Re-enable child X window workaround.

ui/gl/gl_surface_glx.cc

 // Copyright (c) 2012 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/gl/gl_surface_glx.h"
 
@@ skipping 372 matching lines @@
   // it's own thread.
   XInitThreads();
 
 #if defined(TOOLKIT_GTK)
   // Be sure to use the X display handle and not the GTK display handle if this
   // is the GPU process.
   g_create_child_windows =
       base::MessageLoop::current() &&
       base::MessageLoop::current()->type() == base::MessageLoop::TYPE_GPU;
 
-  // Disable this path because it is causing window contents to disappear.
-  // http://crbug.com/292655
-  g_create_child_windows = false;
-
   if (g_create_child_windows)
     g_display = base::MessagePumpX11::GetDefaultXDisplay();
   else
     g_display = base::MessagePumpForUI::GetDefaultXDisplay();
 #else
   g_display = base::MessagePumpForUI::GetDefaultXDisplay();
 #endif
 
   if (!g_display) {
     LOG(ERROR) << "XOpenDisplay failed.";
@@ skipping 388 matching lines @@
 
 void* PbufferGLSurfaceGLX::GetConfig() {
   return config_;
 }
 
 PbufferGLSurfaceGLX::~PbufferGLSurfaceGLX() {
   Destroy();
 }
 
 }  // namespace gfx