Create abstract interface for media::Pipeline.

media/blink/webmediaplayer_impl.cc

Index: media/blink/webmediaplayer_impl.cc
diff --git a/media/blink/webmediaplayer_impl.cc b/media/blink/webmediaplayer_impl.cc
index e56b4bb17a0bc88f2c75e690abca676b8fcddeb9..f4b61ed1407c8dd4957adb24e2253c4aa6c31db2 100644
--- a/media/blink/webmediaplayer_impl.cc
+++ b/media/blink/webmediaplayer_impl.cc
@@ -1216,7 +1216,8 @@ void WebMediaPlayerImpl::Resume() {
     chunk_demuxer_->StartWaitingForSeek(seek_time_);
 
   resuming_ = true;
-  pipeline_.Resume(CreateRenderer(), seek_time_,
+  scoped_ptr<Renderer> renderer = CreateRenderer();
+  pipeline_.Resume(&renderer, seek_time_,
                    BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked,
                                         time_changed));
 }
@@ -1347,8 +1348,9 @@ void WebMediaPlayerImpl::StartPipeline() {
   seeking_ = true;
 
   // TODO(sandersd): On Android, defer Start() if the tab is not visible.
+  scoped_ptr<Renderer> renderer = CreateRenderer();
   pipeline_.Start(
-      demuxer_.get(), CreateRenderer(),
+      demuxer_.get(), &renderer,
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineEnded),
       BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::OnPipelineError),
       BIND_TO_RENDER_LOOP1(&WebMediaPlayerImpl::OnPipelineSeeked, false),