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

media/base/android/media_player_bridge.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/android/media_player_bridge.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_string.h"
 #include "base/basictypes.h"
 #include "base/logging.h"
@@ skipping 438 matching lines @@
   ScopedJavaLocalRef<jobject> allowedOperations = GetAllowedOperations();
 
   can_pause_ = Java_AllowedOperations_canPause(env, allowedOperations.obj());
   can_seek_forward_ = Java_AllowedOperations_canSeekForward(
       env, allowedOperations.obj());
   can_seek_backward_ = Java_AllowedOperations_canSeekBackward(
       env, allowedOperations.obj());
 }
 
 void MediaPlayerBridge::StartInternal() {
+  if (!manager()->RequestPlay(player_id())) {
+    Pause(true);

[qinmin, 2015/05/23 18:16:06]

this should be false, see my comments in media_source_player.cc

+    return;
+  }
+
   JNIEnv* env = base::android::AttachCurrentThread();
   Java_MediaPlayerBridge_start(env, j_media_player_bridge_.obj());
   if (!time_update_timer_.IsRunning()) {
     time_update_timer_.Start(
         FROM_HERE,
         base::TimeDelta::FromMilliseconds(kTimeUpdateInterval),
         this, &MediaPlayerBridge::OnTimeUpdateTimerFired);
   }
 
   SetAudible(volume_ > 0);
@@ skipping 56 matching lines @@
 
 GURL MediaPlayerBridge::GetUrl() {
   return url_;
 }
 
 GURL MediaPlayerBridge::GetFirstPartyForCookies() {
   return first_party_for_cookies_;
 }
 
 }  // namespace media