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

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

+// Copyright 2014 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_INTERACTION_CONTROLLER_H_
+#define IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_INTERACTION_CONTROLLER_H_
+
+#import <UIKit/UIKit.h>
+
+#import "base/ios/block_types.h"
+#include "components/signin/core/browser/signin_metrics.h"
+#include "ios/chrome/browser/signin/constants.h"
+
+namespace ios {
+class ChromeBrowserState;
+}
+
+// Interaction controller for sign-in related operations. This class is mainly a
+// proxy for |ChromeSigninViewController|, calling directly
+// |ChromeIdentityInteractionManager| for the no-accounts case.
+@interface SigninInteractionController : NSObject
+
+// Designated initializer.
+// * |browserState| is the current browser state
+// * |presentingViewController| is the top presented view controller.
+// * |isPresentedOnSettings| indicates whether the settings view controller is
+//   part of the presented view controllers stack
+// * |accessPoint| represents the access point that initiated the sign-in.
+- (instancetype)initWithBrowserState:(ios::ChromeBrowserState*)browserState
+            presentingViewController:(UIViewController*)presentingViewController
+               isPresentedOnSettings:(BOOL)isPresentedOnSettings
+                   signInAccessPoint:(signin_metrics::AccessPoint)accessPoint;
+
+// Starts user sign-in. The completion block will be called when the operation
+// is done, and |succeeded| will notify the caller on whether the user is now
+// signed in.
+- (void)signInWithCompletion:(signin_ui::CompletionCallback)completion
+              viewController:(UIViewController*)viewController;
+
+// Re-authenticate the user. This method will always show a sign-in web flow.
+// The completion block will be called when the operation is done, and
+// |succeeded| will notify the caller on whether the user has been
+// correctly re-authenticated.
+- (void)reAuthenticateWithCompletion:(signin_ui::CompletionCallback)completion
+                      viewController:(UIViewController*)viewController;
+
+// Starts the flow to add an identity via ChromeIdentityInteractionManager.
+- (void)addAccountWithCompletion:(signin_ui::CompletionCallback)completion
+                  viewController:(UIViewController*)viewController;
+
+// Cancels any current process. Calls the completion callback when done.
+- (void)cancel;
+
+// Cancels any current process and dismisses any UI. Calls the completion
+// callback when done.
+- (void)cancelAndDismiss;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_AUTHENTICATION_SIGNIN_INTERACTION_CONTROLLER_H_