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

public/platform/WebExternalTextureLayer.h

Index: public/platform/WebExternalTextureLayer.h
diff --git a/public/platform/WebExternalTextureLayer.h b/public/platform/WebExternalTextureLayer.h
index c8f94e5d50aafa3308bf0ee69a773dedf8052638..e666afd2f289b803c65f45da045bdba201fd8ae6 100644
--- a/public/platform/WebExternalTextureLayer.h
+++ b/public/platform/WebExternalTextureLayer.h
@@ -60,6 +60,10 @@ public:
     // Sets whether this context should be rate limited by the compositor. Rate limiting works by blocking
     // invalidate() and invalidateRect() calls if the compositor is too many frames behind.
     virtual void setRateLimitContext(bool) = 0;
+
+    // Sets whether this texture should use nearest neighbor interpolation as
+    // opposed to bilinear. Defaults to false.
+    virtual void setNearestNeighbor(bool) = 0;
 };
 
 } // namespace blink