Incorporate glStencilThenCover* nvpr methods

src/gpu/gl/GrGLInterface.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #include "gl/GrGLInterface.h"
 #include "gl/GrGLExtensions.h"
@@ skipping 449 matching lines @@
             NULL == fFunctions.fDeletePaths ||
             NULL == fFunctions.fIsPath ||
             NULL == fFunctions.fPathStencilFunc ||
             NULL == fFunctions.fStencilFillPath ||
             NULL == fFunctions.fStencilStrokePath ||
             NULL == fFunctions.fStencilFillPathInstanced ||
             NULL == fFunctions.fStencilStrokePathInstanced ||
             NULL == fFunctions.fCoverFillPath ||
             NULL == fFunctions.fCoverStrokePath ||
             NULL == fFunctions.fCoverFillPathInstanced ||
-            NULL == fFunctions.fCoverStrokePathInstanced) {
+            NULL == fFunctions.fCoverStrokePathInstanced ||
+            NULL == fFunctions.fStencilThenCoverFillPath ||
+            NULL == fFunctions.fStencilThenCoverStrokePath ||
+            NULL == fFunctions.fStencilThenCoverFillPathInstanced ||
+            NULL == fFunctions.fStencilThenCoverStrokePathInstanced) {
             RETURN_FALSE_INTERFACE
         }
         // Currently ProgramPathFragmentInputGen is not used on
         // OpenGL, rather PathTexGen is.
         if ((kGL_GrGLStandard == fStandard && NULL == fFunctions.fPathTexGen) ||
             (kGLES_GrGLStandard == fStandard && NULL == fFunctions.fProgramPathFragmentInputGen)) {
             RETURN_FALSE_INTERFACE
         }
     }
 
     return true;
 }