Refactor GrGpu path rendering functions to GrPathRendering

src/gpu/GrPathRange.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPathRange_DEFINED
 #define GrPathRange_DEFINED
 
@@ skipping 65 matching lines @@
     }
 #endif
 protected:
     // Initialize a path in the range before drawing. This is only called when
     // fPathGenerator is non-null. The child class need not call didChangeGpuMemorySize(),
     // GrPathRange will take care of that after the call is complete.
     virtual void onInitPath(int index, const SkPath&) const = 0;
 
 private:
     // Notify when paths will be drawn in case this is a lazy-loaded path range.
-    friend class GrGpu;
+    friend class GrPathRendering;
     void willDrawPaths(const void* indices, PathIndexType, int count) const;
     template<typename IndexType> void willDrawPaths(const void* indices, int count) const;
 
     mutable SkAutoTUnref<PathGenerator> fPathGenerator;
     mutable SkTArray<uint8_t, true /*MEM_COPY*/> fGeneratedPaths;
     const int fNumPaths;
 
     typedef GrGpuResource INHERITED;
 };
 
 #endif