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

media/mp4/mp4_stream_parser.h

Index: media/mp4/mp4_stream_parser.h
diff --git a/media/mp4/mp4_stream_parser.h b/media/mp4/mp4_stream_parser.h
index 41b82720bf041d36bd8f08a1305b3d8aaa98b722..292f6286c594a8337636348deceaa95fc829bbfb 100644
--- a/media/mp4/mp4_stream_parser.h
+++ b/media/mp4/mp4_stream_parser.h
@@ -32,7 +32,8 @@ class MEDIA_EXPORT MP4StreamParser : 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;
 
@@ -85,6 +86,7 @@ class MEDIA_EXPORT MP4StreamParser : public StreamParser {
   NeedKeyCB need_key_cb_;
   NewMediaSegmentCB new_segment_cb_;
   base::Closure end_of_segment_cb_;
+  LogCB log_cb_;
 
   OffsetByteQueue queue_;