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

Source/platform/graphics/Canvas2DLayerBridge.h

Index: Source/platform/graphics/Canvas2DLayerBridge.h
diff --git a/Source/platform/graphics/Canvas2DLayerBridge.h b/Source/platform/graphics/Canvas2DLayerBridge.h
index 3b93e43218888a143ab399bf878e258fa15f5bc3..94f85be624222d600b86fc23d37945ba31da2cf3 100644
--- a/Source/platform/graphics/Canvas2DLayerBridge.h
+++ b/Source/platform/graphics/Canvas2DLayerBridge.h
@@ -74,6 +74,7 @@ public:
     WebLayer* layer() const;
     Platform3DObject getBackingTexture();
     bool isAccelerated() const { return true; }
+    void setNearestNeighbor(bool);
     void setIsHidden(bool);
     void setImageBuffer(ImageBuffer* imageBuffer) { m_imageBuffer = imageBuffer; }
 
@@ -110,6 +111,7 @@ protected:
     int m_framesSinceMailboxRelease;
     bool m_destructionInProgress;
     bool m_rateLimitingEnabled;
+    bool m_nearestNeighbor;
     bool m_isHidden;
 
     friend class WTF::DoublyLinkedListNode<Canvas2DLayerBridge>;