compositor-worker: Refactor CompositorWorkerManager

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index ad108dcd50f2bd88b6b0850b3a13494dcfa24f03..f2a0928f213095c0e3133221f0a3aee670a45c20 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -45,6 +45,7 @@ class WebGamepads;
 class WebGraphicsContext3D;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
+class WebThread;
 }
 
 namespace base {
@@ -588,7 +589,7 @@ class CONTENT_EXPORT RenderThreadImpl
   scoped_ptr<base::Thread> file_thread_;
 
   // May be null if overridden by ContentRendererClient.
-  scoped_ptr<base::Thread> compositor_thread_;
+  scoped_ptr<blink::WebThread> compositor_thread_;
 
   // Utility class to provide GPU functionalities to media.
   scoped_ptr<content::RendererGpuVideoAcceleratorFactories> gpu_factories_;