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

src/gpu/gl/GrGLContext.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLContext.h"
 
 ////////////////////////////////////////////////////////////////////////////////
@@ skipping 19 matching lines @@
         GR_GL_CALL_RET(interface, verUByte, GetString(GR_GL_VERSION));
         const char* ver = reinterpret_cast<const char*>(verUByte);
 
         const GrGLubyte* rendererUByte;
         GR_GL_CALL_RET(interface, rendererUByte, GetString(GR_GL_RENDERER));
         const char* renderer = reinterpret_cast<const char*>(rendererUByte);
 
         if (interface->validate()) {
 
             fGLVersion = GrGLGetVersionFromString(ver);
+            if (GR_GL_INVALID_VER == fGLVersion) {
+                return false;
+            }
 
-            fGLSLGeneration = GrGetGLSLGeneration(interface);
+            if (!GrGetGLSLGeneration(interface, &fGLSLGeneration)) {
+                return false;
+            }
 
             fVendor = GrGLGetVendor(interface);
 
             fRenderer = GrGLGetRendererFromString(renderer);
 
             fIsMesa = GrGLIsMesaFromVersionString(ver);
 
             fIsChromium = GrGLIsChromiumFromRendererString(renderer);
 
             // This must occur before caps init.
             fInterface.reset(SkRef(interface));
 
-            fGLCaps->init(*this, interface);
-
-            return true;
+            return fGLCaps->init(*this, interface);
         }
     }
     return false;
 }
 
 bool GrGLContextInfo::isInitialized() const {
     return NULL != fInterface.get();
 }
 
 void GrGLContextInfo::reset() {
     fInterface.reset(NULL);
     fGLVersion = GR_GL_VER(0, 0);
     fGLSLGeneration = static_cast<GrGLSLGeneration>(0);
     fVendor = kOther_GrGLVendor;
     fRenderer = kOther_GrGLRenderer;
     fIsMesa = false;
     fIsChromium = false;
     fGLCaps->reset();
 }