Make sure path computed from stroke-rec application using GrStyle is volatile.

src/gpu/GrStyle.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrStyle.h"
 #include "SkDashPathPriv.h"
 
@@ skipping 160 matching lines @@
     const SkPath* pathForStrokeRec = &src;
     if (this->applyPathEffect(dst, &strokeRec, src)) {
         pathForStrokeRec = dst;
     } else if (fPathEffect) {
         return false;
     }
     if (strokeRec.needToApply()) {
         if (!strokeRec.applyToPath(dst, *pathForStrokeRec)) {
             return false;
         }
+        dst->setIsVolatile(true);
         *style = SkStrokeRec::kFill_InitStyle;
     } else if (!fPathEffect) {
         // Nothing to do for path effect or stroke, fail.
         return false;
     } else {
         SkASSERT(SkStrokeRec::kFill_Style == strokeRec.getStyle() ||
                  SkStrokeRec::kHairline_Style == strokeRec.getStyle());
         *style = strokeRec.getStyle() == SkStrokeRec::kFill_Style
                  ? SkStrokeRec::kFill_InitStyle
                  : SkStrokeRec::kHairline_InitStyle;
     }
     return true;
 }