Adding mediator for Sign-in promo

ios/chrome/browser/ui/settings/cells/signin_promo_item.h

-// Copyright 2017 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_SETTINGS_CELLS_SIGNIN_PROMO_ITEM_H_
-#define IOS_CHROME_BROWSER_UI_SETTINGS_CELLS_SIGNIN_PROMO_ITEM_H_
-
-#import <UIKit/UIKit.h>
-
-#import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
-#import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
-
-@class MDCFlatButton;
-
-// SigninPromoItem is an item that configures a SigninPromoCell cell.
-@interface SigninPromoItem : CollectionViewItem
-
-// Item image.
-@property(nonatomic, copy) UIImage* profileImage;
-@property(nonatomic, copy) NSString* profileName;
-@property(nonatomic, copy) NSString* profileEmail;
-
-@end
-
-// Cell representation for SigninPromoItem. The cell displays an image, a title
-// text label, a sign-in button and a "Not me" button. This is intended to be
-// used to let the user sign-in without entering his/her password based on a
-// profile already known in Chrome/Chromium. The user can also remove the
-// suggested profile if (s)he is not related to the suggested profile, using the
-// "Not me" button.
-@interface SigninPromoCell : MDCCollectionViewCell
-
-// Profile imageView.
-@property(nonatomic, readonly, strong) UIImageView* imageView;
-// Cell title.
-@property(nonatomic, readonly, strong) UILabel* textLabel;
-// Signin button.
-@property(nonatomic, readonly, strong) MDCFlatButton* signinButton;
-// Not-me button.
-@property(nonatomic, readonly, strong) MDCFlatButton* notMeButton;
-
-@end
-
-#endif  // IOS_CHROME_BROWSER_UI_SETTINGS_CELLS_SIGNIN_PROMO_ITEM_H_