Move audio focus control from media/ to content/ and make it per WebContents.

media/base/android/media_player_manager.h

 // 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.
 
 #ifndef MEDIA_BASE_ANDROID_MEDIA_PLAYER_MANAGER_H_
 #define MEDIA_BASE_ANDROID_MEDIA_PLAYER_MANAGER_H_
 
 #include "base/basictypes.h"
 #include "base/time/time.h"
 #include "media/base/android/demuxer_stream_player_params.h"
@@ skipping 60 matching lines @@
   virtual void OnWaitingForDecryptionKey(int player_id) = 0;
 
   // Returns the player that's in the fullscreen mode currently.
   virtual MediaPlayerAndroid* GetFullscreenPlayer() = 0;
 
   // Returns the player with the specified id.
   virtual MediaPlayerAndroid* GetPlayer(int player_id) = 0;
 
   // Called by the player to get a hardware protected surface.
   virtual void RequestFullScreen(int player_id) = 0;
+
+  // Called by the player to request to play. The manager should use this
+  // opportunity to check if the current context is appropriate for a media to
+  // play.
+  // Returns whether the request was granted.
+  virtual bool RequestPlay(int player_id) = 0;

[whywhat, 2015/05/12 12:50:47]

nit: s/RequestPlay/{CanPlay|IsAllowedToPlay}?

[mlamouri (slow - plz ping), 2015/05/19 21:56:17]

I used ::RequestPlay() because it's not just returning a boolean, it's doing
things. CanPlay() or IsAllowedToPlay() might give the wrong impression that this
is just going to return true/false with no side effects.

 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_ANDROID_MEDIA_PLAYER_MANAGER_H_