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

ios/chrome/browser/ui/settings/reauthentication_protocol.h

Index: ios/chrome/browser/ui/settings/reauthentication_protocol.h
diff --git a/ios/chrome/browser/ui/settings/reauthentication_protocol.h b/ios/chrome/browser/ui/settings/reauthentication_protocol.h
new file mode 100644
index 0000000000000000000000000000000000000000..ba63a9e2eb3b57da56abb5480a260bdd48cfffee
--- /dev/null
+++ b/ios/chrome/browser/ui/settings/reauthentication_protocol.h
@@ -0,0 +1,23 @@
+// 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_PROTOCOL_H_
+#define IOS_CHROME_BROWSER_UI_SETTINGS_REAUTHENTICATION_PROTOCOL_H_
+
+#import <Foundation/Foundation.h>
+
+@protocol ReauthenticationProtocol<NSObject>
+
+// Checks whether Touch ID and/or passcode is enabled for the device.
+- (BOOL)canAttemptReauth;
+
+// Attempts to reauthenticate the user with Touch ID or passcode if Touch ID is
+// not available and the device is running iOS 9. |handler|
+// will take action depending on the result of the reauth attempt.
+- (void)attemptReauthWithLocalizedReason:(NSString*)localizedReason
+                                 handler:(void (^)(BOOL success))handler;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_SETTINGS_REAUTHENTICATION_PROTOCOL_H_