ash: Add SessionController/Client mojo interfaces

chrome/browser/ui/ash/session_controller_client.h

+// Copyright 2016 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_UI_ASH_SESSION_CONTROLLER_CLIENT_H_
+#define CHROME_BROWSER_UI_ASH_SESSION_CONTROLLER_CLIENT_H_
+
+#include "ash/public/interfaces/session_controller.mojom.h"
+#include "base/macros.h"
+#include "components/session_manager/core/session_manager_observer.h"
+#include "components/user_manager/user_manager.h"
+#include "mojo/public/cpp/bindings/binding.h"
+
+namespace ash {
+enum class AddUserSessionPolicy;
+}
+
+// Updates session state etc to ash via SessionControoler interface and handles

[James Cook, 2016/12/01 23:01:44]

nit: SessionController

[xiyuan, 2016/12/06 00:46:34]

Done.

+// session related calls from ash.
+// TODO(xiyuan): Update when UserSessionStateObserver is gone.
+class SessionControllerClient
+    : public ash::mojom::SessionControllerClient,
+      public user_manager::UserManager::UserSessionStateObserver,
+      public session_manager::SessionManagerObserver {
+ public:
+  SessionControllerClient();
+  ~SessionControllerClient() override;
+
+  static SessionControllerClient* Get();

[James Cook, 2016/12/01 23:01:44]

Is this used?

[xiyuan, 2016/12/06 00:46:34]

Right. No longer needed and removed.

+
+  // ash::mojom::SessionControllerClient:
+  void RequestLockScreen() override;
+  void SwitchActiveUser(const std::string& serialized_account_id) override;
+  void CycleActiveUser(bool next_user) override;
+
+  // user_manager::UserManager::UserSessionStateObserver:
+  void ActiveUserChanged(const user_manager::User* active_user) override;
+  void UserAddedToSession(const user_manager::User* added_user) override;
+
+  // session_manager::SessionManagerObserver:
+  void OnSessionStateChanged() override;
+
+  // TODO(xiyuan): Remove after SessionStateDelegateChromeOS is gone.
+  static bool CanLockScreen();
+  static bool ShouldLockScreenAutomatically();
+  static ash::AddUserSessionPolicy GetAddUserSessionPolicy();
+  static void DoLockScreen();
+  static void DoSwitchActiveUser(const AccountId& account_id);
+  static void DoCycleActiveUser(bool next_user);
+
+ private:
+  // Connects or reconnects to the |session_controller_| interface and set
+  // this object as its client.
+  void ConnectToSessionControllerAndSetClient();
+
+  // Handles errors on |session_controller_| interface.
+  void OnClientConnectionError();
+
+  // Sends session info to ash.
+  void SendSessionInfo();
+
+  // Binds to the client interface.
+  mojo::Binding<ash::mojom::SessionControllerClient> binding_;
+
+  // SessionController interface in ash.
+  ash::mojom::SessionControllerPtr session_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(SessionControllerClient);
+};
+
+#endif  // CHROME_BROWSER_UI_ASH_SESSION_CONTROLLER_CLIENT_H_