Layout panels on top of their launcher icons

ash/launcher/launcher.h

 // 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.
 
 #ifndef ASH_LAUNCHER_LAUNCHER_H_
 #define ASH_LAUNCHER_LAUNCHER_H_
 #pragma once
 
 #include "ash/launcher/background_animator.h"
 #include "base/basictypes.h"
@@ skipping 12 matching lines @@
 class Widget;
 }
 
 namespace ash {
 
 namespace internal {
 class FocusCycler;
 class LauncherView;
 }
 
+class LauncherIconObserver;
 class LauncherDelegate;
 class LauncherModel;
 
 class ASH_EXPORT Launcher : public internal::BackgroundAnimatorDelegate {
  public:
   explicit Launcher(aura::Window* window_container);
   virtual ~Launcher();
 
   // Sets the focus cycler.  Also adds the launcher to the cycle.
   void SetFocusCycler(internal::FocusCycler* focus_cycler);
   internal::FocusCycler* GetFocusCycler();
 
   // Sets whether the launcher paints a background. Default is false, but is set
   // to true if a window overlaps the shelf.
   void SetPaintsBackground(
       bool value,
       internal::BackgroundAnimator::ChangeType change_type);
 
   // Sets the width of the status area.
   void SetStatusWidth(int width);
   int GetStatusWidth();
 
   // Returns the screen bounds of the item for the specified window. If there is
   // no item for the specified window an empty rect is returned.
   gfx::Rect GetScreenBoundsOfItemIconForWindow(aura::Window* window);
 
+  void AddIconObserver(LauncherIconObserver* observer);
+  void RemoveIconObserver(LauncherIconObserver* observer);
+
   // Returns true if the Launcher is showing a context menu.
   bool IsShowingMenu() const;
 
   // Only to be called for testing. Retrieves the LauncherView.
   // TODO(sky): remove this!
   internal::LauncherView* GetLauncherViewForTest();
 
   LauncherDelegate* delegate() { return delegate_.get(); }
 
   LauncherModel* model() { return model_.get(); }
@@ skipping 24 matching lines @@
 
   // Used to animate the background.
   internal::BackgroundAnimator background_animator_;
 
   DISALLOW_COPY_AND_ASSIGN(Launcher);
 };
 
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_H_