Track buffered byte ranges correctly in media::Pipeline.

media/filters/chunk_demuxer.cc

Index: media/filters/chunk_demuxer.cc
diff --git a/media/filters/chunk_demuxer.cc b/media/filters/chunk_demuxer.cc
index 6af153a5e025a070fe61ace1edf875f2ecf84e3e..12ac745e9dce4bb125372c74dd4a8131be4c5e8b 100644
--- a/media/filters/chunk_demuxer.cc
+++ b/media/filters/chunk_demuxer.cc
@@ -699,8 +699,9 @@ bool ChunkDemuxer::AppendData(const std::string& id,
     buffered_bytes = buffered_bytes_;
   }
 
-  // Notify the host of 'network activity' because we got data.
-  host_->SetBufferedBytes(buffered_bytes);
+  // Notify the host of 'network activity' because we got data, using a bogus
+  // range.
+  host_->AddBufferedByteRange(0, buffered_bytes);
 
   host_->SetNetworkActivity(true);
 
@@ -833,7 +834,6 @@ void ChunkDemuxer::OnSourceBufferInitDone(bool success,
 
   duration_ = duration;
   host_->SetDuration(duration_);
-  host_->SetCurrentReadPosition(0);
 
   ChangeState_Locked(INITIALIZED);
   PipelineStatusCB cb;