[Mac] Update fullscreen state when window is fullscreened natively.

chrome/browser/ui/cocoa/apps/native_app_window_cocoa.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_COCOA_APPS_NATIVE_APP_WINDOW_COCOA_H_
 #define CHROME_BROWSER_UI_COCOA_APPS_NATIVE_APP_WINDOW_COCOA_H_
 
 #import <Cocoa/Cocoa.h>
 #include <vector>
 
@@ skipping 83 matching lines @@
 
   // Called when the window is minimized.
   void WindowDidMiniaturize();
 
   // Called when the window is un-minimized.
   void WindowDidDeminiaturize();
 
   // Called when the window is zoomed (maximized or de-maximized).
   void WindowWillZoom();
 
+  // Called when the window enters fullscreen.
+  void WindowDidEnterFullscreen();
+
+  // Called when the window exits fullscreen.
+  void WindowDidExitFullscreen();
+
   // Called to handle a key event.
   bool HandledByExtensionCommand(NSEvent* event);
 
   // Returns true if |point| in local Cocoa coordinate system falls within
   // the draggable region.
   bool IsWithinDraggableRegion(NSPoint point) const;
 
   NSRect restored_bounds() const { return restored_bounds_; }
 
  protected:
@@ skipping 92 matching lines @@
   std::vector<extensions::DraggableRegion> draggable_regions_;
 
   // The Extension Command Registry used to determine which keyboard events to
   // handle.
   scoped_ptr<ExtensionKeybindingRegistryCocoa> extension_keybinding_registry_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeAppWindowCocoa);
 };
 
 #endif  // CHROME_BROWSER_UI_COCOA_APPS_NATIVE_APP_WINDOW_COCOA_H_