Enable round-tripping and updating of WebSourceBufferImpl timestamp offset

media/filters/chunk_demuxer_unittest.cc

 // Copyright (c) 2012 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 "base/bind.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
@@ skipping 473 matching lines @@
     if (expected_status == PIPELINE_OK)
       expected_duration = kDefaultDuration();
 
     EXPECT_CALL(*this, DemuxerOpened());
     demuxer_->Initialize(
         &host_, CreateInitDoneCB(expected_duration, expected_status), true);
 
     if (AddId(kSourceId, stream_flags) != ChunkDemuxer::kOk)
       return false;
 
+    EXPECT_EQ(kNoTimestamp(), demuxer_->GetUpdatedTimestampOffset(kSourceId));
+
     AppendInitSegmentWithEncryptedInfo(
         kSourceId, stream_flags,
         is_audio_encrypted, is_video_encrypted);
     return true;
   }
 
   bool InitDemuxerAudioAndVideoSourcesText(const std::string& audio_id,
                                            const std::string& video_id,
                                            bool has_text) {
     EXPECT_CALL(*this, DemuxerOpened());
@@ skipping 2638 matching lines @@
   // NOTE: we start at 175 here because the buffer at 125 was returned
   // to the pending read initiated above.
   CheckExpectedBuffers(text_stream, "175 225");
 
   // Verify that audio & video streams contiue to return expected values.
   CheckExpectedBuffers(audio_stream, "160 180");
   CheckExpectedBuffers(video_stream, "180 210");
 }
 
 }  // namespace media