Log MediaSource parsing errors to the MediaLog so they can appear in chrome:media-internals.

media/webm/webm_stream_parser.h

Index: media/webm/webm_stream_parser.h
diff --git a/media/webm/webm_stream_parser.h b/media/webm/webm_stream_parser.h
index 36401510075340f79380b5cab663d23f8d14aa8c..c98805a146f2fd603cf77a011cde7768b439d12f 100644
--- a/media/webm/webm_stream_parser.h
+++ b/media/webm/webm_stream_parser.h
@@ -27,7 +27,8 @@ class WebMStreamParser : public StreamParser {
                     const NewBuffersCB& video_cb,
                     const NeedKeyCB& need_key_cb,
                     const NewMediaSegmentCB& new_segment_cb,
-                    const base::Closure& end_of_segment_cb) OVERRIDE;
+                    const base::Closure& end_of_segment_cb,
+                    const LogCB& log_cb) OVERRIDE;
   virtual void Flush() OVERRIDE;
   virtual bool Parse(const uint8* buf, int size) OVERRIDE;
 
@@ -71,6 +72,7 @@ class WebMStreamParser : public StreamParser {
   NeedKeyCB need_key_cb_;
   NewMediaSegmentCB new_segment_cb_;
   base::Closure end_of_segment_cb_;
+  LogCB log_cb_;
 
   // True if a new cluster id has been seen, but no audio or video buffers have
   // been parsed yet.