Fix quickReject computation for blurs

include/core/SkMaskFilter.h

Index: include/core/SkMaskFilter.h
===================================================================
--- include/core/SkMaskFilter.h	(revision 9604)
+++ include/core/SkMaskFilter.h	(working copy)
@@ -70,6 +70,14 @@
         SkScalar fRadius;
         bool     fIgnoreTransform;
         bool     fHighQuality;
+
+        // The standard deviation of the blur's Gaussian distribution is some
+        // fraction of the specified radius (For CSS this is supposed to be .5
+        // but different browsers use different fractions). fSigmaFraction
+        // specifies this fraction.
+        SkScalar fSigmaFraction;
+        // Blur radii should be clamped to this limit
+        SkScalar fMaxRadius;
     };
 
     /**