[#4] Pass gfx structs by const ref (gfx::PointF)

cc/layers/ui_resource_layer.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 CC_LAYERS_UI_RESOURCE_LAYER_H_
 #define CC_LAYERS_UI_RESOURCE_LAYER_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/layers/layer.h"
@@ skipping 14 matching lines @@
   virtual void PushPropertiesTo(LayerImpl* layer) OVERRIDE;
 
   virtual void SetLayerTreeHost(LayerTreeHost* host) OVERRIDE;
 
   void SetBitmap(const SkBitmap& skbitmap);
 
   // An alternative way of setting the resource to allow for sharing.
   void SetUIResourceId(UIResourceId resource_id);
 
   // Sets a UV transform to be used at draw time. Defaults to (0, 0) and (1, 1).
-  void SetUV(gfx::PointF top_left, gfx::PointF bottom_right);
+  void SetUV(const gfx::PointF& top_left, const gfx::PointF& bottom_right);
 
   // Sets an opacity value per vertex. It will be multiplied by the layer
   // opacity value.
   void SetVertexOpacity(float bottom_left,
                         float top_left,
                         float top_right,
                         float bottom_right);
 
   class UIResourceHolder {
    public:
@@ skipping 18 matching lines @@
   void RecreateUIResourceHolder();
 
 
 
   DISALLOW_COPY_AND_ASSIGN(UIResourceLayer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_UI_RESOURCE_LAYER_H_