlingForHiddenFrames,
features::kTimerThrottlingForHiddenFrames, kUseFeatureState},
{wf::EnableSendBeaconThrowForBlobWithNonSimpleType,
features::kSendBeaconThrowForBlobWithNonSimpleType, kEnableOnly},
{wf::EnablePaymentRequest, features::kWebPayments, kUseFeatureState},
{wf::EnablePaymentApp, features::kServiceWorkerPaymentApps,
kEnableOnly},
{wf::EnableCompositorTouchAction, features::kCompositorTouchAction,
kEnableOnly},
{wf::EnableGenericSensorExtraClasses,
features::kGenericSensorExtraClasses, kEnableOnly},
{wf::EnableMediaCastOverlayButton, media::kMediaCastOverlayButton,
kUseFeatureState},
{wf::EnableBuiltInModuleAll, features::kBuiltInModuleAll,
kEnableOnly},
{wf::EnableBuiltInModuleInfra, features::kBuiltInModuleInfra,
kEnableOnly},
{wf::EnableBuiltInModuleKvStorage, features::kBuiltInModuleKvStorage,
kEnableOnly},
{wf::EnableLazyInitializeMediaControls,
features::kLazyInitializeMediaControls, kUseFeatureState},
{wf::EnableMediaEngagementBypassAutoplayPolicies,
media::kMediaEngagementBypassAutoplayPolicies, kUseFeatureState},
{wf::EnableOverflowIconsForMediaControls,
media::kOverflowIconsForMediaControls, kUseFeatureState},
{wf::EnableAllowActivationDelegationAttr,
features::kAllowActivationDelegationAttr, kUseFeatureState},
{wf::EnableScriptStreamingOnPreload,
features::kScriptStreamingOnPreload, kUseFeatureState},
{wf::EnableLazyFrameLoading, features::kLazyFrameLoading,
kUseFeatureState},
{wf::EnableLazyFrameVisibleLoadTimeMetrics,
features::kLazyFrameVisibleLoadTimeMetrics, kUseFeatureState},
{wf::EnableLazyImageLoading, features::kLazyImageLoading,
kUseFeatureState},
{wf::EnableLazyImageVisibleLoadTimeMetrics,
features::kLazyImageVisibleLoadTimeMetrics, kUseFeatureState},
{wf::EnablePictureInPicture, media::kPictureInPicture,
kUseFeatureState},
{wf::EnableCacheInlineScriptCode, features::kCacheInlineScriptCode,
kUseFeatureState},
{wf::EnableWasmCodeCache, blink::features::kWasmCodeCache,
kUseFeatureState},
{wf::EnableExperimentalProductivityFeatures,
features::kExperimentalProductivityFeatures, kEnableOnly},
{wf::EnableFeaturePolicyForSandbox,
features::kFeaturePolicyForSandbox, kEnableOnly},
{wf::EnableAccessibilityExposeARIAAnnotations,
features::kEnableAccessibilityExposeARIAAnnotations,
kUseFeatureState},
{wf::EnableAccessibilityExposeDisplayNone,
features::kEnableAccessibilityExposeDisplayNone, kUseFeatureState},
{wf::EnableAllowSyncXHRInPageDismissal,
blink::features::kAllowSyncXHRInPageDismissal, kEnableOnly},
{wf::EnableAutoplayIgnoresWebAudio, media::kAutoplayIgnoreWebAudio,
kUseFeatureState},
{wf::EnablePortals, blink::features::kPortals, kUseFeatureState},
{wf::EnableImplicitRootScroller,
blink::features::kImplicitRootScroller, kUseFeatureState},
{wf::EnableCSSOMViewScrollCoordinates,
blink::features::kCSSOMViewScrollCoordinates, kEnableOnly},
{wf::EnableTextFragmentAnchor, blink::features::kTextFragmentAnchor,
kUseFeatureState},
{wf::EnableBackgroundFetch, features::kBackgroundFetch, kDisableOnly},
{wf::EnableUpdateHoverAtBeginFrame,
features::kUpdateHoverAtBeginFrame, kUseFeatureState},
{wf::EnableForcedColors, features::kForcedColors, kUseFeatureState},
{wf::EnableFractionalScrollOffsets,
features::kFractionalScrollOffsets, kUseFeatureState},
{wf::EnableGetDisplayMedia, blink::features::kRTCGetDisplayMedia,
kUseFeatureState},
{wf::EnableFallbackCursorMode, features::kFallbackCursorMode,
kUseFeatureState},
{wf::EnableSignedExchangePrefetchCacheForNavigations,
features::kSignedExchangePrefetchCacheForNavigations,
kUseFeatureState},
{wf::EnableSignedExchangeSubresourcePrefetch,
features::kSignedExchangeSubresourcePrefetch, kUseFeatureState},
{wf::EnableIdleDetection, features::kIdleDetection, kDisableOnly},
{wf::EnableSkipTouchEventFilter, features::kSkipTouchEventFilter,
kUseFeatureState},
{wf::EnableSmsReceiver, features::kSmsReceiver, kDisableOnly},
{wf::EnableDisplayLocking, blink::features::kDisplayLocking,
kUseFeatureState},
{wf::EnableConsolidatedMovementXY, features::kConsolidatedMovementXY,
kUseFeatureState},
{wf::EnableCooperativeScheduling, features::kCooperativeScheduling,
kUseFeatureState},
{wf::EnableMouseSubframeNoImplicitCapture,
features::kMouseSubframeNoImplicitCapture, kUseFeatureState},
{wf::EnableCookieDeprecationMessages,
features::kCookieDeprecationMessages, kEnableOnly},
{wf::EnableSameSiteByDefaultCookies,
net::features::kSameSiteByDefaultCookies, kEnableOnly},
{wf::EnableCookiesWithoutSameSiteMustBeSecure,
net::features::kCookiesWithoutSameSiteMustBeSecure, kEnableOnly},
{wf::EnablePointerLockOptions, features::kPointerLockOptions,
kEnableOnly},
{wf::EnableDocumentPolicy, features::kDocumentPolicy,
kUseFeatureState},
{wf::EnableNeverSlowMode, features::kNeverSlowMode, kUseFeatureState},
{wf::EnableShadowDOMV0, blink::features::kWebComponentsV0Enabled,
kEnableOnly},
{wf::EnableCustomElementsV0, blink::features::kWebComponentsV0Enabled,
kEnableOnly},
{wf::EnableHTMLImports, blink::features::kWebComponentsV0Enabled,
kEnableOnly},
};
for (const auto& mapping : blinkFeatureToBaseFeatureMapping) {
const bool featureEnabled =
base::FeatureList::IsEnabled(mapping.chromium_feature);
switch (mapping.option) {
case kEnableOnly:
if (featureEnabled)
mapping.feature_enabler(true);
break;
case kDisableOnly:
if (!featureEnabled)
mapping.feature_enabler(false);
break;
case kUseFeatureState:
mapping.feature_enabler(featureEnabled);
}
}
// TODO(crbug/832393): Cleanup the inconsistency between custom WRF enabler
// function and using feature string name with EnableFeatureFromString.
const RuntimeFeatureToChromiumFeatureMap<const char*>
runtimeFeatureNameToChromiumFeatureMapping[] = {
{"FastBorderRadius", blink::features::kFastBorderRadius,
kUseFeatureState},
{"FontSrcLocalMatching", features::kFontSrcLocalMatching,
kUseFeatureState},
{"LegacyWindowsDWriteFontFallback",
features::kLegacyWindowsDWriteFontFallback, kUseFeatureState},
{"AddressSpace", network::features::kBlockNonSecureExternalRequests,
kEnableOnly},
{"BlockCredentialedSubresources",
features::kBlockCredentialedSubresources, kDisableOnly},
{"AllowContentInitiatedDataUrlNavigations",
features::kAllowContentInitiatedDataUrlNavigations,
kUseFeatureState},
{"LayoutNG", blink::features::kLayoutNG, kUseFeatureState},
{"UserAgentClientHint", features::kUserAgentClientHint, kEnableOnly},
{"AudioWorkletRealtimeThread",
blink::features::kAudioWorkletRealtimeThread, kEnableOnly},
{"TrustedDOMTypes", features::kTrustedDOMTypes, kEnableOnly},
{"IgnoreCrossOriginWindowWhenNamedAccessOnWindow",
blink::features::kIgnoreCrossOriginWindowWhenNamedAccessOnWindow,
kEnableOnly},
{"StorageAccessAPI", blink::features::kStorageAccessAPI, kEnableOnly},
{"ShadowDOMV0", blink::features::kWebComponentsV0Enabled,
kEnableOnly},
{"CustomElementsV0", blink::features::kWebComponentsV0Enabled,
kEnableOnly},
{"HTMLImports", blink::features::kWebComponentsV0Enabled,
kEnableOnly},
};
for (const auto& mapping : runtimeFeatureNameToChromiumFeatureMapping) {
const bool featureEnabled =
base::FeatureList::IsEnabled(mapping.chromium_feature);
switch (mapping.option) {
case kEnableOnly:
if (featureEnabled)
wf::EnableFeatureFromString(mapping.feature_enabler, true);
break;
case kDisableOnly:
if (!featureEnabled)
wf::EnableFeatureFromString(mapping.feature_enabler, false);
break;
case kUseFeatureState:
wf::EnableFeatureFromString(mapping.feature_enabler, featureEnabled);
}
}
}
// Helper class that describes the desired enable/disable action
// for a runtime feature when a command line switch exists.
struct SwitchToFeatureMap {
// The enabler function defined in web_runtime_features.cc.
void (*feature_enabler)(bool);
// The switch to check for on command line.
const char* switch_name;
// This is the desired state for the runtime feature if the
// switch exists on command line.
bool target_enabled_state;
};
// Sets blink runtime features controlled by command line switches.
void SetRuntimeFeaturesFromCommandLine(const base::CommandLine& command_line) {
// To add a new switch-controlled runtime feature, add a new
// SwitchToFeatureMap entry to the initializer list below.
// Note: command line switches are now discouraged, please consider
// using base::Feature instead.
// https://chromium.googlesource.com/chromium/src/+/refs/heads/master/docs/configuration.md#switches
using wrf = WebRuntimeFeatures;
const SwitchToFeatureMap switchToFeatureMapping[] = {
// Stable Features
{wrf::EnablePermissionsAPI, switches::kDisablePermissionsAPI, false},
{wrf::EnablePresentationAPI, switches::kDisablePresentationAPI, false},
{wrf::EnableRemotePlaybackAPI, switches::kDisableRemotePlaybackAPI,
false},
{wrf::EnableTimerThrottlingForBackgroundTabs,
switches::kDisableBackgroundTimerThrottling, false},
// End of Stable Features
{wrf::EnableDatabase, switches::kDisableDatabases, false},
{wrf::EnableNotifications, switches::kDisableNotifications, false},
// Chrome's Push Messaging implementation relies on Web Notifications.
{wrf::EnablePushMessaging, switches::kDisableNotifications, false},
{wrf::EnableSharedWorker, switches::kDisableSharedWorkers, false},
{wrf::EnableScriptedSpeechRecognition, switches::kDisableSpeechAPI,
false},
{wrf::EnableScriptedSpeechSynthesis, switches::kDisableSpeechAPI, false},
{wrf::EnableScriptedSpeechSynthesis, switches::kDisableSpeechSynthesisAPI,
false},
{wrf::EnableFileSystem, switches::kDisableFileSystem, false},
{wrf::EnableWebGLDraftExtensions, switches::kEnableWebGLDraftExtensions,
true},
{wrf::EnableAutomationControlled, switches::kEnableAutomation, true},
{wrf::EnableAutomationControlled, switches::kHeadless, true},
{wrf::EnableAutomationControlled, switches::kRemoteDebuggingPipe, true},
{wrf::EnableAutomationControlled, switches::kRemoteDebuggingPort, true},
{wrf::ForceOverlayFullscreenVideo, switches::kForceOverlayFullscreenVideo,
true},
{wrf::EnablePreciseMemoryInfo, switches::kEnablePreciseMemoryInfo, true},
{wrf::EnablePrintBrowser, switches::kEnablePrintBrowser, true},
{wrf::EnableNetInfoDownlinkMax,
switches::kEnableNetworkInformationDownlinkMax, true},
{wrf::EnablePermissionsAPI, switches::kDisablePermissionsAPI, false},
{wrf::EnableWebGPU, switches::kEnableUnsafeWebGPU, true},
{wrf::EnablePresentationAPI, switches::kDisablePresentationAPI, false},
{wrf::EnableRemotePlaybackAPI, switches::kDisableRemotePlaybackAPI,
false},
{wrf::EnableTimerThrottlingForBackgroundTabs,
switches::kDisableBackgroundTimerThrottling, false},
{wrf::EnableAccessibilityObjectModel,
switches::kEnableAccessibilityObjectModel, true},
{wrf::EnableAllowSyncXHRInPageDismissal,
switches::kAllowSyncXHRInPageDismissal, true},
{wrf::EnableShadowDOMV0, switches::kWebComponentsV0Enabled, true},
{wrf::EnableCustomElementsV0, switches::kWebComponentsV0Enabled, true},
{wrf::EnableHTMLImports, switches::kWebComponentsV0Enabled, true},
};
for (const auto& mapping : switchToFeatureMapping) {
if (command_line.HasSwitch(mapping.switch_name))
mapping.feature_enabler(mapping.target_enabled_state);
}
}
// Sets blink runtime features controlled by FieldTrial parameter values.
void SetRuntimeFeaturesFromFieldTrialParams() {
// Automatic lazy frame loading by default is enabled and restricted to users
// with Lite Mode (aka Data Saver) turned on. Note that in practice, this also
// restricts automatic lazy loading by default to Android, since Lite Mode is
// only accessible through UI on Android.
WebRuntimeFeatures::EnableAutomaticLazyFrameLoading(
base::GetFieldTrialParamByFeatureAsBool(
features::kLazyFrameLoading, "automatic-lazy-load-frames-enabled",
true));
WebRuntimeFeatures::EnableRestrictAutomaticLazyFrameLoadingToDataSaver(
base::GetFieldTrialParamByFeatureAsBool(
features::kLazyFrameLoading,
"restrict-lazy-load-frames-to-data-saver-only", true));
WebRuntimeFeatures::EnableAutoLazyLoadOnReloads(
base::GetFieldTrialParamByFeatureAsBool(
features::kLazyFrameLoading, "enable-lazy-load-on-reload", false));
// Automatic lazy image loading by default is enabled and restricted to users
// with Lite Mode (aka Data Saver) turned on. Note that in practice, this also
// restricts automatic lazy loading by default to Android, since Lite Mode is
// only accessible through UI on Android.
WebRuntimeFeatures::EnableAutomaticLazyImageLoading(
base::GetFieldTrialParamByFeatureAsBool(
features::kLazyImageLoading, "automatic-lazy-load-images-enabled",
true));
WebRuntimeFeatures::EnableRestrictAutomaticLazyImageLoadingToDataSaver(
base::GetFieldTrialParamByFeatureAsBool(
features::kLazyImageLoading,
"restrict-lazy-load-images-to-data-saver-only", true));
WebRuntimeFeatures::EnableLazyImageLoadingMetadataFetch(
base::GetFieldTrialParamByFeatureAsBool(
features::kLazyImageLoading, "enable-lazy-load-images-metadata-fetch",
false));
}
// Sets blink runtime features that depend on a combination
// of args rather than a single check of base::Feature or switch.
// This can be a combination of both or custom checking logic
// not covered by other functions. In short, this should be used
// as a last resort.
void SetCustomizedRuntimeFeaturesFromCombinedArgs(
const base::CommandLine& command_line,
bool enable_experimental_web_platform_features) {
// CAUTION: Only add custom enabling logic here if it cannot
// be covered by the other functions.
if (!command_line.HasSwitch(switches::kDisableYUVImageDecoding) &&
base::FeatureList::IsEnabled(
blink::features::kDecodeJpeg420ImagesToYUV)) {
WebRuntimeFeatures::EnableDecodeJpeg420ImagesToYUV(true);
}
if (!command_line.HasSwitch(switches::kDisableYUVImageDecoding) &&
base::FeatureList::IsEnabled(
blink::features::kDecodeLossyWebPImagesToYUV)) {
WebRuntimeFeatures::EnableDecodeLossyWebPImagesToYUV(true);
}
WebRuntimeFeatures::EnableSharedArrayBuffer(
base::FeatureList::IsEnabled(features::kSharedArrayBuffer) ||
base::FeatureList::IsEnabled(features::kWebAssemblyThreads));
// These checks are custom wrappers around base::FeatureList::IsEnabled
// They're moved here to distinguish them from actual base checks
WebRuntimeFeatures::EnableOverlayScrollbars(ui::IsOverlayScrollbarEnabled());
WebRuntimeFeatures::EnableFormControlsRefresh(
features::IsFormControlsRefreshEnabled());
if (base::FeatureList::GetInstance()->IsFeatureOverriddenFromCommandLine(
blink::features::kNativeFileSystemAPI.name,
base::FeatureList::OVERRIDE_ENABLE_FEATURE)) {
WebRuntimeFeatures::EnableFeatureFromString("NativeFileSystem", true);
}
if (base::FeatureList::IsEnabled(blink::features::kNativeFileSystemAPI) &&
base::FeatureList::IsEnabled(blink::features::kFileHandlingAPI)) {
WebRuntimeFeatures::EnableFeatureFromString("FileHandling", true);
}
// TODO(rodneyding): This is a rare case for a stable feature
// Need to investigate more to determine whether to refactor it.
if (command_line.HasSwitch(switches::kDisableV8IdleTasks))
WebRuntimeFeatures::EnableV8IdleTasks(false);
else
WebRuntimeFeatures::EnableV8IdleTasks(true);
// This is a hack to get the tests passing as they require
// these blink features to be enabled while they are disabled
// by base::Feature controls earlier in code.
// TODO(rodneyding): Investigate more on proper treatments of
// these features.
if (enable_experimental_web_platform_features) {
WebRuntimeFeatures::EnableNetInfoDownlinkMax(true);
WebRuntimeFeatures::EnableFetchMetadata(true);
WebRuntimeFeatures::EnableFetchMetadataDestination(true);
WebRuntimeFeatures::EnableFeatureFromString("FastBorderRadius", true);
WebRuntimeFeatures::EnableDisplayLocking(true);
}
WebRuntimeFeatures::EnableBackForwardCache(
content::IsBackForwardCacheEnabled());
// Gate the ReducedReferrerGranularity runtime feature depending on whether
// content is configured to force a no-referrer-when-downgrade default policy.
// TODO(crbug.com/1016541): After M82, remove when the corresponding
// enterprise policy has been deleted.
WebRuntimeFeatures::EnableReducedReferrerGranularity(
base::FeatureList::IsEnabled(features::kReducedReferrerGranularity) &&
!content::Referrer::ShouldForceLegacyDefaultReferrerPolicy());
}
} // namespace
namespace content {
void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
const base::CommandLine& command_line) {
// Sets experimental features.
bool enable_experimental_web_platform_features =
command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures);
if (enable_experimental_web_platform_features)
WebRuntimeFeatures::EnableExperimentalFeatures(true);
SetRuntimeFeatureDefaultsForPlatform(command_line);
// Sets origin trial features.
if (command_line.HasSwitch(
switches::kDisableOriginTrialControlledBlinkFeatures)) {
WebRuntimeFeatures::EnableOriginTrialControlledFeatures(false);
}
if (!command_line.HasSwitch(
network::switches::kForceToDisableOutOfBlinkCors) &&
base::FeatureList::IsEnabled(network::features::kOutOfBlinkCors)) {
WebRuntimeFeatures::EnableOutOfBlinkCors(true);
}
// TODO(rodneyding): add doc explaining ways to add new runtime features
// controls in the following functions.
SetRuntimeFeaturesFromChromiumFeatures();
SetRuntimeFeaturesFromCommandLine(command_line);
SetRuntimeFeaturesFromFieldTrialParams();
SetCustomizedRuntimeFeaturesFromCombinedArgs(
command_line, enable_experimental_web_platform_features);
// Enable explicitly enabled features, and then disable explicitly disabled
// ones.
for (const std::string& feature :
FeaturesFromSwitch(command_line, switches::kEnableBlinkFeatures)) {
WebRuntimeFeatures::EnableFeatureFromString(feature, true);
}
for (const std::string& feature :
FeaturesFromSwitch(command_line, switches::kDisableBlinkFeatures)) {
WebRuntimeFeatures::EnableFeatureFromString(feature, false);
}
}
} // namespace content