added support for PLS path rendering

src/gpu/GrPathProcessor.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrPathProcessor_DEFINED
 #define GrPathProcessor_DEFINED
 
@@ skipping 22 matching lines @@
 
     virtual void getGLSLProcessorKey(const GrGLSLCaps& caps,
                                      GrProcessorKeyBuilder* b) const override;
 
     virtual GrGLSLPrimitiveProcessor* createGLSLInstance(const GrGLSLCaps& caps) const override;
 
     bool hasTransformedLocalCoords() const override { return false; }
 
     const GrXPOverridesForBatch& overrides() const { return fOverrides; }
 
+    virtual bool isPathRendering() const override { return true; }
+
 private:
     GrPathProcessor(GrColor color, const GrXPOverridesForBatch& overrides,
                     const SkMatrix& viewMatrix, const SkMatrix& localMatrix);
 
     bool hasExplicitLocalCoords() const override { return false; }
 
     GrColor fColor;
     const SkMatrix fViewMatrix;
     const SkMatrix fLocalMatrix;
     GrXPOverridesForBatch fOverrides;
 
     typedef GrPrimitiveProcessor INHERITED;
 };
 
 #endif