Obtain conic weights for GrPath cache keys from SkPathRef

include/core/SkPath.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPath_DEFINED
 #define SkPath_DEFINED
 
@@ skipping 1063 matching lines @@
         SkPathRef::Editor ed(&fPathRef);
 
         ed.setBounds(rect);
     }
 
     void setPt(int index, SkScalar x, SkScalar y);
 
     friend class SkAutoPathBoundsUpdate;
     friend class SkAutoDisableOvalCheck;
     friend class SkAutoDisableDirectionCheck;
+    friend class GrPath; // For fPathRef conic weights.
     friend class SkBench_AddPathTest; // perf test reversePathTo
     friend class PathTest_Private; // unit test reversePathTo
     friend class ForceIsRRect_Private; // unit test isRRect
 };
 
 #endif