Fix X11TopmostWindowFinder

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 b39dacf56bf0873fb2652e17033dc3efc43e3f67..b8a6e5f319a62f3b057e2723dfe31c7009f93c80 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
@@ -15,6 +15,7 @@
 #include "ui/base/cursor/cursor_loader_x11.h"
 #include "ui/events/event_source.h"
 #include "ui/events/platform/platform_event_dispatcher.h"
+#include "ui/gfx/insets.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/x/x11_atom_cache.h"
 #include "ui/views/views_export.h"
@@ -58,6 +59,14 @@ class VIEWS_EXPORT DesktopWindowTreeHostX11
   // Returns the current bounds in terms of the X11 Root Window.
   gfx::Rect GetX11RootWindowBounds() const;
 
+  // Returns the current bounds in terms of the X11 Root Window including the
+  // borders provided by the window manager (if any).
+  gfx::Rect GetX11RootWindowOuterBounds() const;
+
+  // Returns the window shape if the window is not rectangular. Returns NULL
+  // otherwise.
+  ::Region GetWindowShape() const;
+
   // Called by X11DesktopHandler to notify us that the native windowing system
   // has changed our activation.
   void HandleNativeWidgetActivationChanged(bool active);
@@ -163,6 +172,12 @@ private:
   // detect that they're there.
   bool IsWindowManagerPresent();
 
+  // Called when |xwindow_|'s _NET_WM_STATE property is updated.
+  void OnWMStateUpdated();
+
+  // Called when |xwindow_|'s _NET_FRAME_EXTENTS property is updated.
+  void OnFrameExtentsUpdated();
+
   // Sends a message to the x11 window manager, enabling or disabling the
   // states |state1| and |state2|.
   void SetWMSpecState(bool enabled, ::Atom state1, ::Atom state2);
@@ -280,8 +295,14 @@ private:
 
   ObserverList<DesktopWindowTreeHostObserverX11> observer_list_;
 
-  // Copy of custom window shape specified via SetShape(), if any.
-  ::Region custom_window_shape_;
+  // The window shape if the window is non-rectangular.
+  ::Region window_shape_;
+
+  // Whether |window_shape_| was set via SetShape().
+  bool custom_window_shape_;
+
+  // The size of the window manager provided borders (if any).
+  gfx::Insets native_window_frame_borders_;
 
   // The current root window host that has capture. While X11 has something
   // like Windows SetCapture()/ReleaseCapture(), it is entirely implicit and