Access to Chrome via the System Tray should go through the User Manager.

chrome/browser/ui/webui/signin/user_manager_screen_handler.h

 // Copyright 2013 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_WEBUI_SIGNIN_USER_MANAGER_SCREEN_HANDLER_H_
 #define CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_MANAGER_SCREEN_HANDLER_H_
 
 #include <map>
 #include <string>
 
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
+#include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_metrics.h"
 #include "chrome/browser/signin/screenlock_bridge.h"
 #include "chrome/browser/ui/host_desktop.h"
 #include "content/public/browser/web_ui_message_handler.h"
 #include "google_apis/gaia/gaia_auth_consumer.h"
 
 class GaiaAuthFetcher;
 
 namespace base {
 class DictionaryValue;
@@ skipping 46 matching lines @@
   virtual void OnClientLoginFailure(const GoogleServiceAuthError& error)
       OVERRIDE;
 
   // Sends user list to account chooser.
   void SendUserList();
 
   // Pass success/failure information back to the web page.
   void ReportAuthenticationResult(bool success,
                                   ProfileMetrics::ProfileAuth metric);
 
+  // Perform cleanup once the profile and browser are open.
+  void OnSwitchToProfileComplete(Profile* profile,
+                                 Profile::CreateStatus profile_create_status);
+
   // Observes the ProfileInfoCache and gets notified when a profile has been
   // modified, so that the displayed user pods can be updated.
   scoped_ptr<ProfileUpdateObserver> profileInfoCacheObserver_;
 
   // The host desktop type this user manager belongs to.
   chrome::HostDesktopType desktop_type_;
 
   // Authenticator used when local-auth fails.
   scoped_ptr<GaiaAuthFetcher> client_login_;
 
   // The index of the profile currently being authenticated.
   size_t authenticating_profile_index_;
 
   // Login password, held during on-line auth for saving later if correct.
   std::string password_attempt_;
 
+  // URL hash, used to key post-profile actions if present.
+  base::string16 url_hash_;
+
   typedef std::map<std::string, ScreenlockBridge::LockHandler::AuthType>
       UserAuthTypeMap;
   UserAuthTypeMap user_auth_type_map_;
 
   DISALLOW_COPY_AND_ASSIGN(UserManagerScreenHandler);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_SIGNIN_USER_MANAGER_SCREEN_HANDLER_H_