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

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 79 matching lines @@
       CalcDrawPropsMainInputsForTesting;
   static void CalculateDrawProperties(CalcDrawPropsMainInputs* inputs);
 
   typedef CalcDrawPropsInputs<LayerImpl, LayerImplList> CalcDrawPropsImplInputs;
   typedef CalcDrawPropsInputsForTesting<LayerImpl, LayerImplList>
       CalcDrawPropsImplInputsForTesting;
   static void CalculateDrawProperties(CalcDrawPropsImplInputs* inputs);
 
   // Performs hit testing for a given render_surface_layer_list.
   static LayerImpl* FindLayerThatIsHitByPoint(
-      gfx::PointF screen_space_point,
+      const gfx::PointF& screen_space_point,
       const LayerImplList& render_surface_layer_list);
 
   static LayerImpl* FindLayerThatIsHitByPointInTouchHandlerRegion(
-      gfx::PointF screen_space_point,
+      const gfx::PointF& screen_space_point,
       const LayerImplList& render_surface_layer_list);
 
-  static bool LayerHasTouchEventHandlersAt(gfx::PointF screen_space_point,
-                                           LayerImpl* layer_impl);
+  static bool LayerHasTouchEventHandlersAt(
+      const gfx::PointF& screen_space_point,
+      LayerImpl* layer_impl);
 
   template <typename LayerType>
   static bool RenderSurfaceContributesToTarget(LayerType*,
                                                int target_surface_layer_id);
 
   template <typename LayerType>
   static void CallFunctionForSubtree(
       LayerType* root_layer,
       const base::Callback<void(LayerType* layer)>& function);
 
@@ skipping 130 matching lines @@
           true,
           false,
           render_surface_layer_list) {
   DCHECK(root_layer);
   DCHECK(render_surface_layer_list);
 }
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_COMMON_H_