Implemented injected message loops for PipelineImpl.

webkit/glue/webmediaplayer_impl.h

Index: webkit/glue/webmediaplayer_impl.h
diff --git a/webkit/glue/webmediaplayer_impl.h b/webkit/glue/webmediaplayer_impl.h
index 604188c8e3cd46d1b25795682572a74eba09f0cd..b8a44b078d1af3e96081f3bbcf3a66c2d95c015f 100644
--- a/webkit/glue/webmediaplayer_impl.h
+++ b/webkit/glue/webmediaplayer_impl.h
@@ -248,9 +248,9 @@ class WebMediaPlayerImpl : public WebKit::WebMediaPlayer,
   // A collection of factories for creating filters.
   scoped_refptr<media::FilterFactoryCollection> filter_factory_;
 
-  // The actual pipeline. We do it a composition here because we expect to have
-  // the same lifetime as the pipeline.
-  media::PipelineImpl pipeline_;
+  // The actual pipeline and the thread it runs on.
+  scoped_ptr<media::PipelineImpl> pipeline_;
+  base::Thread pipeline_thread_;
 
   WebKit::WebMediaPlayerClient* client_;