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

Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 934 matching lines @@
 
 void GraphicsLayer::setContentsToNinePatch(Image* image, const IntRect& aperture)
 {
     if (m_ninePatchLayer) {
         unregisterContentsLayer(m_ninePatchLayer->layer());
         m_ninePatchLayer.clear();
     }
     RefPtr<NativeImageSkia> nativeImage = image ? image->nativeImageForCurrentFrame() : nullptr;
     if (nativeImage) {
         m_ninePatchLayer = adoptPtr(Platform::current()->compositorSupport()->createNinePatchLayer());
-        m_ninePatchLayer->setBitmap(nativeImage->bitmap(), aperture);
+        const SkBitmap& bitmap = nativeImage->bitmap();
+        int borderWidth = bitmap.width() - aperture.width();
+        int borderHeight = bitmap.height() - aperture.height();
+        WebRect border(aperture.x(), aperture.y(), borderWidth, borderHeight);
+
+        m_ninePatchLayer->setBitmap(bitmap);
+        m_ninePatchLayer->setAperture(aperture);
+        m_ninePatchLayer->setBorder(border);
+
         m_ninePatchLayer->layer()->setOpaque(image->currentFrameKnownToBeOpaque());
         registerContentsLayer(m_ninePatchLayer->layer());
     }
     setContentsTo(m_ninePatchLayer ? m_ninePatchLayer->layer() : 0);
 }
 
 bool GraphicsLayer::addAnimation(PassOwnPtr<WebCompositorAnimation> popAnimation)
 {
     OwnPtr<WebCompositorAnimation> animation(popAnimation);
     ASSERT(animation);
@@ skipping 96 matching lines @@
 #ifndef NDEBUG
 void showGraphicsLayerTree(const blink::GraphicsLayer* layer)
 {
     if (!layer)
         return;
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif