Upstream Chrome on iOS source code [8/11].

ios/chrome/browser/ui/settings/reauthentication_module.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_SETTINGS_REAUTHENTICATION_MODULE_H_
+#define IOS_CHROME_BROWSER_UI_SETTINGS_REAUTHENTICATION_MODULE_H_
+
+#import <Foundation/Foundation.h>
+
+#import "ios/chrome/browser/ui/settings/reauthentication_protocol.h"
+
+@protocol SuccessfulReauthTimeAccessor<NSObject>
+
+// Method meant to be called by the |ReauthenticationModule| to update
+// the time of the last successful re-authentication.
+- (void)updateSuccessfulReauthTime;
+
+// Returns the time of the last successful re-authentication.
+- (NSDate*)lastSuccessfulReauthTime;
+
+@end
+
+/**
+ * This is used by |PasswordsDetailsCollectionViewController| to re-authenticate
+ * the user before displaying the password in plain text, or allowing it to be
+ * copied.
+ */
+@interface ReauthenticationModule : NSObject<ReauthenticationProtocol>
+
+// The designated initializer. |successfulReauthTimeAccessor| must not be nil.
+- (instancetype)initWithSuccessfulReauthTimeAccessor:
+    (id<SuccessfulReauthTimeAccessor>)successfulReauthTimeAccessor
+    NS_DESIGNATED_INITIALIZER;
+
+- (instancetype)init NS_UNAVAILABLE;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SETTINGS_REAUTHENTICATION_MODULE_H_