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 25e1e930fcf1bd1099f06477dccc5e237bad8b86..76e5568edd468c5cdb81df04c2808b2e3edf1f76 100644
--- a/ui/compositor/layer.h
+++ b/ui/compositor/layer.h
@@ -320,7 +320,8 @@ 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_; }