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

webkit/renderer/compositor_bindings/web_content_layer_impl.cc

 // 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.
 
 #include "webkit/renderer/compositor_bindings/web_content_layer_impl.h"
 
 #include "cc/layers/content_layer.h"
 #include "cc/layers/picture_layer.h"
 #include "third_party/WebKit/public/platform/WebContentLayerClient.h"
 #include "third_party/WebKit/public/platform/WebFloatPoint.h"
@@ skipping 29 matching lines @@
 
 void WebContentLayerImpl::setDoubleSided(bool double_sided) {
   layer_->layer()->SetDoubleSided(double_sided);
 }
 
 void WebContentLayerImpl::setDrawCheckerboardForMissingTiles(bool enable) {
   layer_->layer()->SetDrawCheckerboardForMissingTiles(enable);
 }
 
 void WebContentLayerImpl::PaintContents(SkCanvas* canvas,
-                                        gfx::Rect clip,
+                                        const gfx::Rect& clip,
                                         gfx::RectF* opaque) {
   if (!client_)
     return;
 
   blink::WebFloatRect web_opaque;
   // For picture layers, always record with LCD text.  PictureLayerImpl
   // will turn this off later during rasterization.
   bool use_lcd_text = WebLayerImpl::UsingPictureLayer() || can_use_lcd_text_;
   client_->paintContents(canvas, clip, use_lcd_text, web_opaque);
   *opaque = web_opaque;
 }
 
 void WebContentLayerImpl::DidChangeLayerCanUseLCDText() {
   // It is important to make this comparison because the LCD text status
   // here can get out of sync with that in the layer.
   if (can_use_lcd_text_ == layer_->layer()->can_use_lcd_text())
     return;
 
   // LCD text cannot be enabled once disabled.
   if (layer_->layer()->can_use_lcd_text() && ignore_lcd_text_change_)
     return;
 
   can_use_lcd_text_ = layer_->layer()->can_use_lcd_text();
   ignore_lcd_text_change_ = true;
   layer_->invalidate();
 }
 
 }  // namespace webkit