Batch multiple single NVPR draw paths to instanced draws

src/gpu/gl/GrGLPath.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 GrGLPath_DEFINED
 #define GrGLPath_DEFINED
 
@@ skipping 19 matching lines @@
     static void InitPathObjectStroke(GrGLGpu* gpu, GrGLuint pathID, const GrStrokeInfo& stroke);
 
     static void InitPathObjectEmptyPath(GrGLGpu*, GrGLuint pathID);
 
 
     GrGLPath(GrGLGpu* gpu, const SkPath& path, const GrStrokeInfo& stroke);
     GrGLuint pathID() const { return fPathID; }
 
     bool shouldStroke() const { return fShouldStroke; }
     bool shouldFill() const { return fShouldFill; }
+    bool canCombineDrawPathBatchWith(const GrPath& other) const override;
 protected:
     void onRelease() override;
     void onAbandon() override;
 
 private:
     // TODO: Figure out how to get an approximate size of the path in Gpu memory.
     size_t onGpuMemorySize() const override { return 100; }
 
     GrGLuint fPathID;
     bool fShouldStroke;
     bool fShouldFill;
 
     typedef GrPath INHERITED;
 };
 
 #endif