fix for glXGetProcAddress of egl functions in glx context

src/gpu/gl/glx/GrGLCreateNativeInterface_glx.cpp

 /*
  * Copyright 2014 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"
 #include "gl/GrGLUtil.h"
-
+#include <string>
 #include <GL/glx.h>
 
 static GrGLFuncPtr glx_get(void* ctx, const char name[]) {
     SkASSERT(nullptr == ctx);
     SkASSERT(glXGetCurrentContext());
+    const char *strP = strstr(name, "egl");
+    if(strP && strP == name) { //return 0 for egl functions in glx context
+        return nullptr;
+    }
     return glXGetProcAddress(reinterpret_cast<const GLubyte*>(name));
 }
 
 const GrGLInterface* GrGLCreateNativeInterface() {
     if (nullptr == glXGetCurrentContext()) {
         return nullptr;
     }
 
     return GrGLAssembleInterface(nullptr, glx_get);
 }