Implement back/forward toolbar menus on Mac....

chrome/browser/cocoa/back_forward_menu_controller.h

+// Copyright (c) 2009 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_COCOA_BACK_FORWARD_MENU_CONTROLLER_H_
+#define CHROME_BROWSER_COCOA_BACK_FORWARD_MENU_CONTROLLER_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/scoped_nsobject.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/back_forward_menu_model.h"
+
+@class DelayedMenuButton;
+
+typedef BackForwardMenuModel::ModelType BackForwardMenuType;
+const BackForwardMenuType BACK_FORWARD_MENU_TYPE_BACK =
+    BackForwardMenuModel::BACKWARD_MENU;
+const BackForwardMenuType BACK_FORWARD_MENU_TYPE_FORWARD =
+    BackForwardMenuModel::FORWARD_MENU;
+
+// A class that manages the back/forward menu (and delayed-menu button, and
+// model).
+
+@interface BackForwardMenuController : NSObject {
+ @private
+  BackForwardMenuType type_;
+  DelayedMenuButton* button_;           // Weak; comes from nib.
+  scoped_ptr<BackForwardMenuModel> model_;
+  scoped_nsobject<NSMenu> menu_;
+}
+
+// Type (back or forwards); can only be set on initialization.
+@property(readonly, nonatomic) BackForwardMenuType type;
+
+- (id)initWithBrowser:(Browser*)browser
+            modelType:(BackForwardMenuType)type
+               button:(DelayedMenuButton*)button;
+
+@end  // @interface BackForwardMenuController
+
+#endif  // CHROME_BROWSER_COCOA_BACK_FORWARD_MENU_CONTROLLER_H_