Plumb audio focus support for spitzer clients.

content/browser/media/android/media_web_contents_observer_android.h

Index: content/browser/media/android/media_web_contents_observer_android.h
diff --git a/content/browser/media/android/media_web_contents_observer_android.h b/content/browser/media/android/media_web_contents_observer_android.h
index 3627aeedf6ed6ddf96b26dea4cf4df302a0410f0..8dd164a32e9db1f4e49bef97e72378033cdcc0ec 100644
--- a/content/browser/media/android/media_web_contents_observer_android.h
+++ b/content/browser/media/android/media_web_contents_observer_android.h
@@ -48,6 +48,10 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
   bool OnMessageReceived(const IPC::Message& message,
                          RenderFrameHost* render_frame_host) override;
 
+ protected:
+  void CheckFocus(int render_frame_id,
+                  const base::Closure& on_focus_cb) override;
+
  private:
   // Handles messages for the media player delgate; does not modify the handled
   // state since the superclass needs to handle these as well.
@@ -92,6 +96,9 @@ class CONTENT_EXPORT MediaWebContentsObserverAndroid
       std::map<MediaPlayerId, scoped_ptr<MediaSessionController>>;
   MediaSessionMap media_session_map_;
 
+  // Map of deferred focus callbacks needing fulfillment.
+  std::map<int, std::vector<base::Closure>> deferred_focus_cbs_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaWebContentsObserverAndroid);
 };