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

chrome/browser/chromeos/login/screens/user_selection_screen.cc

 // 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.
 
 #include "chrome/browser/chromeos/login/screens/user_selection_screen.h"
 
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/values.h"
@@ skipping 453 matching lines @@
   service->SetHardlockState(EasyUnlockScreenlockStateHandler::USER_HARDLOCK);
 }
 
 void UserSelectionScreen::AttemptEasyUnlock(const std::string& user_id) {
   EasyUnlockService* service = GetEasyUnlockServiceForUser(user_id);
   if (!service)
     return;
   service->AttemptAuth(user_id);
 }
 
+void UserSelectionScreen::RecordClickOnLockIcon(const std::string& user_id) {
+  EasyUnlockService* service = GetEasyUnlockServiceForUser(user_id);
+  if (!service)
+    return;
+  service->RecordClickOnLockIcon();
+}
+
 EasyUnlockService* UserSelectionScreen::GetEasyUnlockServiceForUser(
     const std::string& user_id) const {
   if (GetScreenType() == OTHER_SCREEN)
     return nullptr;
 
   const user_manager::User* unlock_user = nullptr;
   for (const user_manager::User* user : GetUsers()) {
     if (user->email() == user_id) {
       unlock_user = user;
       break;
     }
   }
   if (!unlock_user)
     return nullptr;
 
   ProfileHelper* profile_helper = ProfileHelper::Get();
   Profile* profile = profile_helper->GetProfileByUser(unlock_user);
 
   // The user profile should exist if and only if this is the lock screen.
   DCHECK_EQ(!!profile, GetScreenType() == LOCK_SCREEN);
 
   if (!profile)
     profile = profile_helper->GetSigninProfile();
 
   return EasyUnlockService::Get(profile);
 }
 
 }  // namespace chromeos