Add support for glMemoryGlyphIndexArrayNV

src/gpu/gl/GrGLInterface.cpp

Index: src/gpu/gl/GrGLInterface.cpp
diff --git a/src/gpu/gl/GrGLInterface.cpp b/src/gpu/gl/GrGLInterface.cpp
index 4c2713d33493c12e39aebaac270951d014b7575b..063de56aeb5cae826775736fbdf80b50c30545b7 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -61,6 +61,7 @@ const GrGLInterface* GrGLInterfaceRemoveNVPR(const GrGLInterface* interface) {
     newInterface->fFunctions.fStencilThenCoverFillPathInstanced = NULL;
     newInterface->fFunctions.fStencilThenCoverStrokePathInstanced = NULL;
     newInterface->fFunctions.fProgramPathFragmentInputGen = NULL;
+    newInterface->fFunctions.fPathMemoryGlyphIndexArray = NULL;
     return newInterface;
 }
 
@@ -485,7 +486,8 @@ bool GrGLInterface::validate() const {
                 NULL == fFunctions.fStencilThenCoverStrokePath ||
                 NULL == fFunctions.fStencilThenCoverFillPathInstanced ||
                 NULL == fFunctions.fStencilThenCoverStrokePathInstanced ||
-                NULL == fFunctions.fProgramPathFragmentInputGen) {
+                NULL == fFunctions.fProgramPathFragmentInputGen ||
+                NULL == fFunctions.fPathMemoryGlyphIndexArray) {
                 RETURN_FALSE_INTERFACE
             }
         }