Teartest with -o flag to specify override redirect window and -r number to specify refresh rate.

client/deps/glbench/src/xlib_window.cc

 // Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "main.h"
 #include "xlib_window.h"
 
 
 Display *xlib_display = NULL;
 Window xlib_window = 0;
 
 GLint g_width = 512;
 GLint g_height = 512;
+bool g_override_redirect = true;
 
 
 bool XlibInit() {
   xlib_display = ::XOpenDisplay(0);
   if (!xlib_display)
     return false;
 
   int screen = DefaultScreen(xlib_display);
   Window root_window = RootWindow(xlib_display, screen);
 
@@ skipping 15 matching lines @@
   };
   XVisualInfo *visinfo = glXChooseVisual(xlib_display, screen, attrib);
   unsigned long mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask |
     CWOverrideRedirect;
   XSetWindowAttributes attr;
   attr.background_pixel = 0;
   attr.border_pixel = 0;
   attr.colormap = XCreateColormap(xlib_display, root_window, visinfo->visual,
                                   AllocNone);
   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
-  attr.override_redirect = True;
+  attr.override_redirect = g_override_redirect ? True : False;
   xlib_window = ::XCreateWindow(xlib_display, root_window,
                                 0, 0, g_width, g_height, 0, visinfo->depth,
                                 InputOutput, visinfo->visual, mask, &attr);
 
   ::XMapWindow(xlib_display, xlib_window);
   ::XSync(xlib_display, True);
 
   ::XGetWindowAttributes(xlib_display, xlib_window, &attributes);
   g_width = attributes.width;
   g_height = attributes.height;
 
   return true;
 }