[#7] Pass gfx structs by const ref (gfx::Size)

cc/trees/layer_tree_host_common.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_TREES_LAYER_TREE_HOST_COMMON_H_
 #define CC_TREES_LAYER_TREE_HOST_COMMON_H_
 
 #include <limits>
 #include <vector>
 
@@ skipping 14 matching lines @@
 class CC_EXPORT LayerTreeHostCommon {
  public:
   static gfx::Rect CalculateVisibleRect(const gfx::Rect& target_surface_rect,
                                         const gfx::Rect& layer_bound_rect,
                                         const gfx::Transform& transform);
 
   template <typename LayerType, typename RenderSurfaceLayerListType>
   struct CalcDrawPropsInputs {
    public:
     CalcDrawPropsInputs(LayerType* root_layer,
-                        gfx::Size device_viewport_size,
+                        const gfx::Size& device_viewport_size,
                         const gfx::Transform& device_transform,
                         float device_scale_factor,
                         float page_scale_factor,
                         const LayerType* page_scale_application_layer,
                         int max_texture_size,
                         bool can_use_lcd_text,
                         bool can_render_to_separate_surface,
                         bool can_adjust_raster_scales,
                         RenderSurfaceLayerListType* render_surface_layer_list)
         : root_layer(root_layer),
@@ skipping 19 matching lines @@
     bool can_render_to_separate_surface;
     bool can_adjust_raster_scales;
     RenderSurfaceLayerListType* render_surface_layer_list;
   };
 
   template <typename LayerType, typename RenderSurfaceLayerListType>
   struct CalcDrawPropsInputsForTesting
       : public CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType> {
     CalcDrawPropsInputsForTesting(
         LayerType* root_layer,
-        gfx::Size device_viewport_size,
+        const gfx::Size& device_viewport_size,
         const gfx::Transform& device_transform,
         RenderSurfaceLayerListType* render_surface_layer_list);
     CalcDrawPropsInputsForTesting(
         LayerType* root_layer,
-        gfx::Size device_viewport_size,
+        const gfx::Size& device_viewport_size,
         RenderSurfaceLayerListType* render_surface_layer_list);
 
    private:
     const gfx::Transform identity_transform_;
   };
 
   typedef CalcDrawPropsInputs<Layer, RenderSurfaceLayerList>
       CalcDrawPropsMainInputs;
   typedef CalcDrawPropsInputsForTesting<Layer, RenderSurfaceLayerList>
       CalcDrawPropsMainInputsForTesting;
@@ skipping 28 matching lines @@
 
   // Returns a layer with the given id if one exists in the subtree starting
   // from the given root layer (including mask and replica layers).
   template <typename LayerType>
   static LayerType* FindLayerInSubtree(LayerType* root_layer, int layer_id);
 
   // Applies the layer's sublayer transform about its anchor point to the
   // given transform.
   template <typename LayerType>
   static void ApplySublayerTransformAboutAnchor(const LayerType& layer,
-                                                gfx::Size bounds,
+                                                const gfx::Size& bounds,
                                                 gfx::Transform* transform) {
     if (!layer.sublayer_transform().IsIdentity()) {
       transform->Translate(layer.anchor_point().x() * bounds.width(),
                            layer.anchor_point().y() * bounds.height());
       transform->PreconcatTransform(layer.sublayer_transform());
       transform->Translate(-layer.anchor_point().x() * bounds.width(),
                            -layer.anchor_point().y() * bounds.height());
     }
   }
 
@@ skipping 80 matching lines @@
     CallFunctionForSubtree(get_child_as_raw_ptr(root_layer->children(), i),
                            function);
   }
 }
 
 template <typename LayerType, typename RenderSurfaceLayerListType>
 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
                                                    RenderSurfaceLayerListType>::
     CalcDrawPropsInputsForTesting(
         LayerType* root_layer,
-        gfx::Size device_viewport_size,
+        const gfx::Size& device_viewport_size,
         const gfx::Transform& device_transform,
         RenderSurfaceLayerListType* render_surface_layer_list)
     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
           root_layer,
           device_viewport_size,
           device_transform,
           1.f,
           1.f,
           NULL,
           std::numeric_limits<int>::max() / 2,
           false,
           true,
           false,
           render_surface_layer_list) {
   DCHECK(root_layer);
   DCHECK(render_surface_layer_list);
 }
 
 template <typename LayerType, typename RenderSurfaceLayerListType>
 LayerTreeHostCommon::CalcDrawPropsInputsForTesting<LayerType,
                                                    RenderSurfaceLayerListType>::
     CalcDrawPropsInputsForTesting(
         LayerType* root_layer,
-        gfx::Size device_viewport_size,
+        const gfx::Size& device_viewport_size,
         RenderSurfaceLayerListType* render_surface_layer_list)
     : CalcDrawPropsInputs<LayerType, RenderSurfaceLayerListType>(
           root_layer,
           device_viewport_size,
           identity_transform_,
           1.f,
           1.f,
           NULL,
           std::numeric_limits<int>::max() / 2,
           false,
           true,
           false,
           render_surface_layer_list) {
   DCHECK(root_layer);
   DCHECK(render_surface_layer_list);
 }
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_