Pass gfx structs by const ref (gfx::PointF)

cc/layers/texture_layer_impl.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_LAYERS_TEXTURE_LAYER_IMPL_H_
 #define CC_LAYERS_TEXTURE_LAYER_IMPL_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 23 matching lines @@
   void ReleaseResources() override;
 
   // These setter methods don't cause any implicit damage, so the texture client
   // must explicitly invalidate if they intend to cause a visible change in the
   // layer's output.
   void SetTextureId(unsigned id);
   void SetPremultipliedAlpha(bool premultiplied_alpha);
   void SetBlendBackgroundColor(bool blend);
   void SetFlipped(bool flipped);
   void SetNearestNeighbor(bool nearest_neighbor);
-  void SetUVTopLeft(const gfx::PointF top_left);
-  void SetUVBottomRight(const gfx::PointF bottom_right);
+  void SetUVTopLeft(const gfx::PointF& top_left);
+  void SetUVBottomRight(const gfx::PointF& bottom_right);
 
   // 1--2
   // |  |
   // 0--3
   void SetVertexOpacity(const float vertex_opacity[4]);
 
   void SetTextureMailbox(
       const TextureMailbox& mailbox,
       scoped_ptr<SingleReleaseCallbackImpl> release_callback);
 
@@ skipping 18 matching lines @@
   scoped_ptr<SingleReleaseCallbackImpl> release_callback_;
   bool own_mailbox_;
   bool valid_texture_copy_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureLayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_TEXTURE_LAYER_IMPL_H_