Implemented system tray UI for new account management.

ash/system/tray/system_tray_delegate.h

 // Copyright (c) 2012 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 ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 93 matching lines @@
   std::string id;
   base::string16 name;
   base::string16 medium_name;
   base::string16 short_name;
 };
 
 typedef std::vector<IMEInfo> IMEInfoList;
 
 class VolumeControlDelegate;
 
+namespace tray {
+class UserAccountsDelegate;
+}  // namespace tray
+
 class ASH_EXPORT SystemTrayDelegate {
  public:
   virtual ~SystemTrayDelegate() {}
 
   // Called after SystemTray has been instantiated.
   virtual void Initialize() = 0;
 
   // Called before SystemTray is destroyed.
   virtual void Shutdown() = 0;
 
@@ skipping 202 matching lines @@
   // to be switched to the new user.
   // Note: This will happen after SessionStateObserver::ActiveUserChanged fires.
   virtual void ActiveUserWasChanged() = 0;
 
   // Returns true when |network| is behind captive portal.
   virtual bool IsNetworkBehindCaptivePortal(
       const std::string& service_path) const = 0;
 
   // Returns true when the Search key is configured to be treated as Caps Lock.
   virtual bool IsSearchKeyMappedToCapsLock() = 0;
+
+  // Returns accounts delegate for given user.
+  virtual tray::UserAccountsDelegate* GetUserAccountsDelegate(
+      const std::string& user_id) = 0;
 };
+
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_DELEGATE_H_