Upstream code and resources for Chrome on iOS extensions.

ios/chrome/today_extension/notification_center_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_TODAY_EXTENSION_NOTIFICATION_CENTER_BUTTON_H_
+#define IOS_CHROME_TODAY_EXTENSION_NOTIFICATION_CENTER_BUTTON_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/today_extension/transparent_button.h"
+
+// A button with a separated view background. This is needed as background
+// objects in notification center must be subviews of a UIVisualEffectView.
+@interface NotificationCenterButton : TransparentButton
+
+// Designated initializer.
+// Initializes a button with |title|, normal icon with asset named |icon|,
+// calling [target action] on UIControlEventTouchUpInside
+// event. |backgroundColor|, |inkColor|, |titleColor| are respectively the
+// background inactive color, the background pressed color, and the title color.
+- (instancetype)initWithTitle:(NSString*)title
+                         icon:(NSString*)icon
+                       target:(id)target
+                       action:(SEL)action
+              backgroundColor:(UIColor*)backgroundColor
+                     inkColor:(UIColor*)inkColor
+                   titleColor:(UIColor*)titleColor;
+
+// Sets the different spaces of the button.
+// |separator| is the distance between the left of the icon and the left of the
+// text (in LTR),
+// |frontShift| shifts the center of the button to the front by |frontShift|/2,
+// (front is left in LTR, right in RTL).
+// |horizontalPadding| sets the left and right paddings,
+// |verticalPadding| sets the top and bottom paddings.
+- (void)setButtonSpacesSeparator:(const CGFloat)separator
+                      frontShift:(const CGFloat)frontShift
+               horizontalPadding:(const CGFloat)horizontalPadding
+                 verticalPadding:(const CGFloat)verticalPadding;
+
+@end
+
+#endif  // IOS_CHROME_TODAY_EXTENSION_NOTIFICATION_CENTER_BUTTON_H_