Create autoplay policy flag and merge cross-origin autoplay blocking into it.

media/base/media_switches.cc

 // Copyright (c) 2012 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 "media/base/media_switches.h"
 #include "ppapi/features/features.h"
 
 namespace switches {
 
 // Allow users to specify a custom buffer size for debugging purpose.
 const char kAudioBufferSize[] = "audio-buffer-size";
 
+// Command line flag name to set the autoplay policy.
+const char kAutoplayPolicy[] = "autoplay-policy";
+
 // Set number of threads to use for video decoding.
 const char kVideoThreads[] = "video-threads";
 
 // Suspend media pipeline on background tabs.
 const char kEnableMediaSuspend[] = "enable-media-suspend";
 const char kDisableMediaSuspend[] = "disable-media-suspend";
 
 // Force to report VP9 as an unsupported MIME type.
 const char kReportVp9AsAnUnsupportedMimeType[] =
     "report-vp9-as-an-unsupported-mime-type";
@@ skipping 104 matching lines @@
 const char kEnableVp9InMp4[] = "enable-vp9-in-mp4";
 
 // Force media player using SurfaceView instead of SurfaceTexture on Android.
 const char kForceVideoOverlays[] = "force-video-overlays";
 
 // Allows explicitly specifying MSE audio/video buffer sizes.
 // Default values are 150M for video and 12M for audio.
 const char kMSEAudioBufferSizeLimit[] = "mse-audio-buffer-size-limit";
 const char kMSEVideoBufferSizeLimit[] = "mse-video-buffer-size-limit";
 
+namespace autoplay {
+
+// Autoplay policy to require a user gesture in ordor to play for cross origin

[Alexei Svitkine (slow), 2017/04/24 18:45:07]

order

+// iframes.
+const char kCrossOriginUserGestureRequiredPolicy[] =
+    "cross-origin-user-gesture-required";
+
+// Autoplay policy to require a user gesture in order to play.
+const char kUserGestureRequiredPolicy[] = "user-gesture-required";
+
+// No autoplay policy.
+const char kNoRestrictionsPolicy[] = "none";
+
+}  // namespace autoplay
+
 }  // namespace switches
 
 namespace media {
 
-#if defined(OS_WIN)
-// Enables video decode acceleration using the D3D11 video decoder api.
-// This is completely insecure - DO NOT USE except for testing.
-const base::Feature kD3D11VideoDecoding{"D3D11VideoDecoding",
-                                        base::FEATURE_DISABLED_BY_DEFAULT};
-
-// Enables H264 HW encode acceleration using Media Foundation for Windows.
-const base::Feature kMediaFoundationH264Encoding{
-    "MediaFoundationH264Encoding", base::FEATURE_ENABLED_BY_DEFAULT};
-#endif  // defined(OS_WIN)
-
 // Use new audio rendering mixer.
 const base::Feature kNewAudioRenderingMixingStrategy{
     "NewAudioRenderingMixingStrategy", base::FEATURE_DISABLED_BY_DEFAULT};
 
 // Only used for disabling overlay fullscreen (aka SurfaceView) in Clank.
 const base::Feature kOverlayFullscreenVideo{"overlay-fullscreen-video",
                                             base::FEATURE_ENABLED_BY_DEFAULT};
 
 // Let videos be resumed via remote controls (for example, the notification)
 // when in background.
@@ skipping 44 matching lines @@
     "VideoFullscreenOrientationLock", base::FEATURE_ENABLED_BY_DEFAULT};
 
 // An experimental feature to enable persistent-license type support in MediaDrm
 // when using Encrypted Media Extensions (EME) API.
 // TODO(xhwang): Remove this after feature launch. See http://crbug.com/493521
 const base::Feature kMediaDrmPersistentLicense{
     "MediaDrmPersistentLicense", base::FEATURE_DISABLED_BY_DEFAULT};
 
 #endif
 
+#if defined(OS_WIN)
+// Enables video decode acceleration using the D3D11 video decoder api.
+// This is completely insecure - DO NOT USE except for testing.
+const base::Feature kD3D11VideoDecoding{"D3D11VideoDecoding",
+                                        base::FEATURE_DISABLED_BY_DEFAULT};
+
+// Enables H264 HW encode acceleration using Media Foundation for Windows.
+const base::Feature kMediaFoundationH264Encoding{
+    "MediaFoundationH264Encoding", base::FEATURE_ENABLED_BY_DEFAULT};
+#endif  // defined(OS_WIN)
+
 }  // namespace media