[Smart Lock] Measure clicks on the lock icon during Easy Unlock's trial run.

chrome/browser/chromeos/login/screens/user_selection_screen.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_CHROMEOS_LOGIN_SCREENS_USER_SELECTION_SCREEN_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_SELECTION_SCREEN_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 63 matching lines @@
 
   void Unlock(const std::string& user_email) override;
   void AttemptEasySignin(const std::string& user_email,
                          const std::string& secret,
                          const std::string& key_label) override;
 
   // UserBoardModel implementation.
   void SendUserList() override;
   void HardLockPod(const std::string& user_id) override;
   void AttemptEasyUnlock(const std::string& user_id) override;
+  void RecordClickOnLockIcon(const std::string& user_id) override;
 
   // Fills |user_dict| with information about |user|.
   static void FillUserDictionary(
       user_manager::User* user,
       bool is_owner,
       bool is_signin_to_add,
       AuthType auth_type,
       const std::vector<std::string>* public_session_recommended_locales,
       base::DictionaryValue* user_dict);
 
@@ skipping 30 matching lines @@
 
   // Timer for measuring idle state duration before password clear.
   base::OneShotTimer<UserSelectionScreen> password_clear_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(UserSelectionScreen);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_USER_SELECTION_SCREEN_H_