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

cc/output/gl_renderer.h

 // Copyright 2010 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_OUTPUT_GL_RENDERER_H_
 #define CC_OUTPUT_GL_RENDERER_H_
 
 #include "base/cancelable_callback.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/scoped_ptr_vector.h"
@@ skipping 190 matching lines @@
       AsyncGetFramebufferPixelsCleanupCallback;
   void DoGetFramebufferPixels(
       uint8* pixels,
       const gfx::Rect& window_rect,
       const AsyncGetFramebufferPixelsCleanupCallback& cleanup_callback);
   void FinishedReadback(
       const AsyncGetFramebufferPixelsCleanupCallback& cleanup_callback,
       unsigned source_buffer,
       unsigned query,
       uint8_t* dest_pixels,
-      gfx::Size size);
+      const gfx::Size& size);
   void PassOnSkBitmap(scoped_ptr<SkBitmap> bitmap,
                       scoped_ptr<SkAutoLockPixels> lock,
                       scoped_ptr<CopyOutputRequest> request,
                       bool success);
 
   void ReinitializeGLState();
 
   virtual void DiscardBackbuffer() OVERRIDE;
   virtual void EnsureBackbuffer() OVERRIDE;
   void EnforceMemoryPolicy();
@@ skipping 218 matching lines @@
 #if DEBUG_GL_CALLS && !defined(NDEBUG)
 #define GLC(context, x)                                                        \
   (x, GLRenderer::DebugGLCall(&* context, #x, __FILE__, __LINE__))
 #else
 #define GLC(context, x) (x)
 #endif
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_GL_RENDERER_H_