Add WebMediaPlayer::timelineOffset() support to WebMediaPlayerImpl.

media/base/pipeline.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 "media/base/pipeline.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 397 matching lines @@
       }
       if (!audio_renderer_ && !video_renderer_) {
         done_cb.Run(PIPELINE_ERROR_COULD_NOT_RENDER);
         return;
       }
 
       {
         PipelineMetadata metadata;
         metadata.has_audio = audio_renderer_;
         metadata.has_video = video_renderer_;
+        metadata.timeline_offset = demuxer_->GetWallclockTimelineOffset();
         DemuxerStream* stream = demuxer_->GetStream(DemuxerStream::VIDEO);
         if (stream)
           metadata.natural_size = stream->video_decoder_config().natural_size();
         metadata_cb_.Run(metadata);
       }
 
       return DoInitialPreroll(done_cb);
 
     case kStarting:
       return DoPlay(done_cb);
@@ skipping 499 matching lines @@
 void Pipeline::StartClockIfWaitingForTimeUpdate_Locked() {
   lock_.AssertAcquired();
   if (!waiting_for_clock_update_)
     return;
 
   waiting_for_clock_update_ = false;
   clock_->Play();
 }
 
 }  // namespace media