[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

webkit/renderer/compositor_bindings/web_content_layer_impl.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_CONTENT_LAYER_IMPL_H_
 #define WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_CONTENT_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/layers/content_layer_client.h"
 #include "third_party/WebKit/public/platform/WebContentLayer.h"
@@ skipping 18 matching lines @@
   // WebContentLayer implementation.
   virtual blink::WebLayer* layer();
   virtual void setDoubleSided(bool double_sided);
   virtual void setDrawCheckerboardForMissingTiles(bool checkerboard);
 
  protected:
   virtual ~WebContentLayerImpl();
 
   // ContentLayerClient implementation.
   virtual void PaintContents(SkCanvas* canvas,
-                             gfx::Rect clip,
+                             const gfx::Rect& clip,
                              gfx::RectF* opaque) OVERRIDE;
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE;
 
   scoped_ptr<WebLayerImpl> layer_;
   blink::WebContentLayerClient* client_;
   bool draws_content_;
 
  private:
   bool can_use_lcd_text_;
   bool ignore_lcd_text_change_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentLayerImpl);
 };
 
 }  // namespace webkit
 
 #endif  // WEBKIT_RENDERER_COMPOSITOR_BINDINGS_WEB_CONTENT_LAYER_IMPL_H_