Switch to using media::TimeSource inside media::RendererImpl.

media/base/time_source.h

Index: media/base/time_source.h
diff --git a/media/base/time_source.h b/media/base/time_source.h
index 2c5a72028e9fe3b27dc7f7c87f74fb20feafb65c..59713ff2f6a29283653c3d48f42188da15e2f7c3 100644
--- a/media/base/time_source.h
+++ b/media/base/time_source.h
@@ -34,7 +34,20 @@ class MEDIA_EXPORT TimeSource {
   virtual void SetMediaTime(base::TimeDelta time) = 0;
 
   // Returns the current media time.
+  //
+  // Values returned are intended for informational purposes, such as displaying
+  // UI with the current minute and second count. While it is guaranteed values
+  // will never go backwards, the frequency at which they update may be low.
   virtual base::TimeDelta CurrentMediaTime() = 0;
+
+  // Returns an approximation of the current media time.
+  //
+  // Values returned are intended for interal use only, such as synchronizing
+  // video to audio.
+  //
+  // TODO(scherkus): Replace with a method that returns wall clock time for a
+  // given media time for use with VideoFrameScheduler http://crbug.com/110814
+  virtual base::TimeDelta ApproximateCurrentMediaTime() = 0;

[xhwang, 2014/09/08 22:56:06]

As discussed offline, it's a bit confusing that the non-informational time (more
accurate?) is approximate. How about "RawCurrentMediaTime" or
"CurrentMediaTimeForSync"? Or maybe some comments would help.

[scherkus (not reviewing), 2014/09/09 18:17:18]

Done.

 };
 
 }  // namespace media