Add --enable-internal-media-session to trigger the MediaSession backend.

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 "media/base/media_switches.h"
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "ppapi/features/features.h"
 
 namespace switches {
@@ skipping 138 matching lines @@
 // 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";
 
 // Ignores all autoplay restrictions. It will ignore the current autoplay policy
 // and all restrictions such as playback in a background tab. It should only be
 // enabled for testing.
 const char kIgnoreAutoplayRestrictionsForTests[] =
     "ignore-autoplay-restrictions";
 
+#if !defined(OS_ANDROID)
+// Turns on the internal media session backend. This should be used by embedders
+// that want to control the media playback with the media session interfaces.
+const char kEnableInternalMediaSession[] = "enable-internal-media-session";
+#endif  // !defined(OS_ANDROID)
+
 namespace autoplay {
 
 // Autoplay policy that does not require any user gesture.
 const char kNoUserGestureRequiredPolicy[] = "no-user-gesture-required";
 
 // Autoplay policy to require a user gesture in order to play.
 const char kUserGestureRequiredPolicy[] = "user-gesture-required";
 
 // Autoplay policy to require a user gesture in ordor to play for cross origin
 // iframes.
@@ skipping 109 matching lines @@
 
   // The default value is platform dependant.
 #if defined(OS_ANDROID)
   return switches::autoplay::kUserGestureRequiredPolicy;
 #else
   return switches::autoplay::kNoUserGestureRequiredPolicy;
 #endif
 }
 
 }  // namespace media