[Sync] Propagate XMPP auth errors to SyncNotifierObservers

sync/notifier/notifications_disabled_reason.h

+// 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.
+
+#ifndef SYNC_NOTIFIER_NOTIFICATIONS_DISABLED_REASON_H_
+#define SYNC_NOTIFIER_NOTIFICATIONS_DISABLED_REASON_H_
+#pragma once
+
+#include "jingle/notifier/listener/push_client_observer.h"
+
+namespace sync_notifier {
+
+enum NotificationsDisabledReason {
+  // There is an underlying transient problem (e.g., network- or
+  // XMPP-related).
+  TRANSIENT_NOTIFICATION_ERROR,
+  DEFAULT_NOTIFICATION_ERROR = TRANSIENT_NOTIFICATION_ERROR,
+  // Our credentials have been rejected.
+  NOTIFICATION_CREDENTIALS_REJECTED,
+  // No error (useful as a default value or to avoid keeping a
+  // separate bool for notifications enabled/disabled).
+  NO_NOTIFICATION_ERROR
+};
+
+const char* NotificationsDisabledReasonToString(
+    NotificationsDisabledReason reason);
+
+NotificationsDisabledReason FromNotifierReason(
+    notifier::NotificationsDisabledReason reason);
+
+}  // namespace sync_notifier
+
+#endif  // SYNC_NOTIFIER_NOTIFICATIONS_DISABLED_REASON_H_