[#7] Pass gfx structs by const ref (gfx::Size)

cc/resources/scoped_resource.h

Index: cc/resources/scoped_resource.h
diff --git a/cc/resources/scoped_resource.h b/cc/resources/scoped_resource.h
index 63f2cd48c478fd3518ca2631b5f985a0c390b55a..eebddc19ea1c8819fe847d29f59a22c4b8840ade 100644
--- a/cc/resources/scoped_resource.h
+++ b/cc/resources/scoped_resource.h
@@ -25,10 +25,12 @@ class CC_EXPORT ScopedResource : public Resource {
   }
   virtual ~ScopedResource();
 
-  void Allocate(gfx::Size size,
+  void Allocate(const gfx::Size& size,
                 ResourceProvider::TextureUsageHint hint,
                 ResourceFormat format);
-  void AllocateManaged(gfx::Size size, GLenum target, ResourceFormat format);
+  void AllocateManaged(const gfx::Size& size,
+                       GLenum target,
+                       ResourceFormat format);
   void Free();
   void Leak();