Fix ANGLE build wrong glGetString being called issue

src/gpu/gl/win/GrGLCreateNativeInterface_win.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/GrGLAssembleInterface.h"
@@ skipping 64 matching lines @@
 const GrGLInterface* GrGLCreateNativeInterface() {
     if (NULL == wglGetCurrentContext()) {
         return NULL;
     }
 
     GLProcGetter getter;
     if (!getter.isInitialized()) {
         return NULL;
     }
 
-    const char* verStr = reinterpret_cast<const char*>(glGetString(GR_GL_VERSION));
+    GrGLGetStringProc getString = (GrGLGetStringProc)getter.getProc("glGetString");
+    if (NULL == getString) {
+        return NULL;
+    }
+    const char* verStr = reinterpret_cast<const char*>(getString(GR_GL_VERSION));
     GrGLStandard standard = GrGLGetStandardInUseFromString(verStr);
 
     if (kGLES_GrGLStandard == standard) {
         return GrGLAssembleGLESInterface(&getter, win_get_gl_proc);
     } else if (kGL_GrGLStandard == standard) {
         return GrGLAssembleGLInterface(&getter, win_get_gl_proc);
     }
     return NULL;
 }