Improve caching of special case paths in GrStencilAndCoverPathRenderer

src/gpu/GrPath.h

Index: src/gpu/GrPath.h
diff --git a/src/gpu/GrPath.h b/src/gpu/GrPath.h
index a535e697caafefb9416dd9721d0617c9a1526d68..91975218c24c89bc7520ddff1773019428649b59 100644
--- a/src/gpu/GrPath.h
+++ b/src/gpu/GrPath.h
@@ -30,7 +30,8 @@ public:
     {
     }
 
-    static void ComputeKey(const SkPath& path, const GrStrokeInfo& stroke, GrUniqueKey* key);
+    static void ComputeKey(const SkPath& path, const GrStrokeInfo& stroke, GrUniqueKey* key,
+                           bool* outIsVolatile);
 
     const SkRect& getBounds() const { return fBounds; }