Add a new method to the ProfileInfoCacheObserver for signin status changes.

chrome/browser/profiles/profile_info_cache.cc

 // 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.
 
 #include "chrome/browser/profiles/profile_info_cache.h"
 
 #include "base/bind.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
 #include "base/i18n/case_conversion.h"
@@ skipping 689 matching lines @@
 void ProfileInfoCache::SetProfileSigninRequiredAtIndex(size_t index,
                                                        bool value) {
   if (value == ProfileIsSigninRequiredAtIndex(index))
     return;
 
   scoped_ptr<base::DictionaryValue> info(
       GetInfoForProfileAtIndex(index)->DeepCopy());
   info->SetBoolean(kSigninRequiredKey, value);
   // This takes ownership of |info|.
   SetInfoForProfileAtIndex(index, info.release());
+
+  base::FilePath profile_path = GetPathOfProfileAtIndex(index);
+  FOR_EACH_OBSERVER(ProfileInfoCacheObserver,
+                    observer_list_,
+                    OnProfileSigninRequiredChanged(profile_path));
 }
 
 void ProfileInfoCache::SetProfileIsEphemeralAtIndex(size_t index, bool value) {
   if (value == ProfileIsEphemeralAtIndex(index))
     return;
 
   scoped_ptr<base::DictionaryValue> info(
       GetInfoForProfileAtIndex(index)->DeepCopy());
   info->SetBoolean(kProfileIsEphemeral, value);
   // This takes ownership of |info|.
@@ skipping 214 matching lines @@
     info->GetString(kNameKey, &name);
     names.push_back(name);
   }
   return names;
 }
 
 // static
 void ProfileInfoCache::RegisterPrefs(PrefRegistrySimple* registry) {
   registry->RegisterDictionaryPref(prefs::kProfileInfoCache);
 }