Users stuck in fullscreen mode when running gnome-shell.

ui/base/x/x11_util.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.
 
 // This file defines utility functions for X11 (Linux only). This code has been
 // ported from XCB since we can't use XCB on Ubuntu while its 32-bit support
 // remains woefully incomplete.
 
 #include "ui/base/x/x11_util.h"
 
@@ skipping 449 matching lines @@
   gdk_window_get_user_data(gdk_window,
                            reinterpret_cast<gpointer*>(&gtk_window));
   if (!gtk_window)
     return NULL;
   return gtk_window;
 }
 
 void* GetVisualFromGtkWidget(GtkWidget* widget) {
   return GDK_VISUAL_XVISUAL(gtk_widget_get_visual(widget));
 }
+
+void SetHideTitlebarWhenMaximizedProperty(XID window) {
+  uint32 hide = 1;
+  XChangeProperty(GetXDisplay(),
+      window,
+      GetAtom("_GTK_HIDE_TITLEBAR_WHEN_MAXIMIZED"),
+      XA_CARDINAL,
+      32,  // size in bits
+      PropModeReplace,
+      reinterpret_cast<unsigned char*>(&hide),
+      1);
+}
 #endif  // defined(TOOLKIT_GTK)
 
 int BitsPerPixelForPixmapDepth(Display* dpy, int depth) {
   int count;
   XPixmapFormatValues* formats = XListPixmapFormats(dpy, &count);
   if (!formats)
     return -1;
 
   int bits_per_pixel = -1;
   for (int i = 0; i < count; ++i) {
@@ skipping 767 matching lines @@
       << "request_code " << static_cast<int>(error_event.request_code) << ", "
       << "minor_code " << static_cast<int>(error_event.minor_code)
       << " (" << request_str << ")";
 }
 
 // ----------------------------------------------------------------------------
 // End of x11_util_internal.h
 
 
 }  // namespace ui