plumbing for GPU fast blur

src/effects/SkBlurMaskFilter.cpp

Index: src/effects/SkBlurMaskFilter.cpp
diff --git a/src/effects/SkBlurMaskFilter.cpp b/src/effects/SkBlurMaskFilter.cpp
index 54d4a1b91ce8d980c29118300a68222aeef3611f..c51f49b0be0f3d00f2e0364eaa9405d07a9bf19e 100644
--- a/src/effects/SkBlurMaskFilter.cpp
+++ b/src/effects/SkBlurMaskFilter.cpp
@@ -45,6 +45,10 @@ public:
                                      GrPaint* grp,
                                      const SkStrokeRec& strokeRec,
                                      const SkPath& path) const SK_OVERRIDE;
+    virtual bool directFilterRRectMaskGPU(GrContext* context,
+                                          GrPaint* grp,
+                                          const SkStrokeRec& strokeRec,
+                                          const SkRRect& rrect) const SK_OVERRIDE;
 
     virtual bool filterMaskGPU(GrTexture* src,
                                const SkMatrix& ctm,
@@ -819,6 +823,13 @@ bool SkBlurMaskFilterImpl::directFilterMaskGPU(GrContext* context,
     return true;
 }
 
+bool SkBlurMaskFilterImpl::directFilterRRectMaskGPU(GrContext* context,
+                                                    GrPaint* grp,
+                                                    const SkStrokeRec& strokeRec,
+                                                    const SkRRect& rrect) const {
+    return false;
+}
+
 bool SkBlurMaskFilterImpl::canFilterMaskGPU(const SkRect& srcBounds,
                                             const SkIRect& clipBounds,
                                             const SkMatrix& ctm,