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

ui/views/widget/desktop_aura/desktop_window_tree_host_x11.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.
 
 #include "ui/views/widget/desktop_aura/desktop_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 395 matching lines @@
   bool size_changed = bounds_in_pixels_.size() != size_in_pixels;
   XResizeWindow(xdisplay_, xwindow_, size_in_pixels.width(),
                 size_in_pixels.height());
   bounds_in_pixels_.set_size(size_in_pixels);
   if (size_changed) {
     OnHostResized(size_in_pixels);
     ResetWindowRegion();
   }
 }
 
+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_);
 }
 
 void DesktopWindowTreeHostX11::CenterWindow(const gfx::Size& size) {
   gfx::Size size_in_pixels = ToPixelRect(gfx::Rect(size)).size();
   gfx::Rect parent_bounds_in_pixels = GetWorkAreaBoundsInPixels();
 
   // If |window_|'s transient parent bounds are big enough to contain |size|,
   // use them instead.
@@ skipping 1571 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views