[Sync] Add support for proxy types

chrome/browser/sync/sync_prefs.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/sync/sync_prefs.h"
 
 #include "base/logging.h"
 #include "base/prefs/public/pref_member.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
@@ skipping 51 matching lines @@
 #else
   bool enable_by_default = !prefs->HasPrefPath(prefs::kSyncHasSetupCompleted);
 #endif
 
   prefs->RegisterBooleanPref(prefs::kSyncKeepEverythingSynced,
                              enable_by_default,
                              PrefServiceSyncable::UNSYNCABLE_PREF);
 
   syncer::ModelTypeSet user_types = syncer::UserTypes();
 
+  // Include proxy types as well, as they can be individually selected,
+  // although they don't have sync representations.
+  user_types.PutAll(syncer::ProxyTypes());
+
   // Treat bookmarks specially.
   RegisterDataTypePreferredPref(prefs, syncer::BOOKMARKS, true);
   user_types.Remove(syncer::BOOKMARKS);
 
   for (syncer::ModelTypeSet::Iterator it = user_types.First();
        it.Good(); it.Inc()) {
     RegisterDataTypePreferredPref(prefs, it.Get(), enable_by_default);
   }
 
   prefs->RegisterBooleanPref(prefs::kSyncManaged,
@@ skipping 355 matching lines @@
     if (types.Has(i->first))
       types_with_groups.PutAll(i->second);
     else
       types_with_groups.RemoveAll(i->second);
   }
   types_with_groups.RetainAll(registered_types);
   return types_with_groups;
 }
 
 }  // namespace browser_sync