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

media/formats/mp2t/es_parser_h264_unittest.cc

 // 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.
 
 #include <algorithm>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/memory_mapped_file.h"
@@ skipping 188 matching lines @@
     bool force_timing) {
   EsParserH264 es_parser(
       base::Bind(&EsParserH264Test::NewVideoConfig, base::Unretained(this)),
       base::Bind(&EsParserH264Test::EmitBuffer, base::Unretained(this)));
 
   for (size_t k = 0; k < pes_packets.size(); k++) {
     size_t cur_pes_offset = pes_packets[k].offset;
     size_t cur_pes_size = pes_packets[k].size;
 
     base::TimeDelta pts = kNoTimestamp();
-    base::TimeDelta dts = kNoTimestamp();
+    DecodeTimestamp dts = kNoDecodeTimestamp();
     if (pes_packets[k].pts >= base::TimeDelta() || force_timing)
       pts = pes_packets[k].pts;
 
     ASSERT_TRUE(
         es_parser.Parse(&stream_[cur_pes_offset], cur_pes_size, pts, dts));
   }
   es_parser.Flush();
 }
 
 void EsParserH264Test::EmitBuffer(scoped_refptr<StreamParserBuffer> buffer) {
@@ skipping 70 matching lines @@
   EXPECT_EQ(buffer_count_, access_units_.size());
 
   // Process PES packets forcing timings for each PES packet.
   buffer_count_ = 0;
   ProcessPesPackets(pes_packets, true);
   EXPECT_EQ(buffer_count_, access_units_.size());
 }
 
 }  // namespace mp2t
 }  // namespace media
-