Use multi-profile mount point by default after browser crash and in Guest session.

chrome/browser/chromeos/profiles/profile_helper.h

 // Copyright (c) 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_CHROMEOS_PROFILES_PROFILE_HELPER_H_
 #define CHROME_BROWSER_CHROMEOS_PROFILES_PROFILE_HELPER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 45 matching lines @@
   // signin Profile.
   static bool IsSigninProfile(Profile* profile);
 
   // Initialize a bunch of services that are tied to a browser profile.
   // TODO(dzhioev): Investigate whether or not this method is needed.
   void ProfileStartup(Profile* profile, bool process_startup);
 
   // Returns active user profile dir in a format [u-$hash].
   base::FilePath GetActiveUserProfileDir();
 
+  // Returns user profile dir in a format [u-user_id_hash].
+  base::FilePath GetUserProfileDir(const std::string& user_id_hash);

[Dmitry Polukhin, 2013/09/18 15:46:06]

I made similar function UserManager::GetUserProfileDir, I think we need to use
it and remove Chrome OS specific code from Profiles.

[Nikita (slow), 2013/09/18 16:22:55]

I don't see this function in user_manager.h / user_manager_impl.h
 
You mean ProfileManager? Yes, it needs to be cleaned up but looking at
profile_manager.cc I see that UserManager is used only once:

if (chromeos::UserManager::Get()->IsLoggedInAsGuest())

While ProfileHelper was decided to be a way to capture Chrome OS specific code
paths that need to be executed in ProfileManager. So I would prefer to keep to
that approach.

[Dmitry Polukhin, 2013/09/18 16:48:43]

As we discussed offline UserManagerImpl::GetUserProfileDir needs to be updated
too.

[Nikita (slow), 2013/09/18 18:04:37]

Done.

+
   // Should called once after UserManager instance has been created.
   void Initialize();
 
   // Returns hash for active user ID which is used to identify that user profile
   // on Chrome OS.
   std::string active_user_id_hash() { return active_user_id_hash_; }
 
   // Clears site data (cookies, history, etc) for signin profile.
   // Callback can be empty. Not thread-safe.
   void ClearSigninProfile(const base::Closure& on_clear_callback);
@@ skipping 20 matching lines @@
 
   // List of callbacks called after signin profile clearance.
   std::vector<base::Closure> on_clear_callbacks_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileHelper);
 };
 
 } // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_PROFILES_PROFILE_HELPER_H_