Add ShellAcceleratorController that manages global keyboard accelerators (2nd try).

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 124 matching lines @@
 
   // Sets capture to the specified window.
   void SetCapture(Window* window);
 
   // If |window| has mouse capture, the current capture window is set to NULL.
   void ReleaseCapture(Window* window);
 
   // Overridden from Window:
   virtual void SetTransform(const ui::Transform& transform) OVERRIDE;
 
+#if !defined(NDEBUG)
+  // Toggles the host's full screen state.
+  void ToggleFullScreen();
+#endif
+
  private:
   // Called whenever the mouse moves, tracks the current |mouse_moved_handler_|,
   // sending exited and entered events as its value changes.
   void HandleMouseMoved(const MouseEvent& event, Window* target);
 
   bool ProcessMouseEvent(Window* target, MouseEvent* event);
   bool ProcessKeyEvent(Window* target, KeyEvent* event);
   ui::TouchStatus ProcessTouchEvent(Window* target, TouchEvent* event);
 
   // Overridden from ui::CompositorDelegate
@@ skipping 68 matching lines @@
   Window* mouse_moved_handler_;
   Window* focused_window_;
   Window* touch_event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(Desktop);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_DESKTOP_H_