[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

cc/layers/nine_patch_layer_impl.cc

 // Copyright 2012 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 "cc/layers/nine_patch_layer_impl.h"
 
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
 #include "cc/layers/quad_sink.h"
@@ skipping 26 matching lines @@
                                  float width,
                                  float height,
                                  float total_width,
                                  float total_height) {
   return gfx::RectF(x / total_width,
                     y / total_height,
                     width / total_width,
                     height / total_height);
 }
 
-void NinePatchLayerImpl::SetLayout(gfx::Rect aperture,
-                                   gfx::Rect border,
+void NinePatchLayerImpl::SetLayout(const gfx::Rect& aperture,
+                                   const gfx::Rect& border,
                                    bool fill_center) {
   // This check imposes an ordering on the call sequence.  An UIResource must
   // exist before SetLayout can be called.
   DCHECK(ui_resource_id_);
 
   if (image_aperture_ == aperture &&
       border_ == border && fill_center_ == fill_center)
     return;
 
   image_aperture_ = aperture;
@@ skipping 303 matching lines @@
   result->Set("Border", MathUtil::AsValue(border_).release());
 
   base::FundamentalValue* fill_center =
       base::Value::CreateBooleanValue(fill_center_);
   result->Set("FillCenter", fill_center);
 
   return result;
 }
 
 }  // namespace cc