Implement path cover with nv_path_rendering

src/gpu/GrClipMaskManager.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrClipMaskManager_DEFINED
 #define GrClipMaskManager_DEFINED
 
@@ skipping 52 matching lines @@
         if (kStencil_ClipMaskType == fCurrClipMaskType) {
             fCurrClipMaskType = kNone_ClipMaskType;
         }
     }
 
     GrContext* getContext() {
         return fAACache.getContext();
     }
 
     void setGpu(GrGpu* gpu);
+
+    void adjustPathStencilParams(GrStencilSettings* settings);
 private:
     /**
      * Informs the helper function adjustStencilParams() about how the stencil
      * buffer clip is being used.
      */
     enum StencilClipMode {
         // Draw to the clip bit of the stencil buffer
         kModifyClip_StencilClipMode,
         // Clip against the existing representation of the clip in the high bit
         // of the stencil buffer.
@@ skipping 76 matching lines @@
      * clipping.
      */
     void adjustStencilParams(GrStencilSettings* settings,
                              StencilClipMode mode,
                              int stencilBitCnt);
 
     typedef SkNoncopyable INHERITED;
 };
 
 #endif // GrClipMaskManager_DEFINED