Create blurred RRect mask on GPU (rather than uploading it)

include/core/SkMaskFilter.h

Index: include/core/SkMaskFilter.h
diff --git a/include/core/SkMaskFilter.h b/include/core/SkMaskFilter.h
index 908226c8adf2444d99c6a54b7b2783acdb804bbc..e30fc62548b887c12f20ad9424c4e8c01c1fa162 100644
--- a/include/core/SkMaskFilter.h
+++ b/include/core/SkMaskFilter.h
@@ -17,6 +17,7 @@
 #include "SkStrokeRec.h"
 
 class GrClip;
+class GrContext;
 class GrDrawContext;
 class GrPaint;
 class GrRenderTarget;
@@ -122,7 +123,7 @@ public:
      *  Try to directly render a rounded rect mask filter into the target.  Returns
      *  true if drawing was successful.
      */
-    virtual bool directFilterRRectMaskGPU(GrTextureProvider* texProvider,
+    virtual bool directFilterRRectMaskGPU(GrContext*,
                                           GrDrawContext* drawContext,
                                           GrPaint* grp,
                                           const GrClip&,