1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
// 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/metrics/field_trial.h"
#include "base/strings/string_split.h"
#include "components/scheduler/common/scheduler_switches.h"
#include "content/common/content_switches_internal.h"
#include "content/public/common/content_switches.h"
#include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
#include "ui/gl/gl_switches.h"
#include "ui/native_theme/native_theme_switches.h"
#if defined(OS_ANDROID)
#include <cpu-features.h>
#include "base/android/build_info.h"
#include "base/metrics/field_trial.h"
#include "media/base/android/media_codec_bridge.h"
#elif defined(OS_WIN)
#include "base/win/windows_version.h"
#endif
using blink::WebRuntimeFeatures;
namespace content {
static void SetRuntimeFeatureDefaultsForPlatform() {
// Enable non-standard "apple-touch-icon" and "apple-touch-icon-precomposed".
WebRuntimeFeatures::enableTouchIconLoading(true);
#if defined(OS_ANDROID)
// MSE/EME implementation needs Android MediaCodec API.
if (!media::MediaCodecBridge::IsAvailable()) {
WebRuntimeFeatures::enableMediaSource(false);
WebRuntimeFeatures::enablePrefixedEncryptedMedia(false);
WebRuntimeFeatures::enableEncryptedMedia(false);
}
// WebAudio is enabled by default but only when the MediaCodec API
// is available.
AndroidCpuFamily cpu_family = android_getCpuFamily();
WebRuntimeFeatures::enableWebAudio(
media::MediaCodecBridge::IsAvailable() &&
((cpu_family == ANDROID_CPU_FAMILY_ARM) ||
(cpu_family == ANDROID_CPU_FAMILY_ARM64) ||
(cpu_family == ANDROID_CPU_FAMILY_X86) ||
(cpu_family == ANDROID_CPU_FAMILY_MIPS)));
// Android does not have support for PagePopup
WebRuntimeFeatures::enablePagePopup(false);
// Android does not yet support SharedWorker. crbug.com/154571
WebRuntimeFeatures::enableSharedWorker(false);
// Android does not yet support NavigatorContentUtils.
WebRuntimeFeatures::enableNavigatorContentUtils(false);
WebRuntimeFeatures::enableOrientationEvent(true);
WebRuntimeFeatures::enableFastMobileScrolling(true);
WebRuntimeFeatures::enableMediaCapture(true);
WebRuntimeFeatures::enableCompositedSelectionUpdate(true);
// If navigation transitions gets activated via field trial, enable it in
// blink. We don't set this to false in case the user has manually enabled
// the feature via experimental web platform features.
if (base::FieldTrialList::FindFullName("NavigationTransitions") == "Enabled")
WebRuntimeFeatures::enableNavigationTransitions(true);
// Android won't be able to reliably support non-persistent notifications, the
// intended behavior for which is in flux by itself.
WebRuntimeFeatures::enableNotificationConstructor(false);
#else
WebRuntimeFeatures::enableNavigatorContentUtils(true);
#endif // defined(OS_ANDROID)
#if !(defined OS_ANDROID || defined OS_CHROMEOS || defined OS_IOS)
// Only Android, ChromeOS, and IOS support NetInfo right now.
WebRuntimeFeatures::enableNetworkInformation(false);
#endif
#if defined(OS_WIN)
// Screen Orientation API is currently broken on Windows 8 Metro mode and
// until we can find how to disable it only for Blink instances running in a
// renderer process in Metro, we need to disable the API altogether for Win8.
// See http://crbug.com/400846
if (base::win::OSInfo::GetInstance()->version() >= base::win::VERSION_WIN8)
WebRuntimeFeatures::enableScreenOrientation(false);
#endif // OS_WIN
}
void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
const base::CommandLine& command_line) {
if (command_line.HasSwitch(switches::kEnableExperimentalWebPlatformFeatures))
WebRuntimeFeatures::enableExperimentalFeatures(true);
SetRuntimeFeatureDefaultsForPlatform();
if (command_line.HasSwitch(switches::kDisableDatabases))
WebRuntimeFeatures::enableDatabase(false);
if (command_line.HasSwitch(scheduler::switches::kDisableBlinkScheduler))
WebRuntimeFeatures::enableBlinkScheduler(false);
if (command_line.HasSwitch(switches::kDisableMediaSource))
WebRuntimeFeatures::enableMediaSource(false);
if (command_line.HasSwitch(switches::kDisableNotifications)) {
WebRuntimeFeatures::enableNotifications(false);
// Chrome's Push Messaging implementation relies on Web Notifications.
WebRuntimeFeatures::enablePushMessaging(false);
}
if (command_line.HasSwitch(switches::kDisableSharedWorkers))
WebRuntimeFeatures::enableSharedWorker(false);
#if defined(OS_ANDROID)
// WebAudio is enabled by default on ARM and X86, if the MediaCodec
// API is available.
WebRuntimeFeatures::enableWebAudio(
!command_line.HasSwitch(switches::kDisableWebAudio) &&
media::MediaCodecBridge::IsAvailable());
#else
if (command_line.HasSwitch(switches::kDisableWebAudio))
WebRuntimeFeatures::enableWebAudio(false);
#endif
if (command_line.HasSwitch(switches::kDisableEncryptedMedia))
WebRuntimeFeatures::enableEncryptedMedia(false);
if (command_line.HasSwitch(switches::kDisablePrefixedEncryptedMedia))
WebRuntimeFeatures::enablePrefixedEncryptedMedia(false);
if (command_line.HasSwitch(switches::kDisableFileSystem))
WebRuntimeFeatures::enableFileSystem(false);
if (command_line.HasSwitch(switches::kEnableExperimentalCanvasFeatures))
WebRuntimeFeatures::enableExperimentalCanvasFeatures(true);
if (!command_line.HasSwitch(switches::kDisableAcceleratedJpegDecoding))
WebRuntimeFeatures::enableDecodeToYUV(true);
if (command_line.HasSwitch(switches::kEnableDisplayList2dCanvas))
WebRuntimeFeatures::enableDisplayList2dCanvas(true);
if (command_line.HasSwitch(switches::kDisableDisplayList2dCanvas))
WebRuntimeFeatures::enableDisplayList2dCanvas(false);
if (command_line.HasSwitch(switches::kForceDisplayList2dCanvas))
WebRuntimeFeatures::forceDisplayList2dCanvas(true);
if (command_line.HasSwitch(switches::kEnableWebGLDraftExtensions))
WebRuntimeFeatures::enableWebGLDraftExtensions(true);
if (command_line.HasSwitch(switches::kEnableWebGLImageChromium))
WebRuntimeFeatures::enableWebGLImageChromium(true);
if (command_line.HasSwitch(switches::kEnableOverlayFullscreenVideo))
WebRuntimeFeatures::enableOverlayFullscreenVideo(true);
if (ui::IsOverlayScrollbarEnabled())
WebRuntimeFeatures::enableOverlayScrollbars(true);
if (command_line.HasSwitch(switches::kEnableBleedingEdgeRenderingFastPaths))
WebRuntimeFeatures::enableBleedingEdgeFastPaths(true);
if (command_line.HasSwitch(switches::kEnablePreciseMemoryInfo))
WebRuntimeFeatures::enablePreciseMemoryInfo(true);
if (command_line.HasSwitch(switches::kEnableNetworkInformation) ||
command_line.HasSwitch(
switches::kEnableExperimentalWebPlatformFeatures)) {
WebRuntimeFeatures::enableNetworkInformation(true);
}
if (command_line.HasSwitch(switches::kEnableCredentialManagerAPI))
WebRuntimeFeatures::enableCredentialManagerAPI(true);
if (command_line.HasSwitch(switches::kDisableSVG1DOM)) {
WebRuntimeFeatures::enableSVG1DOM(false);
}
if (command_line.HasSwitch(switches::kReducedReferrerGranularity))
WebRuntimeFeatures::enableReducedReferrerGranularity(true);
if (command_line.HasSwitch(switches::kEnablePushMessagePayload))
WebRuntimeFeatures::enablePushMessagingData(true);
if (command_line.HasSwitch(switches::kEnablePushMessagingHasPermission))
WebRuntimeFeatures::enablePushMessagingHasPermission(true);
// Delete "StaleWhileRevalidate" line from chrome_browser_field_trials.cc
// when this experiment is done.
if (base::FieldTrialList::FindFullName("StaleWhileRevalidate") == "Enabled" ||
command_line.HasSwitch(switches::kEnableStaleWhileRevalidate))
WebRuntimeFeatures::enableStaleWhileRevalidateCacheControl(true);
if (command_line.HasSwitch(switches::kDisableV8IdleTasks))
WebRuntimeFeatures::enableV8IdleTasks(false);
else
WebRuntimeFeatures::enableV8IdleTasks(true);
if (command_line.HasSwitch(switches::kEnableUnsafeES3APIs))
WebRuntimeFeatures::enableUnsafeES3APIs(true);
// Enable explicitly enabled features, and then disable explicitly disabled
// ones.
if (command_line.HasSwitch(switches::kEnableBlinkFeatures)) {
std::vector<std::string> enabled_features;
base::SplitString(
command_line.GetSwitchValueASCII(switches::kEnableBlinkFeatures), ',',
&enabled_features);
for (const std::string& feature : enabled_features) {
WebRuntimeFeatures::enableFeatureFromString(
blink::WebString::fromLatin1(feature), true);
}
}
if (command_line.HasSwitch(switches::kDisableBlinkFeatures)) {
std::vector<std::string> disabled_features;
base::SplitString(
command_line.GetSwitchValueASCII(switches::kDisableBlinkFeatures), ',',
&disabled_features);
for (const std::string& feature : disabled_features) {
WebRuntimeFeatures::enableFeatureFromString(
blink::WebString::fromLatin1(feature), false);
}
}
}
} // namespace content
|
