Fail to create GrContext when we get a NULL for a GL/GLSL version string

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 209 matching lines @@
         NULL == fFunctions.fFramebufferTexture2D ||
         NULL == fFunctions.fGetFramebufferAttachmentParameteriv ||
         NULL == fFunctions.fGetRenderbufferParameteriv ||
         NULL == fFunctions.fGenFramebuffers ||
         NULL == fFunctions.fGenRenderbuffers ||
         NULL == fFunctions.fRenderbufferStorage) {
         RETURN_FALSE_INTERFACE
     }
 
     GrGLVersion glVer = GrGLGetVersion(this);
+    if (GR_GL_INVALID_VER == glVer) {
+        RETURN_FALSE_INTERFACE
+    }
 
     // Now check that baseline ES/Desktop fns not covered above are present
     // and that we have fn pointers for any advertised fExtensions that we will
     // try to use.
 
     // these functions are part of ES2, we assume they are available
     // On the desktop we assume they are available if the extension
     // is present or GL version is high enough.
     if (kGLES_GrGLStandard == fStandard) {
         if (NULL == fFunctions.fStencilFuncSeparate ||
@@ skipping 260 matching lines @@
             NULL == fFunctions.fMapTexSubImage2D ||
             NULL == fFunctions.fUnmapBufferSubData ||
             NULL == fFunctions.fUnmapTexSubImage2D) {
             RETURN_FALSE_INTERFACE;
         }
     }
 #endif
 
     return true;
 }