Plumb audio focus support for spitzer clients.

content/browser/media/media_web_contents_observer.h

 // Copyright 2014 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_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 #define CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <set>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/web_contents_observer.h"
 
 namespace content {
 class PowerSaveBlocker;
 
 // This class manages all RenderFrame based media related managers at the
 // browser side. It receives IPC messages from media RenderFrameObservers and
@@ skipping 16 matching lines @@
   void WasHidden() override;
 
   bool has_audio_power_save_blocker_for_testing() const {
     return audio_power_save_blocker_;
   }
 
   bool has_video_power_save_blocker_for_testing() const {
     return video_power_save_blocker_;
   }
 
+  // Executes |on_focus_cb| once the given render frame has audio focus.  Will
+  // be run on the calling thread.  Clients are responsible for invalidating
+  // |on_focus_cb| if their lifetime changes or the callback is unnecessary.
+  static void HasAudioFocus(int render_process_id,
+                            int render_frame_id,
+                            const base::Closure& on_focus_cb);
+
+ protected:
+  virtual void CheckFocus(int render_frame_id,
+                          const base::Closure& on_focus_cb);
+
  private:
   void OnMediaDestroyedNotification(RenderFrameHost* render_frame_host,
                                     int64_t player_cookie);
   void OnMediaPlayingNotification(RenderFrameHost* render_frame_host,
                                   int64_t player_cookie,
                                   bool has_video,
                                   bool has_audio,
                                   bool is_remote,
                                   base::TimeDelta duration);
   void OnMediaPausedNotification(RenderFrameHost* render_frame_host,
@@ skipping 31 matching lines @@
   ActiveMediaPlayerMap active_video_players_;
   scoped_ptr<PowerSaveBlocker> audio_power_save_blocker_;
   scoped_ptr<PowerSaveBlocker> video_power_save_blocker_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserver);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_MEDIA_MEDIA_WEB_CONTENTS_OBSERVER_H_