Android: Avoid blocking UI thread for GPU channel creation

content/browser/renderer_host/compositor_impl_android.h

Index: content/browser/renderer_host/compositor_impl_android.h
diff --git a/content/browser/renderer_host/compositor_impl_android.h b/content/browser/renderer_host/compositor_impl_android.h
index b825a315e64fcb570506d7f352db648ce5ad2695..52d1c93425d39441ac9f9e3ae03c2fd9f6c1135a 100644
--- a/content/browser/renderer_host/compositor_impl_android.h
+++ b/content/browser/renderer_host/compositor_impl_android.h
@@ -9,6 +9,7 @@
 #include "base/compiler_specific.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "cc/resources/ui_resource_client.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_host_single_thread_client.h"
@@ -105,6 +106,7 @@ class CONTENT_EXPORT CompositorImpl
   cc::UIResourceId GenerateUIResourceFromUIResourceBitmap(
       const cc::UIResourceBitmap& bitmap,
       bool is_transient);
+  void OnGpuChannelEstablished();
 
   scoped_refptr<cc::Layer> root_layer_;
   scoped_ptr<cc::LayerTreeHost> host_;
@@ -125,6 +127,7 @@ class CONTENT_EXPORT CompositorImpl
   UIResourceMap ui_resource_map_;
 
   gfx::NativeWindow root_window_;
+  base::WeakPtrFactory<CompositorImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositorImpl);
 };