Allow WebExternalTextureLayers to receive a bitmap along with a mailbox

ui/compositor/layer.h

Index: ui/compositor/layer.h
diff --git a/ui/compositor/layer.h b/ui/compositor/layer.h
index d536bf841932e2b48620972b20024b49a92877d0..e1772fad567289c0d63ecf77ed94bc4b769c8277 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -312,7 +312,8 @@ class COMPOSITOR_EXPORT Layer
   // TextureLayerClient
   virtual unsigned PrepareTexture(cc::ResourceUpdateQueue* queue) OVERRIDE;
   virtual WebKit::WebGraphicsContext3D* Context3d() OVERRIDE;
-  virtual bool PrepareTextureMailbox(cc::TextureMailbox* mailbox) OVERRIDE;
+  virtual bool PrepareTextureMailbox(cc::TextureMailbox* mailbox,
+                                     bool use_shared_memory) OVERRIDE;
 
   float device_scale_factor() const { return device_scale_factor_; }