[Sync] Enable adding notifier observers from ProfileSyncService

chrome/browser/sync/test_profile_sync_service.cc

Index: chrome/browser/sync/test_profile_sync_service.cc
diff --git a/chrome/browser/sync/test_profile_sync_service.cc b/chrome/browser/sync/test_profile_sync_service.cc
index c98ffc378064301be3b89437e9bdca539ec034a2..1e4589ce87f1c50f0e39d256d3618aa3228b5601 100644
--- a/chrome/browser/sync/test_profile_sync_service.cc
+++ b/chrome/browser/sync/test_profile_sync_service.cc
@@ -145,6 +145,21 @@ void SyncBackendHostForProfileSyncTest::SetInitialSyncEndedForAllTypes() {
   }
 }
 
+void SyncBackendHostForProfileSyncTest::EmitOnNotificationsEnabled() {
+  frontend()->OnNotificationsEnabled();
+}
+
+void SyncBackendHostForProfileSyncTest::EmitOnNotificationsDisabled(
+    syncer::NotificationsDisabledReason reason) {
+  frontend()->OnNotificationsDisabled(reason);
+}
+
+void SyncBackendHostForProfileSyncTest::EmitOnIncomingNotification(
+    const syncer::ObjectIdPayloadMap& id_payloads,
+    const syncer::IncomingNotificationSource source) {
+  frontend()->OnIncomingNotification(id_payloads, source);
+}
+
 }  // namespace browser_sync
 
 syncer::TestIdFactory* TestProfileSyncService::id_factory() {