[chromium] Pass SkBitmap by reference in WebImageLayer::setBitmap

cc/blink/web_image_layer_impl.cc

 // Copyright 2014 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/blink/web_image_layer_impl.h"
 
 #include "cc/blink/web_layer_impl.h"
 #include "cc/blink/web_layer_impl_fixed_bounds.h"
 #include "cc/layers/image_layer.h"
 #include "cc/layers/picture_image_layer.h"
 
 namespace cc_blink {
 
 WebImageLayerImpl::WebImageLayerImpl() {
   if (WebLayerImpl::UsingPictureLayer())
     layer_.reset(new WebLayerImplFixedBounds(cc::PictureImageLayer::Create()));
   else
     layer_.reset(new WebLayerImpl(cc::ImageLayer::Create()));
 }
 
 WebImageLayerImpl::~WebImageLayerImpl() {
 }
 
 blink::WebLayer* WebImageLayerImpl::layer() {
   return layer_.get();
 }
 
 void WebImageLayerImpl::setBitmap(SkBitmap bitmap) {
+  setImageBitmap(bitmap);
+}
+
+void WebImageLayerImpl::setImageBitmap(const SkBitmap& bitmap) {
   if (WebLayerImpl::UsingPictureLayer()) {
     static_cast<cc::PictureImageLayer*>(layer_->layer())->SetBitmap(bitmap);
     static_cast<WebLayerImplFixedBounds*>(layer_.get())
         ->SetFixedBounds(gfx::Size(bitmap.width(), bitmap.height()));
   } else {
     static_cast<cc::ImageLayer*>(layer_->layer())->SetBitmap(bitmap);
   }
 }
 
 }  // namespace cc_blink