Upstream Chrome on iOS source code [5/11].

ios/chrome/browser/ui/ntp/new_tab_page_bar_button.h

+// Copyright 2015 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_NTP_NEW_TAB_PAGE_BAR_BUTTON_H_
+#define IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_BAR_BUTTON_H_
+
+#import <Foundation/Foundation.h>
+#import <UIKit/UIKit.h>
+
+@class NewTabPageBarItem;
+
+namespace new_tab_page_bar_button {
+
+enum class ContentType {
+  IMAGE,
+  TEXT,
+};
+
+}  // namespace new_tab_page_bar_button
+
+// Represents a button in the new tab page bar.
+@interface NewTabPageBarButton : UIButton
+
+// Returns an autoreleased button based on |item|'s |title| and |image|. By
+// defaults, the button shows the title instead of the image, and with a non
+// incognito color scheme.
++ (instancetype)buttonWithItem:(NewTabPageBarItem*)item;
+
+// Selects which color scheme to use for the buttons. If |percentage| is 1.0,
+// the color scheme is for incognito. If |percentage| is 0.0, the color scheme
+// is for non incognito. If |percentage| is in-between, the color scheme is an
+// interpolation between the two.
+// Percentage must be in the interval [0, 1].
+- (void)useIncognitoColorScheme:(CGFloat)percentage;
+
+// Selects which kind of content the button should display.
+- (void)setContentToDisplay:(new_tab_page_bar_button::ContentType)contentType;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_NTP_NEW_TAB_PAGE_BAR_BUTTON_H_