Add always-on-top property to app windows

chrome/browser/ui/gtk/apps/native_app_window_gtk.h

 // Copyright 2013 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_APPS_NATIVE_APP_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_GTK_APPS_NATIVE_APP_WINDOW_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "apps/native_app_window.h"
@@ skipping 62 matching lines @@
   virtual void UpdateWindowTitle() OVERRIDE;
   virtual void HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual void UpdateInputRegion(scoped_ptr<SkRegion> region) OVERRIDE;
   virtual void UpdateDraggableRegions(
       const std::vector<extensions::DraggableRegion>& regions) OVERRIDE;
   virtual gfx::Insets GetFrameInsets() const OVERRIDE;
   virtual bool IsVisible() const OVERRIDE;
   virtual void HideWithApp() OVERRIDE;
   virtual void ShowWithApp() OVERRIDE;
+  virtual void SetAlwaysOnTop(bool always_on_top) OVERRIDE;
 
   // web_modal::WebContentsModalDialogHost implementation.
   virtual gfx::NativeView GetHostView() const OVERRIDE;
   virtual gfx::Point GetDialogPosition(const gfx::Size& size) OVERRIDE;
   virtual gfx::Size GetMaximumDialogSize() OVERRIDE;
   virtual void AddObserver(
       web_modal::ModalDialogHostObserver* observer) OVERRIDE;
   virtual void RemoveObserver(
       web_modal::ModalDialogHostObserver* observer) OVERRIDE;
 
@@ skipping 54 matching lines @@
   // If true, don't call gdk_window_raise() when we get a click in the title
   // bar or window border.  This is to work around a compiz bug.
   bool suppress_window_raise_;
 
   // True if the window shows without frame.
   bool frameless_;
 
   // True if the window should be resizable by the user.
   bool resizable_;
 
+  // True if the window should be kept on top of other windows that do not have
+  // this flag enabled.
+  bool always_on_top_;
+
   // The current window cursor.  We set it to a resize cursor when over the
   // custom frame border.  We set it to NULL if we want the default cursor.
   GdkCursor* frame_cursor_;
 
   // The timer used to save the window position for session restore.
   base::OneShotTimer<NativeAppWindowGtk> window_configure_debounce_timer_;
 
   // The Extension Keybinding Registry responsible for registering listeners for
   // accelerators that are sent to the window, that are destined to be turned
   // into events and sent to the extension.
   scoped_ptr<ExtensionKeybindingRegistryGtk> extension_keybinding_registry_;
 
   // Observers to be notified when any web contents modal dialog requires
   // updating its dimensions.
   ObserverList<web_modal::ModalDialogHostObserver> observer_list_;
 
   ui::X11AtomCache atom_cache_;
 
   // True if we listen for the XEvent.
   bool is_x_event_listened_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeAppWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_APPS_NATIVE_APP_WINDOW_GTK_H_