Mute audio for Spitzer playbacks that haven't received focus yet.

content/renderer/media/renderer_webmediaplayer_delegate.h

 // Copyright 2015 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 CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_
 #define CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_
 
 #include "base/id_map.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 35 matching lines @@
   void WasHidden() override;
   void WasShown() override;
   bool OnMessageReceived(const IPC::Message& msg) override;
 
  private:
   void OnMediaDelegatePause(int delegate_id);
   void OnMediaDelegatePlay(int delegate_id);
   void OnMediaDelegateVolumeMultiplierUpdate(int delegate_id,
                                              double multiplier);
 
+  // For platforms which require playback focus approval this will initialize
+  // the volume multiplier to zero.  It will be set correctly by the browser
+  // after playback is approved or the playback will be paused if not.
+  //
+  // Currently this is only done on Android.
+  void MuteObserverUntilPlaybackFocusApproved(int delegate_id);
+
   bool has_played_media_ = false;
   IDMap<Observer> id_map_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebMediaPlayerDelegate);
 };
 
 }  // namespace media
 
 #endif  // CONTENT_RENDERER_MEDIA_RENDERER_WEBMEDIAPLAYER_DELEGATE_H_