Upstream Chrome on iOS source code [3/11].

ios/chrome/browser/ui/authentication/signin_account_selector_view_controller.h

+// Copyright 2016 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_AUTHENTICATION_SIGNIN_ACCOUNT_SELECTOR_VIEW_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_ACCOUNT_SELECTOR_VIEW_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/chrome/browser/ui/collection_view/collection_view_controller.h"
+
+@class ChromeIdentity;
+@class SigninAccountSelectorViewController;
+
+@protocol SigninAccountSelectorViewControllerDelegate
+
+// Informs the delegate that the user has tapped on the add account button.
+- (void)accountSelectorControllerDidSelectAddAccount:
+    (SigninAccountSelectorViewController*)accountSelectorController;
+
+@end
+
+// A collection view controller that allows the user to select the account to be
+// signed in.
+@interface SigninAccountSelectorViewController : CollectionViewController
+
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)initWithStyle:(CollectionViewControllerStyle)style
+    NS_UNAVAILABLE;
+
+@property(nonatomic, assign) id<SigninAccountSelectorViewControllerDelegate>
+    delegate;
+
+// Returns the identity that is selected or nil.
+- (ChromeIdentity*)selectedIdentity;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_ACCOUNT_SELECTOR_VIEW_CONTROLLER_H_