Add special case circle blur for Ganesh

include/core/SkScalar.h

Index: include/core/SkScalar.h
diff --git a/include/core/SkScalar.h b/include/core/SkScalar.h
index 71575a4920211a215db4cf7ca0952cc76b9fad9c..4efa8417afd4a9edc903c19412a68ac3b997d7af 100644
--- a/include/core/SkScalar.h
+++ b/include/core/SkScalar.h
@@ -224,7 +224,7 @@ static inline bool SkScalarNearlyZero(SkScalar x,
 }
 
 static inline bool SkScalarNearlyEqual(SkScalar x, SkScalar y,
-                                     SkScalar tolerance = SK_ScalarNearlyZero) {
+                                       SkScalar tolerance = SK_ScalarNearlyZero) {
     SkASSERT(tolerance >= 0);
     return SkScalarAbs(x-y) <= tolerance;
 }