Get correct GLVersion for Mesa to avoid GrContext creation failure

src/gpu/gl/GrGLUtil.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGLUtil_DEFINED
 #define GrGLUtil_DEFINED
 
@@ skipping 71 matching lines @@
 /**
  * Helpers for glGetError()
  */
 
 void GrGLCheckErr(const GrGLInterface* gl,
                   const char* location,
                   const char* call);
 
 void GrGLClearErr(const GrGLInterface* gl);
 
+int getMesaGLVersion(const int mesaMajorVersion, int* major, int* minor);
+
 ////////////////////////////////////////////////////////////////////////////////
 
 /**
  * Macros for using GrGLInterface to make GL calls
  */
 
 // internal macro to conditionally call glGetError based on compile-time and
 // run-time flags.
 #if GR_GL_CHECK_ERROR
     extern bool gCheckErrorGL;
@@ skipping 50 matching lines @@
     do {                                                        \
         GR_GL_CALLBACK_IMPL(IFACE);                             \
         (RET) = (IFACE)->f##X;                                  \
         GR_GL_LOG_CALLS_IMPL(X);                                \
     } while (false)
 
 // call glGetError without doing a redundant error check or logging.
 #define GR_GL_GET_ERROR(IFACE) (IFACE)->fGetError()
 
 #endif