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

cc/layers/texture_layer.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_LAYERS_TEXTURE_LAYER_H_
 #define CC_LAYERS_TEXTURE_LAYER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 81 matching lines @@
   void ClearClient();
 
   virtual scoped_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl)
       OVERRIDE;
 
   // Sets whether this texture should be Y-flipped at draw time. Defaults to
   // true.
   void SetFlipped(bool flipped);
 
   // 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);
 
   // Sets whether the alpha channel is premultiplied or unpremultiplied.
   // Defaults to true.
@@ skipping 53 matching lines @@
 
   unsigned texture_id_;
   scoped_ptr<MailboxHolder::MainThreadReference> holder_ref_;
   bool needs_set_mailbox_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayer);
 };
 
 }  // namespace cc
 #endif  // CC_LAYERS_TEXTURE_LAYER_H_