[#3] Pass gfx structs by const ref (gfx::SizeF)

content/browser/android/in_process/synchronous_compositor_impl.h

 // Copyright 2013 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 CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_IMPL_H_
 #define CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_IMPL_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 60 matching lines @@
   virtual void UpdateFrameMetaData(
       const cc::CompositorFrameMetadata& frame_info) OVERRIDE;
   virtual void DidActivatePendingTree() OVERRIDE;
 
   // LayerScrollOffsetDelegate
   virtual void SetMaxScrollOffset(gfx::Vector2dF max_scroll_offset) OVERRIDE;
   virtual void SetTotalScrollOffset(gfx::Vector2dF new_value) OVERRIDE;
   virtual gfx::Vector2dF GetTotalScrollOffset() OVERRIDE;
   virtual bool IsExternalFlingActive() const OVERRIDE;
   virtual void SetTotalPageScaleFactor(float page_scale_factor) OVERRIDE;
-  virtual void SetScrollableSize(gfx::SizeF scrollable_size) OVERRIDE;
+  virtual void SetScrollableSize(const gfx::SizeF& scrollable_size) OVERRIDE;
 
   void SetInputHandler(cc::InputHandler* input_handler);
   void DidOverscroll(const cc::DidOverscrollParams& params);
 
  private:
   explicit SynchronousCompositorImpl(WebContents* contents);
   virtual ~SynchronousCompositorImpl();
   friend class WebContentsUserData<SynchronousCompositorImpl>;
 
   void DidCreateSynchronousOutputSurface(
       SynchronousCompositorOutputSurface* output_surface);
   bool CalledOnValidThread() const;
 
   SynchronousCompositorClient* compositor_client_;
   SynchronousCompositorOutputSurface* output_surface_;
   WebContents* contents_;
   cc::InputHandler* input_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(SynchronousCompositorImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_ANDROID_IN_PROCESS_SYNCHRONOUS_COMPOSITOR_IMPL_H_