Adding notifications for new sync types.

chrome/common/pref_names.cc

Index: chrome/common/pref_names.cc
diff --git a/chrome/common/pref_names.cc b/chrome/common/pref_names.cc
index c98c20439dedf6d34477008a8c4a86053ce66f54..8c69cd9752383930ffa89a707a8ef2a79f31a849 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1272,6 +1272,10 @@ const char kSyncSuppressStart[] = "sync.suppress_start";
 // migrated to the new model.
 const char kAutofillProfileMigrated[] = "sync.autofill_migrated";
 
+// List of the currently acknowledged set of sync types, used to figure out
+// if a new sync type has rolled out so we can notify the user.
+const char kAcknowledgedSyncTypes[] = "sync.acknowledged_types";
+
 // A string that can be used to restore sync encryption infrastructure on
 // startup so that the user doesn't need to provide credentials on each start.
 const char kEncryptionBootstrapToken[] = "sync.encryption_bootstrap_token";