Users stuck in fullscreen mode when running gnome-shell.

ui/base/x/x11_util.cc

Index: ui/base/x/x11_util.cc
diff --git a/ui/base/x/x11_util.cc b/ui/base/x/x11_util.cc
index a7b1bc3ad03f90df43e283ef900142c6d04f0512..06c97c046b261606ef4b321ebb176138650664bb 100644
--- a/ui/base/x/x11_util.cc
+++ b/ui/base/x/x11_util.cc
@@ -469,6 +469,18 @@ void* GetVisualFromGtkWidget(GtkWidget* widget) {
 }
 #endif  // defined(TOOLKIT_GTK)
 
+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);
+}
+
 int BitsPerPixelForPixmapDepth(Display* dpy, int depth) {
   int count;
   XPixmapFormatValues* formats = XListPixmapFormats(dpy, &count);