Positions the launcher in the bottom left corner. Adds ShellDelegate

ui/aura/desktop.h

 // Copyright (c) 2011 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 UI_AURA_DESKTOP_H_
 #define UI_AURA_DESKTOP_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ skipping 76 matching lines @@
   void ActivateTopmostWindow();
 
   // Deactivates |window| and activates the topmost window. Does nothing if
   // |window| is not a topmost window, or there are no other suitable windows to
   // activate.
   void Deactivate(Window* window);
 
   // Invoked from RootWindow when |window| is being destroyed.
   void WindowDestroying(Window* window);
 
+  // Invoked when a window is added.
+  void WindowAdded(Window* window);
+
+  // Invoked when a window is removed.
+  void WillRemoveWindow(Window* window);
+
   // Returns the desktop's dispatcher. The result should only be passed to
   // MessageLoopForUI::Run() or MessageLoopForUI::RunAllPendingWithDispatcher(),
   // or used to dispatch an event by |Dispatch(const NativeEvent&)| on it.
   // It must never be stored.
   MessageLoop::Dispatcher* GetDispatcher();
 
   static Desktop* GetInstance();
 
  private:
   // Overridden from ui::CompositorDelegate
@@ skipping 20 matching lines @@
   // Are we in the process of being destroyed? Used to avoid processing during
   // destruction.
   bool in_destructor_;
 
   DISALLOW_COPY_AND_ASSIGN(Desktop);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_DESKTOP_H_