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 3441f63f925adb8c50b79e2297f2e8b259f00e48..e8d764bc51787eebefa02fd6ec518dc75f0df9e0 100644
--- a/chrome/common/pref_names.cc
+++ b/chrome/common/pref_names.cc
@@ -1261,6 +1261,11 @@ const char kSyncSuppressStart[] = "sync.suppress_start";
 // migrated to the new model.
 const char kAutofillProfileMigrated[] = "sync.autofill_migrated";
 
+// String representation 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";