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

media/base/android/media_source_player.cc

 // Copyright (c) 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 "media/base/android/media_source_player.h"
 
 #include <limits>
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
@@ skipping 200 matching lines @@
 bool MediaSourcePlayer::IsPlayerReady() {
   return audio_decoder_job_ || video_decoder_job_;
 }
 
 void MediaSourcePlayer::StartInternal() {
   DVLOG(1) << __FUNCTION__;
   // If there are pending events, wait for them finish.
   if (pending_event_ != NO_EVENT_PENDING)
     return;
 
+  if (!manager()->RequestPlay(player_id()))
+    return;
+
   // When we start, we could have new demuxed data coming in. This new data
   // could be clear (not encrypted) or encrypted with different keys. So key
   // related info should all be cleared.
   is_waiting_for_key_ = false;
   key_added_while_decode_pending_ = false;
   AttachListener(NULL);
 
   SetPendingEvent(PREFETCH_REQUEST_EVENT_PENDING);
   ProcessPendingEvents();
 }
@@ skipping 604 matching lines @@
   // support setMediaKeys(0) (see http://crbug.com/330324), or when we release
   // MediaDrm when the video is paused, or when the device goes to sleep (see
   // http://crbug.com/272421).
   audio_decoder_job_->SetDrmBridge(NULL);
   video_decoder_job_->SetDrmBridge(NULL);
   cdm_registration_id_ = 0;
   drm_bridge_ = NULL;
 }
 
 }  // namespace media