Android media: VideoFrame should not store so many sync points.

content/renderer/media/android/webmediaplayer_android.h

Index: content/renderer/media/android/webmediaplayer_android.h
diff --git a/content/renderer/media/android/webmediaplayer_android.h b/content/renderer/media/android/webmediaplayer_android.h
index 7c853e1479e3304faa4a8e439bf450a275dc6395..7bf7e24da35ca7700deb6725a8cabf8107fe5cfa 100644
--- a/content/renderer/media/android/webmediaplayer_android.h
+++ b/content/renderer/media/android/webmediaplayer_android.h
@@ -309,6 +309,9 @@ class WebMediaPlayerAndroid : public blink::WebMediaPlayer,
 
   base::ThreadChecker main_thread_checker_;
 
+  // Message loop for main renderer thread.
+  const scoped_refptr<base::MessageLoopProxy> main_loop_;
+
   // Message loop for media thread.
   const scoped_refptr<base::MessageLoopProxy> media_loop_;