[Sync] Add support for proxy types

chrome/browser/sync/sync_prefs.cc

Index: chrome/browser/sync/sync_prefs.cc
diff --git a/chrome/browser/sync/sync_prefs.cc b/chrome/browser/sync/sync_prefs.cc
index 3551bb470cfd48c4e2a3dbfd433939c6f8ac807f..42518ef17cc7ea97e0b29ef3cb7caf74c1be3c0b 100644
--- a/chrome/browser/sync/sync_prefs.cc
+++ b/chrome/browser/sync/sync_prefs.cc
@@ -69,6 +69,10 @@ void SyncPrefs::RegisterUserPrefs(PrefServiceSyncable* prefs) {
 
   syncer::ModelTypeSet user_types = syncer::UserTypes();
 
+  // Include virtual types as well, as they can be individually selected,
+  // although they don't have sync representations.
+  user_types.PutAll(syncer::VirtualTypes());

[tim (not reviewing), 2013/02/05 02:41:58]

If you happen to love ascii art, this wouldn't be a bad time to crack out a Venn
diagram for all these different sets of data types :)

+
   // Treat bookmarks specially.
   RegisterDataTypePreferredPref(prefs, syncer::BOOKMARKS, true);
   user_types.Remove(syncer::BOOKMARKS);