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 0fd05bb4228adce05f649337afca098248be0652..8466a306c53bf636ad5df6366d3d07678d00c500 100644
--- a/public/platform/WebExternalTextureLayer.h
+++ b/public/platform/WebExternalTextureLayer.h
@@ -62,6 +62,10 @@ 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;

[Justin Novosad, 2014/11/18 16:32:50]

I think this is no longer needed since you are now using mailbox.nearestNeighbor
to pass this parameter.

[jackhou1, 2014/12/01 07:00:08]

IIUC, having this should mean we don't need to reset the texture when
imageRendering changes. I've removed the m_imageBuffer->notifySurfaceInvalid();
in Canvas2DLayerBridge::setFilterLevel, so that this is actually the case.

 };
 
 } // namespace blink