[#8] Pass gfx::Point by const ref.

cc/output/filter_operation.h

 // Copyright 2013 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_OUTPUT_FILTER_OPERATION_H_
 #define CC_OUTPUT_FILTER_OPERATION_H_
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 95 matching lines @@
   }
 
   static FilterOperation CreateOpacityFilter(float amount) {
     return FilterOperation(OPACITY, amount);
   }
 
   static FilterOperation CreateBlurFilter(float amount) {
     return FilterOperation(BLUR, amount);
   }
 
-  static FilterOperation CreateDropShadowFilter(gfx::Point offset,
+  static FilterOperation CreateDropShadowFilter(const gfx::Point& offset,
                                                 float std_deviation,
                                                 SkColor color) {
     return FilterOperation(DROP_SHADOW, offset, std_deviation, color);
   }
 
   static FilterOperation CreateColorMatrixFilter(SkScalar matrix[20]) {
     return FilterOperation(COLOR_MATRIX, matrix);
   }
 
   static FilterOperation CreateZoomFilter(float amount, int inset) {
@@ skipping 21 matching lines @@
   }
 
   void set_type(FilterType type) { type_ = type; }
 
   void set_amount(float amount) {
     DCHECK_NE(type_, COLOR_MATRIX);
     DCHECK_NE(type_, REFERENCE);
     amount_ = amount;
   }
 
-  void set_drop_shadow_offset(gfx::Point offset) {
+  void set_drop_shadow_offset(const gfx::Point& offset) {
     DCHECK_EQ(type_, DROP_SHADOW);
     drop_shadow_offset_ = offset;
   }
 
   void set_drop_shadow_color(SkColor color) {
     DCHECK_EQ(type_, DROP_SHADOW);
     drop_shadow_color_ = color;
   }
 
   void set_image_filter(const skia::RefPtr<SkImageFilter>& image_filter) {
@@ skipping 21 matching lines @@
   static FilterOperation Blend(const FilterOperation* from,
                                const FilterOperation* to,
                                double progress);
 
   scoped_ptr<base::Value> AsValue() const;
 
  private:
   FilterOperation(FilterType type, float amount);
 
   FilterOperation(FilterType type,
-                  gfx::Point offset,
+                  const gfx::Point& offset,
                   float stdDeviation,
                   SkColor color);
 
   FilterOperation(FilterType, SkScalar matrix[20]);
 
   FilterOperation(FilterType type, float amount, int inset);
 
   FilterOperation(FilterType type,
                   const skia::RefPtr<SkImageFilter>& image_filter);
 
   FilterType type_;
   float amount_;
   gfx::Point drop_shadow_offset_;
   SkColor drop_shadow_color_;
   skia::RefPtr<SkImageFilter> image_filter_;
   SkScalar matrix_[20];
   int zoom_inset_;
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_FILTER_OPERATION_H_