x11: Don't wait on a MapNotify on override-redirect windows.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
index 1d3cbd7f8773b6c052e5c2115c3bec5ea79338c5..30d337d98b3c0cd149280755b4f8067aa857f45b 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h
@@ -184,6 +184,13 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // Called when |xwindow_|'s _NET_FRAME_EXTENTS property is updated.
   void OnFrameExtentsUpdated();
 
+  // Called when |xwindow_| is mapped, either directly (in the case of
+  // override-redirect windows) or in response to a MapNotify event.
+  void OnX11WindowMapped();
+
+  // Called when |xwindow_| is unmapped.
+  void OnX11WindowUnmapped();
+
   // Updates |xwindow_|'s minimum and maximum size.
   void UpdateMinAndMaxSize();
 
@@ -289,6 +296,9 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // True if the window should stay on top of most other windows.
   bool is_always_on_top_;
 
+  // True if the window has the override_redirect bit set.
+  bool is_override_redirect_;
+
   // True if the window has title-bar / borders provided by the window manager.
   bool use_native_frame_;