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

media/formats/mp2t/es_parser.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_H_
 #define MEDIA_FORMATS_MP2T_ES_PARSER_H_
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "base/time/time.h"
+#include "media/base/stream_parser_buffer.h"
 
 namespace media {
 
 class StreamParserBuffer;
 
 namespace mp2t {
 
 class EsParser {
  public:
   typedef base::Callback<void(scoped_refptr<StreamParserBuffer>)> EmitBufferCB;
 
   EsParser() {}
   virtual ~EsParser() {}
 
   // ES parsing.
   // Should use kNoTimestamp when a timestamp is not valid.
   virtual bool Parse(const uint8* buf, int size,
                      base::TimeDelta pts,
-                     base::TimeDelta dts) = 0;
+                     DecodeTimestamp dts) = 0;
 
   // Flush any pending buffer.
   virtual void Flush() = 0;
 
   // Reset the state of the ES parser.
   virtual void Reset() = 0;
 };
 
 }  // namespace mp2t
 }  // namespace media
 
 #endif