Upstream Chrome on iOS source code [9/11].

ios/chrome/browser/ui/toolbar/new_tab_button.h

+// Copyright 2012 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 IOS_CHROME_BROWSER_UI_TOOLBAR_NEW_TAB_BUTTON_H_
+#define IOS_CHROME_BROWSER_UI_TOOLBAR_NEW_TAB_BUTTON_H_
+
+#import <UIKit/UIKit.h>
+
+// UIButton subclass used for the New Tab button in the phone switcher toolbar
+// and the tablet no-tabs toolbar. A NewTabButton has a custom background rect
+// and by default will call it's own (derived) -chromeExecuteCommand method
+// on |TouchUpInside|, and has a tag of |IDC_NEW_TAB|. Instances can add further
+// targets.
+@interface NewTabButton : UIButton
+// Whether the button opens incognito tabs or not; setting this property changes
+// the button's behavior, updating its tag to
+// IDS_IOS_TOOLS_MENU_NEW_INCOGNITO_TAB, and updates its appearance.
+@property(nonatomic, assign, getter=isIncognito) BOOL incognito;
+
+// If |animated|, animates the transition of the foreground image of the button.
+- (void)setIncognito:(BOOL)incognito animated:(BOOL)animated;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_TOOLBAR_NEW_TAB_BUTTON_H_