Fire canplaythrough event at the proper time for audio/video

media/base/demuxer.h

Index: media/base/demuxer.h
diff --git a/media/base/demuxer.h b/media/base/demuxer.h
index d6013ff446b75c27f787a50bb8ddd0d375a9d30b..a75f248844cab6d65efa415e7c065ff0ad0e2d61 100644
--- a/media/base/demuxer.h
+++ b/media/base/demuxer.h
@@ -57,6 +57,10 @@ class MEDIA_EXPORT Demuxer
   // Returns the starting time for the media file.
   virtual base::TimeDelta GetStartTime() const = 0;
 
+  // Returns the content bitrate. May be obtained from container or
+  // approximated. Returns 0 if it is unknown.
+  virtual int GetBitrate() = 0;
+
  protected:
   Demuxer();
   FilterHost* host() { return host_; }