[chromium] Pass SkBitmap by reference in WebNinePatchLayer::setBitmap and refactor

cc/blink/web_nine_patch_layer_impl.h

 // 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.
 
 #ifndef CC_BLINK_WEB_NINE_PATCH_LAYER_IMPL_H_
 #define CC_BLINK_WEB_NINE_PATCH_LAYER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/blink/cc_blink_export.h"
 #include "third_party/WebKit/public/platform/WebNinePatchLayer.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace cc_blink {
 
 class WebLayerImpl;
 
 class WebNinePatchLayerImpl : public blink::WebNinePatchLayer {
  public:
   CC_BLINK_EXPORT WebNinePatchLayerImpl();
   virtual ~WebNinePatchLayerImpl();
 
   // blink::WebNinePatchLayer implementation.
   virtual blink::WebLayer* layer();
 
-  // TODO(ccameron): Remove setBitmap(SkBitmap, blink::WebRect) in favor of
-  // setBitmap(), setAperture(), and setBorder();
+  // TODO(vivekg): Remove setBitmap(SkBitmap, blink::WebRect) once blink side
+  // CL, http://crrev.com/594193002 lands
   virtual void setBitmap(SkBitmap bitmap, const blink::WebRect& aperture);
-  virtual void setBitmap(SkBitmap bitmap);
+  virtual void setBitmap(const SkBitmap& bitmap);
   virtual void setAperture(const blink::WebRect& aperture);
   virtual void setBorder(const blink::WebRect& border);
-  virtual void setFillCenter(bool fill_center);
 
  private:
   scoped_ptr<WebLayerImpl> layer_;
 
   DISALLOW_COPY_AND_ASSIGN(WebNinePatchLayerImpl);
 };
 
 }  // namespace cc_blink
 
 #endif  // CC_BLINK_WEB_NINE_PATCH_LAYER_IMPL_H_