Add a SigninAllowed policy.

chrome/browser/policy/configuration_policy_handler_list.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/policy/configuration_policy_handler_list.h"
 
 #include "base/prefs/pref_value_map.h"
 #include "base/stl_util.h"
 #include "base/values.h"
 #include "chrome/browser/policy/configuration_policy_handler.h"
@@ skipping 152 matching lines @@
     Value::TYPE_LIST },
   { key::kNotificationsBlockedForUrls,
     prefs::kManagedNotificationsBlockedForUrls,
     Value::TYPE_LIST },
   { key::kDefaultNotificationsSetting,
     prefs::kManagedDefaultNotificationsSetting,
     Value::TYPE_INTEGER },
   { key::kDefaultGeolocationSetting,
     prefs::kManagedDefaultGeolocationSetting,
     Value::TYPE_INTEGER },
+  { key::kSigninAllowed,
+    prefs::kSigninAllowed,
+    Value::TYPE_BOOLEAN },
   { key::kEnableOriginBoundCerts,
     prefs::kEnableOriginBoundCerts,
     Value::TYPE_BOOLEAN },
   { key::kDisableSSLRecordSplitting,
     prefs::kDisableSSLRecordSplitting,
     Value::TYPE_BOOLEAN },
   { key::kEnableOnlineRevocationChecks,
     prefs::kCertRevocationCheckingEnabled,
     Value::TYPE_BOOLEAN },
   { key::kAuthSchemes,
@@ skipping 266 matching lines @@
 }
 
 void ConfigurationPolicyHandlerList::PrepareForDisplaying(
     PolicyMap* policies) const {
   std::vector<ConfigurationPolicyHandler*>::const_iterator handler;
   for (handler = handlers_.begin(); handler != handlers_.end(); ++handler)
     (*handler)->PrepareForDisplaying(policies);
 }
 
 }  // namespace policy