Implement support for CHROMIUM_NV_path_rendering pseudo extension

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 b5da4d3a95982a09c6348d999ca5d419a209b299..fe4e2d461227aa1108b4341fb3230de0929265b0 100644
--- a/src/gpu/gl/GrGLInterface.cpp
+++ b/src/gpu/gl/GrGLInterface.cpp
@@ -241,6 +241,27 @@ bool GrGLInterface::validate() const {
             NULL == fFunctions.fStencilOpSeparate) {
             RETURN_FALSE_INTERFACE
         }
+        if (fExtensions.has("GL_CHROMIUM_path_rendering")) {
+            if (NULL == fFunctions.fMatrixLoadf ||
+                NULL == fFunctions.fMatrixLoadIdentity ||
+                NULL == fFunctions.fPathCommands ||
+                NULL == fFunctions.fPathParameteri ||
+                NULL == fFunctions.fPathParameterf ||
+                NULL == fFunctions.fGenPaths ||
+                NULL == fFunctions.fDeletePaths ||
+                NULL == fFunctions.fPathStencilFunc ||
+                NULL == fFunctions.fStencilFillPath ||
+                NULL == fFunctions.fStencilFillPathInstanced ||
+                NULL == fFunctions.fStencilStrokePath ||
+                NULL == fFunctions.fStencilStrokePathInstanced ||
+                NULL == fFunctions.fPathTexGen ||
+                NULL == fFunctions.fCoverFillPath ||
+                NULL == fFunctions.fCoverFillPathInstanced ||
+                NULL == fFunctions.fCoverStrokePath ||
+                NULL == fFunctions.fCoverStrokePathInstanced) {
+                return false;
+            }
+        }
     } else if (kGL_GrGLStandard == fStandard) {
 
         if (glVer >= GR_GL_VER(2,0)) {