Workaround for open source drivers.

ui/gfx/gl/gl_surface_glx.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 extern "C" {
 #include <X11/Xlib.h>
 }
 
 #include "ui/gfx/gl/gl_surface_glx.h"
 
@@ skipping 89 matching lines @@
                      &visual_template,
                      &num_visual_infos));
 
   if (!num_visual_infos)
     return false;
 
   if (glXGetFBConfigFromVisualSGIX) {
     config_ = glXGetFBConfigFromVisualSGIX(g_display, visual_infos.get());
     if (!config_) {
       LOG(ERROR) << "glXGetFBConfigFromVisualSGIX failed.";
-      return false;
     }
-  } else {
+  }
+
+  if (!config_) {
     int config_id;
     if (glXGetConfig(g_display,
                      visual_infos.get(),
                      GLX_FBCONFIG_ID,
                      &config_id)) {
       LOG(ERROR) << "glXGetConfig failed.";
       return false;
     }
 
     const int config_attributes[] = {
@@ skipping 148 matching lines @@
 
 void* PbufferGLSurfaceGLX::GetHandle() {
   return reinterpret_cast<void*>(pbuffer_);
 }
 
 void* PbufferGLSurfaceGLX::GetConfig() {
   return config_;
 }
 
 }  // namespace gfx