Implement disabling and enabling media tracks

media/base/pipeline_impl.cc

Index: media/base/pipeline_impl.cc
diff --git a/media/base/pipeline_impl.cc b/media/base/pipeline_impl.cc
index 4b83701c5a6963dce8b28d3673183fce8c36cc5f..a372003faa09b2dc45ac1a8348c2645ab5c4c6f1 100644
--- a/media/base/pipeline_impl.cc
+++ b/media/base/pipeline_impl.cc
@@ -85,6 +85,21 @@ void PipelineImpl::Start(Demuxer* demuxer,
       FROM_HERE, base::Bind(&PipelineImpl::StartTask, weak_this_));
 }
 
+void PipelineImpl::RestartStreamPlayback(DemuxerStream* stream,
+                                         base::TimeDelta time) {
+  DCHECK(main_task_runner_->BelongsToCurrentThread());
+  DVLOG(2) << __FUNCTION__;
+  media_task_runner_->PostTask(
+      FROM_HERE, base::Bind(&PipelineImpl::RestartStreamPlaybackTask,
+                            weak_this_, stream, time));
+}
+
+void PipelineImpl::RestartStreamPlaybackTask(DemuxerStream* stream,
+                                             base::TimeDelta time) {
+  DCHECK(media_task_runner_->BelongsToCurrentThread());
+  renderer_->RestartStreamPlayback(stream, time);
+}
+
 void PipelineImpl::Stop() {
   DCHECK(main_task_runner_->BelongsToCurrentThread());
   DVLOG(2) << __FUNCTION__;