Add stroking support to distance field path renderer

src/gpu/batches/GrAADistanceFieldPathRenderer.h

Index: src/gpu/batches/GrAADistanceFieldPathRenderer.h
diff --git a/src/gpu/batches/GrAADistanceFieldPathRenderer.h b/src/gpu/batches/GrAADistanceFieldPathRenderer.h
index 469aeeb981241bce1dd4a34e7440f5ef59d17988..c0e68268dedfe0def5ad98f7daedf3385d95f263 100755
--- a/src/gpu/batches/GrAADistanceFieldPathRenderer.h
+++ b/src/gpu/batches/GrAADistanceFieldPathRenderer.h
@@ -33,13 +33,30 @@ private:
     bool onDrawPath(const DrawPathArgs&) override;
 
     struct PathData {
-        struct Key {
+        class Key {
+        public:
+            // default ctor needed for new of uninitialized PathData
+            // since fStroke has no default ctor
+            Key() 
+                : fGenID(0)
+                , fDimension(0)
+                , fStroke(SkStrokeRec::kFill_InitStyle) {}
+            Key(uint32_t genID, uint32_t dim, const SkStrokeRec& stroke)
+                : fGenID(genID)
+                , fDimension(dim)
+                , fStroke(stroke) {}
+           
+            bool operator==(const Key& other) const {
+                return other.fGenID == fGenID && other.fDimension == fDimension &&
+                       fStroke.hasEqualEffect(other.fStroke);
+            }
+           
+        private:
             uint32_t   fGenID;
             // rendered size for stored path (32x32 max, 64x64 max, 128x128 max)
             uint32_t   fDimension;
-            bool operator==(const Key& other) const {
-                return other.fGenID == fGenID && other.fDimension == fDimension;
-            }
+            // stroking information
+            SkStrokeRec fStroke;
         };
         Key                   fKey;
         SkScalar              fScale;