Fix Z-order for a bubble when it appears for inactive window.

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc

Index: ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
diff --git a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
index 69c5b2f44a8f567170a4288df8c584b1ddf81b19..0a9a4ae77a03f5d327d4e77531da4a9a5049deac 100644
--- a/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
+++ b/ui/views/widget/desktop_aura/desktop_window_tree_host_x11.cc
@@ -413,6 +413,9 @@ void DesktopWindowTreeHostX11::SetSize(const gfx::Size& requested_size) {
   }
 }
 
+void DesktopWindowTreeHostX11::StackAbove(aura::Window* window) {
+}

[sky, 2015/06/02 16:32:57]

Is it not possible to implement this on X?

[vasilii, 2015/06/03 13:47:38]

The bubble isn't an X window.
I think it's doable with XRestackWindows. It can be called for siblings only.
Chrome windows aren't siblings. I see on my Goobuntu that a Chrome window has 2
parents before the root. Probably added by a window manager.

+
 void DesktopWindowTreeHostX11::StackAtTop() {
   XRaiseWindow(xdisplay_, xwindow_);
 }