Allow StreamParsers to request automatic timestampOffset updates.

media/formats/mpeg/mpeg_audio_stream_parser_base.cc

Index: media/formats/mpeg/mpeg_audio_stream_parser_base.cc
diff --git a/media/formats/mpeg/mpeg_audio_stream_parser_base.cc b/media/formats/mpeg/mpeg_audio_stream_parser_base.cc
index ba3cbd9377f2f4830a15fe1e3353056b2e01e392..aaf6a50bb39d62b851e01ed74f9737b054245479 100644
--- a/media/formats/mpeg/mpeg_audio_stream_parser_base.cc
+++ b/media/formats/mpeg/mpeg_audio_stream_parser_base.cc
@@ -208,7 +208,7 @@ int MPEGAudioStreamParserBase::ParseFrame(const uint8* data,
     bool success = config_cb_.Run(config_, video_config, TextTrackConfigMap());
 
     if (!init_cb_.is_null())
-      base::ResetAndReturn(&init_cb_).Run(success, kInfiniteDuration());
+      base::ResetAndReturn(&init_cb_).Run(success, kInfiniteDuration(), true);
 
     if (!success)
       return -1;
@@ -393,6 +393,7 @@ bool MPEGAudioStreamParserBase::SendBuffers(BufferQueue* buffers,
     end_of_segment_cb_.Run();
   }
 
+  timestamp_helper_->SetBaseTimestamp(base::TimeDelta());
   return true;
 }