Introduce WindowStateDelegate::ToggleFullscreen

ash/accelerators/accelerator_commands.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 ASH_ACCELERATORS_ACCELERATOR_COMMANDS_H_
 #define ASH_ACCELERATORS_ACCELERATOR_COMMANDS_H_
 
 #include "ash/ash_export.h"
 
 // This file contains implementations of commands that are bound to keyboard
 // shortcuts in Ash or in the embedding application (e.g. Chrome).
 namespace ash {
 namespace accelerators {
 
 // Minimizes the active window, if present. If no windows are active, restores
 // the first unminimized window. Returns true if a window was minimized or
 // restored.
 ASH_EXPORT bool ToggleMinimized();
 
 // Toggles the maxmized state. If the window is in fulllscreen, it exits
 // fullscreen mode.
 ASH_EXPORT void ToggleMaximized();
 
+// Toggles the fullscreen state. If the window is already in
+// maximized, it exits maximized mode. The behavior can be overridden

[pkotwicz, 2013/10/29 00:46:01]

"If the window is already in maximized, it exits maximized mode." is not true

+// by |WindowStateDelegate::ToggleFullscreen()|.
+ASH_EXPORT void ToggleFullscreen();
+
 }  // namespace accelerators
 }  // namespace ash
 
 #endif  // ASH_ACCELERATORS_ACCELERATOR_COMMANDS_H_