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..f9588674f0c73e7092740b00500fee6a64e13ba2 100644
--- a/public/platform/WebExternalTextureLayer.h
+++ b/public/platform/WebExternalTextureLayer.h
@@ -29,6 +29,7 @@
 #include "WebCommon.h"
 #include "WebFloatRect.h"
 #include "WebLayer.h"
+#include "third_party/skia/include/core/SkPaint.h"
 
 namespace blink {
 
@@ -62,6 +63,10 @@ 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 setFilterLevel(SkPaint::FilterLevel) = 0;
 };
 
 } // namespace blink