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

client/deps/glbench/src/egl_stuff.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 <EGL/egl.h>
 
 #include "main.h"
 #include "xlib_window.h"
 
 
@@ skipping 68 matching lines @@
 }
 
 void TerminateGL() {
   eglDestroySurface(egl_display, egl_surface);
   eglTerminate(egl_display);
 }
 
 void SwapBuffers() {
   eglSwapBuffers(egl_display, egl_surface);
 }
+
+bool SwapInterval(int interval) {
+  return eglSwapInterval(interval) == EGL_TRUE;
+}