Make the timestamp unroll offset consistent accross PES pids.

media/formats/mp2t/mp2t_stream_parser.cc

Index: media/formats/mp2t/mp2t_stream_parser.cc
diff --git a/media/formats/mp2t/mp2t_stream_parser.cc b/media/formats/mp2t/mp2t_stream_parser.cc
index 35c61d6bde0bf20d6e4caf59a4d47e769ca79a99..164f2aa9c4d2bd8b2140eed6dfb8096344b0bbf2 100644
--- a/media/formats/mp2t/mp2t_stream_parser.cc
+++ b/media/formats/mp2t/mp2t_stream_parser.cc
@@ -217,6 +217,9 @@ void Mp2tStreamParser::Flush() {
   // Reset the selected PIDs.
   selected_audio_pid_ = -1;
   selected_video_pid_ = -1;
+
+  // Reset the timestamp unroller.
+  timestamp_unroller_.Reset();
 }
 
 bool Mp2tStreamParser::Parse(const uint8* buf, int size) {
@@ -356,7 +359,7 @@ void Mp2tStreamParser::RegisterPes(int pmt_pid,
   // Create the PES state here.
   DVLOG(1) << "Create a new PES state";
   scoped_ptr<TsSection> pes_section_parser(
-      new TsSectionPes(es_parser.Pass()));
+      new TsSectionPes(es_parser.Pass(), &timestamp_unroller_));
   PidState::PidType pid_type =
       is_audio ? PidState::kPidAudioPes : PidState::kPidVideoPes;
   scoped_ptr<PidState> pes_pid_state(