Do not reload account picker when device-local account policy changes

chrome/browser/chromeos/login/screens/chrome_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_CHROME_USER_SELECTION_SCREEN_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_CHROME_USER_SELECTION_SCREEN_H_
+
+#include <map>
+#include <string>
+
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/chromeos/login/screens/user_selection_screen.h"
+#include "chrome/browser/chromeos/policy/device_local_account_policy_service.h"
+
+namespace chromeos {
+
+class ChromeUserSelectionScreen
+    : public UserSelectionScreen,
+      public policy::DeviceLocalAccountPolicyService::Observer {
+ public:
+  ChromeUserSelectionScreen();
+  virtual ~ChromeUserSelectionScreen();
+
+  // UserSelectionScreen:
+  virtual void Init(const user_manager::UserList& users,
+                    bool show_guest) OVERRIDE;
+  virtual void SendUserList() OVERRIDE;
+
+  // policy::DeviceLocalAccountPolicyService::Observer:
+  virtual void OnPolicyUpdated(const std::string& user_id) OVERRIDE;
+  virtual void OnDeviceLocalAccountsChanged() OVERRIDE;
+
+ private:
+  // Check whether the display name set by policy for a public session has
+  // changed and if so, notify the UI.
+  void CheckForPublicSessionDisplayNameChange(
+      policy::DeviceLocalAccountPolicyBroker* broker);
+
+  // Notify the UI that the display name for a public session has changed,
+  // taking the display name from the |User| owned by |UserManager|.
+  void SetPublicSessionDisplayName(const std::string& user_id);
+
+  bool handler_initialized_;
+
+  policy::DeviceLocalAccountPolicyService* device_local_account_policy_service_;
+
+  // Map from public session user IDs to their display names set by policy.
+  typedef std::map<std::string, std::string> DisplayNamesMap;
+  DisplayNamesMap public_session_display_names_;
+
+  base::WeakPtrFactory<ChromeUserSelectionScreen> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeUserSelectionScreen);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_CHROME_USER_SELECTION_SCREEN_H_