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

cc/output/filter_operation.cc

 // 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.
 
 #include <algorithm>
 
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/output/filter_operation.h"
 #include "third_party/skia/include/core/SkMath.h"
@@ skipping 22 matching lines @@
       drop_shadow_offset_(0, 0),
       drop_shadow_color_(0),
       zoom_inset_(0) {
   DCHECK_NE(type_, DROP_SHADOW);
   DCHECK_NE(type_, COLOR_MATRIX);
   DCHECK_NE(type_, REFERENCE);
   memset(matrix_, 0, sizeof(matrix_));
 }
 
 FilterOperation::FilterOperation(FilterType type,
-                                 gfx::Point offset,
+                                 const gfx::Point& offset,
                                  float stdDeviation,
                                  SkColor color)
     : type_(type),
       amount_(stdDeviation),
       drop_shadow_offset_(offset),
       drop_shadow_color_(color),
       zoom_inset_(0) {
   DCHECK_EQ(type_, DROP_SHADOW);
   memset(matrix_, 0, sizeof(matrix_));
 }
@@ skipping 206 matching lines @@
       value->SetBoolean("is_null", !image_filter_);
       value->SetInteger("count_inputs", count_inputs);
       value->SetBoolean("can_filter_image_gpu", can_filter_image_gpu);
       break;
     }
   }
   return value.PassAs<base::Value>();
 }
 
 }  // namespace cc