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

chrome/browser/profiles/profile.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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_H_
 
 #include <string>
@@ skipping 90 matching lines @@
     // Profile services were not created due to a remote error (e.g., network
     // down during limited-user registration).
     CREATE_STATUS_REMOTE_FAIL,
     // Profile created but before initializing extensions and promo resources.
     CREATE_STATUS_CREATED,
     // Profile is created, extensions and promo resources are initialized.
     CREATE_STATUS_INITIALIZED,
     // Profile creation (supervised-user registration, generally) was canceled
     // by the user.
     CREATE_STATUS_CANCELED,
+    // Profile already existed and is completely initialized.
+    CREATE_STATUS_ALREADY_CREATED,
     MAX_CREATE_STATUS  // For histogram display.
   };
 
   enum CreateMode {
     CREATE_MODE_SYNCHRONOUS,
     CREATE_MODE_ASYNCHRONOUS
   };
 
   enum ExitType {
     // A normal shutdown. The user clicked exit/closed last window of the
@@ skipping 291 matching lines @@
 struct hash<Profile*> {
   std::size_t operator()(Profile* const& p) const {
     return reinterpret_cast<std::size_t>(p);
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 #endif
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_H_