Simple GPU based dithering

src/gpu/effects/GrDitherEffect.h

Index: src/gpu/effects/GrDitherEffect.h
diff --git a/src/gpu/effects/GrOvalEffect.h b/src/gpu/effects/GrDitherEffect.h
similarity index 52%
copy from src/gpu/effects/GrOvalEffect.h
copy to src/gpu/effects/GrDitherEffect.h
index 796ee5befb5790bd8fc586e24f8e5631ff8769df..63036c0c7f23beaa85c3715c7128673b00229fc7 100644
--- a/src/gpu/effects/GrOvalEffect.h
+++ b/src/gpu/effects/GrDitherEffect.h
@@ -5,20 +5,19 @@
  * found in the LICENSE file.
  */
 
-#ifndef GrOvalEffect_DEFINED
-#define GrOvalEffect_DEFINED
+#ifndef GrDitherEffect_DEFINED
+#define GrDitherEffect_DEFINED
 
 #include "GrTypes.h"
 #include "GrTypesPriv.h"
 
 class GrEffectRef;
-struct SkRect;
 
-namespace GrOvalEffect {
+namespace GrDitherEffect {
     /**
-     * Creates an effect that performs clipping against an oval.
+     * Creates an effect that dithers the resulting color to an RGBA8 framebuffer
      */
-    GrEffectRef* Create(GrEffectEdgeType, const SkRect&);
+    GrEffectRef* Create();
 };
 
 #endif