Hook up ProximityAuthSystem in EasyUnlockService.

components/proximity_auth/screenlock_bridge.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 "components/proximity_auth/screenlock_bridge.h"
 
 #include "base/logging.h"
 #include "base/strings/string16.h"
 
 #if defined(OS_CHROMEOS)
@@ skipping 127 matching lines @@
     FOR_EACH_OBSERVER(Observer, observers_, OnScreenDidUnlock(screen_type));
 }
 
 void ScreenlockBridge::SetFocusedUser(const std::string& user_id) {
   if (user_id == focused_user_id_)
     return;
   focused_user_id_ = user_id;
   FOR_EACH_OBSERVER(Observer, observers_, OnFocusedUserChanged(user_id));
 }
 
+std::string ScreenlockBridge::GetFocusedUser() {
+  return focused_user_id_;
+}
+
 bool ScreenlockBridge::IsLocked() const {
   return lock_handler_ != nullptr;
 }
 
 void ScreenlockBridge::Lock() {
 #if defined(OS_CHROMEOS)
   chromeos::SessionManagerClient* session_manager =
       chromeos::DBusThreadManager::Get()->GetSessionManagerClient();
   session_manager->RequestLockScreen();
 #else
@@ skipping 14 matching lines @@
   observers_.RemoveObserver(observer);
 }
 
 ScreenlockBridge::ScreenlockBridge() : lock_handler_(nullptr) {
 }
 
 ScreenlockBridge::~ScreenlockBridge() {
 }
 
 }  // namespace proximity_auth