Implement image-rendering:pixelated for directly composited images.

Source/core/rendering/compositing/CompositedLayerMapping.cpp

 /*
  * Copyright (C) 2009, 2010, 2011 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 1846 matching lines @@
     if (!image)
         return;
 
     // We have to wait until the image is fully loaded before setting it on the layer.
     if (!cachedImage->isLoaded())
         return;
 
     // This is a no-op if the layer doesn't have an inner layer for the image.
     m_graphicsLayer->setContentsToImage(image);
 
+    m_graphicsLayer->setFilterLevel(renderer()->style()->imageRendering() == ImageRenderingPixelated ? SkPaint::kNone_FilterLevel : SkPaint::kLow_FilterLevel);
+
     // Prevent double-drawing: https://bugs.webkit.org/show_bug.cgi?id=58632
     updateDrawsContent();
 
     // Image animation is "lazy", in that it automatically stops unless someone is drawing
     // the image. So we have to kick the animation each time; this has the downside that the
     // image will keep animating, even if its layer is not visible.
     image->startAnimation();
 }
 
 FloatPoint3D CompositedLayerMapping::computeTransformOrigin(const IntRect& borderBox) const
@@ skipping 439 matching lines @@
     } else if (graphicsLayer == m_scrollingBlockSelectionLayer.get()) {
         name = "Scrolling Block Selection Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink