Implement image-rendering:pixelated for accelerated 2D canvases.

Source/platform/graphics/Canvas2DImageBufferSurface.h

Index: Source/platform/graphics/Canvas2DImageBufferSurface.h
diff --git a/Source/platform/graphics/Canvas2DImageBufferSurface.h b/Source/platform/graphics/Canvas2DImageBufferSurface.h
index fc18234b3b5b93a3aedf20c82fd91d9a06c490cf..9105125971069cec2f505384d4fb264ae190757e 100644
--- a/Source/platform/graphics/Canvas2DImageBufferSurface.h
+++ b/Source/platform/graphics/Canvas2DImageBufferSurface.h
@@ -61,6 +61,7 @@ public:
     virtual WebLayer* layer() const OVERRIDE { return m_layerBridge->layer(); }
     virtual Platform3DObject getBackingTexture() const OVERRIDE { return m_layerBridge->getBackingTexture(); }
     virtual bool isAccelerated() const OVERRIDE { return m_layerBridge->isAccelerated(); }
+    virtual void setNearestNeighbor(bool nearestNeighbor) OVERRIDE { m_layerBridge->setNearestNeighbor(nearestNeighbor); };
     virtual void setIsHidden(bool hidden) OVERRIDE { m_layerBridge->setIsHidden(hidden); }
     virtual void setImageBuffer(ImageBuffer* imageBuffer) OVERRIDE { m_layerBridge->setImageBuffer(imageBuffer); }