easy-signin: Wire GetSignInChallenge.

chrome/browser/signin/easy_unlock_service.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 CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 #define CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 52 matching lines @@
   virtual const base::ListValue* GetRemoteDevices() const = 0;
   virtual void SetRemoteDevices(const base::ListValue& devices) = 0;
   virtual void ClearRemoteDevices() = 0;
 
   // Runs the flow for turning Easy unlock off.
   virtual void RunTurnOffFlow() = 0;
 
   // Resets the turn off flow if one is in progress.
   virtual void ResetTurnOffFlow() = 0;
 
-  // Returns the cirernt turn off flow status.
+  // Returns the current turn off flow status.
   virtual TurnOffFlowStatus GetTurnOffFlowStatus() const = 0;
 
+  // Gets the challenge bytes for the currently associated user.
+  virtual std::string GetChallenge() const = 0;
+
   // Gets |screenlock_state_handler_|. Returns NULL if Easy Unlock is not
   // allowed. Otherwise, if |screenlock_state_handler_| is not set, an instance
   // is created. Do not cache the returned value, as it may go away if Easy
   // Unlock gets disabled.
   EasyUnlockScreenlockStateHandler* GetScreenlockStateHandler();
 
   // Whether easy unlock is allowed to be used. If the controlling preference
   // is set (from policy), this returns the preference value. Otherwise, it is
   // permitted either the flag is enabled or its field trial is enabled.
   bool IsAllowed();
@@ skipping 56 matching lines @@
 #endif
 
   ObserverList<EasyUnlockServiceObserver> observers_;
 
   base::WeakPtrFactory<EasyUnlockService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(EasyUnlockService);
 };
 
 #endif  // CHROME_BROWSER_SIGNIN_EASY_UNLOCK_SERVICE_H_