Wrap NV_path_rendering API with GrGLPathRendering

src/gpu/gl/GrGpuGL.h

Index: src/gpu/gl/GrGpuGL.h
diff --git a/src/gpu/gl/GrGpuGL.h b/src/gpu/gl/GrGpuGL.h
index e67197219d8c389b26c128342c6fb2f639777f86..c8ee7dd06af0cf93147dbef61a2619be88034133 100644
--- a/src/gpu/gl/GrGpuGL.h
+++ b/src/gpu/gl/GrGpuGL.h
@@ -179,6 +179,22 @@ private:
     // binds texture unit in GL
     void setTextureUnit(int unitIdx);
 
+    // Stencil and cover GL paths, using the v1.3 API if available
+    void stencilThenCoverFillPath(GrGLuint path, GrGLenum fillMode,
+                                  GrGLuint mask, GrGLenum coverMode);
+    void stencilThenCoverStrokePath(GrGLuint path, GrGLint reference,
+                                    GrGLuint mask, GrGLenum coverMode);
+    void stencilThenCoverFillPathInstanced(GrGLsizei numPaths, GrGLenum pathNameType,
+                                           const GrGLvoid *paths, GrGLuint pathBase,
+                                           GrGLenum fillMode, GrGLuint mask,
+                                           GrGLenum coverMode, GrGLenum transformType,
+                                           const GrGLfloat *transformValues);
+    void stencilThenCoverStrokePathInstanced(GrGLsizei numPaths, GrGLenum pathNameType,
+                                             const GrGLvoid *paths, GrGLuint pathBase,
+                                             GrGLint reference, GrGLuint mask,
+                                             GrGLenum coverMode, GrGLenum transformType,
+                                             const GrGLfloat *transformValues);
+
     // Sets up vertex attribute pointers and strides. On return indexOffsetInBytes gives the offset
     // an into the index buffer. It does not account for drawInfo.startIndex() but rather the start
     // index is relative to the returned offset.