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

cc/layers/layer_impl.h

 // Copyright 2011 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_LAYER_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 170 matching lines @@
   // Returns true if this layer has content to draw.
   void SetDrawsContent(bool draws_content);
   bool DrawsContent() const { return draws_content_; }
 
   void SetHideLayerAndSubtree(bool hide);
   bool hide_layer_and_subtree() const { return hide_layer_and_subtree_; }
 
   bool force_render_surface() const { return force_render_surface_; }
   void SetForceRenderSurface(bool force) { force_render_surface_ = force; }
 
-  void SetAnchorPoint(gfx::PointF anchor_point);
+  void SetAnchorPoint(const gfx::PointF& anchor_point);
   gfx::PointF anchor_point() const { return anchor_point_; }
 
   void SetAnchorPointZ(float anchor_point_z);
   float anchor_point_z() const { return anchor_point_z_; }
 
   void SetBackgroundColor(SkColor background_color);
   SkColor background_color() const { return background_color_; }
   // If contents_opaque(), return an opaque color else return a
   // non-opaque color.  Tries to return background_color(), if possible.
   SkColor SafeOpaqueBackgroundColor() const;
@@ skipping 23 matching lines @@
   SkXfermode::Mode blend_mode() const { return blend_mode_; }
   bool uses_default_blend_mode() const {
     return blend_mode_ == SkXfermode::kSrcOver_Mode;
   }
 
   void SetIsRootForIsolatedGroup(bool root);
   bool is_root_for_isolated_group() const {
     return is_root_for_isolated_group_;
   }
 
-  void SetPosition(gfx::PointF position);
+  void SetPosition(const gfx::PointF& position);
   gfx::PointF position() const { return position_; }
 
   void SetIsContainerForFixedPositionLayers(bool container) {
     is_container_for_fixed_position_layers_ = container;
   }
   // This is a non-trivial function in Layer.
   bool IsContainerForFixedPositionLayers() const {
     return is_container_for_fixed_position_layers_;
   }
 
@@ skipping 182 matching lines @@
   const Region& touch_event_handler_region() const {
     return touch_event_handler_region_;
   }
 
   void SetDrawCheckerboardForMissingTiles(bool checkerboard) {
     draw_checkerboard_for_missing_tiles_ = checkerboard;
   }
   bool DrawCheckerboardForMissingTiles() const;
 
   InputHandler::ScrollStatus TryScroll(
-      gfx::PointF screen_space_point,
+      const gfx::PointF& screen_space_point,
       InputHandler::ScrollInputType type) const;
 
   void SetDoubleSided(bool double_sided);
   bool double_sided() const { return double_sided_; }
 
   void SetTransform(const gfx::Transform& transform);
   const gfx::Transform& transform() const { return transform_; }
   bool TransformIsAnimating() const;
   bool TransformIsAnimatingOnImplOnly() const;
 
@@ skipping 205 matching lines @@
   DrawProperties<LayerImpl> draw_properties_;
 
   scoped_refptr<base::debug::ConvertableToTraceFormat> debug_info_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_