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

cc/test/fake_content_layer_client.h

 // Copyright 2012 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 CC_TEST_FAKE_CONTENT_LAYER_CLIENT_H_
 #define CC_TEST_FAKE_CONTENT_LAYER_CLIENT_H_
 
 #include <utility>
 #include <vector>
 
@@ skipping 10 matching lines @@
   struct BitmapData {
     SkBitmap bitmap;
     gfx::Point point;
     SkPaint paint;
   };
 
   FakeContentLayerClient();
   virtual ~FakeContentLayerClient();
 
   virtual void PaintContents(SkCanvas* canvas,
-                             gfx::Rect rect,
+                             const gfx::Rect& rect,
                              gfx::RectF* opaque_rect) OVERRIDE;
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
 
   void set_paint_all_opaque(bool opaque) { paint_all_opaque_ = opaque; }
 
   void add_draw_rect(const gfx::RectF& rect, const SkPaint& paint) {
     draw_rects_.push_back(std::make_pair(rect, paint));
   }
 
   void add_draw_bitmap(const SkBitmap& bitmap,
@@ skipping 11 matching lines @@
   typedef std::vector<BitmapData> BitmapVector;
 
   bool paint_all_opaque_;
   RectPaintVector draw_rects_;
   BitmapVector draw_bitmaps_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_CONTENT_LAYER_CLIENT_H_