Wrap NV_path_rendering API with GrGLPathRendering

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 e9ba32ed2484276ef23e01ee20225458d24dbacb..c192611f5099a26109bf8a82c6e52e4043cea848 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -56,6 +56,10 @@ const GrGLInterface* GrGLInterfaceRemoveNVPR(const GrGLInterface* interface) {
     newInterface->fFunctions.fCoverStrokePath = NULL;
     newInterface->fFunctions.fCoverFillPathInstanced = NULL;
     newInterface->fFunctions.fCoverStrokePathInstanced = NULL;
+    newInterface->fFunctions.fStencilThenCoverFillPath = NULL;
+    newInterface->fFunctions.fStencilThenCoverStrokePath = NULL;
+    newInterface->fFunctions.fStencilThenCoverFillPathInstanced = NULL;
+    newInterface->fFunctions.fStencilThenCoverStrokePathInstanced = NULL;
     newInterface->fFunctions.fProgramPathFragmentInputGen = NULL;
     return newInterface;
 }
@@ -467,18 +471,23 @@ bool GrGLInterface::validate() const {
             NULL == fFunctions.fCoverFillPath ||
             NULL == fFunctions.fCoverStrokePath ||
             NULL == fFunctions.fCoverFillPathInstanced ||
-            NULL == fFunctions.fCoverStrokePathInstanced ||
-            NULL == fFunctions.fStencilThenCoverFillPath ||
-            NULL == fFunctions.fStencilThenCoverStrokePath ||
-            NULL == fFunctions.fStencilThenCoverFillPathInstanced ||
-            NULL == fFunctions.fStencilThenCoverStrokePathInstanced) {
+            NULL == fFunctions.fCoverStrokePathInstanced) {
             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
+        if (kGL_GrGLStandard == fStandard) {
+            // Some methods only exist on desktop
+            if (NULL == fFunctions.fPathTexGen) {
+                RETURN_FALSE_INTERFACE
+            }
+        } else {
+            // All additions through v1.3 exist on GLES
+            if (NULL == fFunctions.fStencilThenCoverFillPath ||
+                NULL == fFunctions.fStencilThenCoverStrokePath ||
+                NULL == fFunctions.fStencilThenCoverFillPathInstanced ||
+                NULL == fFunctions.fStencilThenCoverStrokePathInstanced ||
+                NULL == fFunctions.fProgramPathFragmentInputGen) {
+                RETURN_FALSE_INTERFACE
+            }
         }
     }