Introduce DecodeTimestamp class to make it easier to distiguish presentation and decode timestamps.

media/formats/mp2t/es_parser_h264.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
 #define MEDIA_FORMATS_MP2T_ES_PARSER_H264_H_
 
 #include <list>
 #include <utility>
 
@@ skipping 25 matching lines @@
  public:
   typedef base::Callback<void(const VideoDecoderConfig&)> NewVideoConfigCB;
 
   EsParserH264(const NewVideoConfigCB& new_video_config_cb,
                const EmitBufferCB& emit_buffer_cb);
   virtual ~EsParserH264();
 
   // EsParser implementation.
   virtual bool Parse(const uint8* buf, int size,
                      base::TimeDelta pts,
-                     base::TimeDelta dts) OVERRIDE;
+                     DecodeTimestamp dts) OVERRIDE;
   virtual void Flush() OVERRIDE;
   virtual void Reset() OVERRIDE;
 
  private:
   struct TimingDesc {
-    base::TimeDelta dts;
+    DecodeTimestamp dts;
     base::TimeDelta pts;
   };
 
   // Find the AUD located at or after |*stream_pos|.
   // Return true if an AUD is found.
   // If found, |*stream_pos| corresponds to the position of the AUD start code
   // in the stream. Otherwise, |*stream_pos| corresponds to the last position
   // of the start code parser.
   bool FindAUD(int64* stream_pos);
 
@@ skipping 26 matching lines @@
   // Last video decoder config.
   VideoDecoderConfig last_video_decoder_config_;
 
   DISALLOW_COPY_AND_ASSIGN(EsParserH264);
 };
 
 }  // namespace mp2t
 }  // namespace media
 
 #endif
-