session_manager: Tracks user sessions

components/session_manager/core/session_manager.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/session_manager/core/session_manager.h"
 
+#include <algorithm>
+
 #include "base/logging.h"
 #include "build/build_config.h"
+#include "components/user_manager/user_manager.h"
 
 namespace session_manager {
 
 // static
-SessionManager* SessionManager::instance = NULL;
+SessionManager* SessionManager::instance = nullptr;
 
 SessionManager::SessionManager() {
   DCHECK(!SessionManager::Get());
   SessionManager::SetInstance(this);
 }
 
 SessionManager::~SessionManager() {
-  DCHECK(instance == this);
-  SessionManager::SetInstance(NULL);
+  DCHECK_EQ(instance, this);
+  SessionManager::SetInstance(nullptr);
 }
 
 // static
 SessionManager* SessionManager::Get() {
   return SessionManager::instance;
 }
 
 void SessionManager::SetSessionState(SessionState state) {
   VLOG(1) << "Changing session state to: " << static_cast<int>(state);
 
   if (session_state_ != state) {
     // TODO(nkostylev): Notify observers about the state change.
     // TODO(nkostylev): Add code to process session state change and probably
     // replace delegate_ if needed.
     session_state_ = state;
   }
 }
 
+void SessionManager::CreateSession(const AccountId& user_account_id,
+                                   const std::string& user_id_hash,
+                                   bool browser_restart) {
+  DCHECK(std::find_if(sessions_.begin(), sessions_.end(),

[achuithb, 2016/10/31 21:55:57]

Nice

+                      [user_account_id](const Session& session) {
+                        return session.user_account_id == user_account_id;
+                      }) == sessions_.end());
+
+  sessions_.push_back({next_id_++, user_account_id});
+  NotifyUserLoggedIn(user_account_id, user_id_hash, browser_restart);
+}
+
 bool SessionManager::IsSessionStarted() const {
   return session_started_;
 }
 
 void SessionManager::SessionStarted() {
   session_started_ = true;
 }
 
+void SessionManager::NotifyUserLoggedIn(const AccountId& user_account_id,
+                                        const std::string& user_id_hash,
+                                        bool browser_restart) {
+  user_manager::UserManager* user_manager = user_manager::UserManager::Get();

[achuithb, 2016/10/31 21:55:57]

auto* may be fine here

[xiyuan, 2016/10/31 22:29:45]

Done.

+  if (!user_manager)
+    return;
+  user_manager->UserLoggedIn(user_account_id, user_id_hash, browser_restart);
+}
+
 // static
 void SessionManager::SetInstance(SessionManager* session_manager) {
   SessionManager::instance = session_manager;
 }
 
 }  // namespace session_manager