Invalidation trickles mega-patch

sync/notifier/ack_handler.cc

Index: sync/notifier/ack_handler.cc
diff --git a/sync/notifier/ack_handler.cc b/sync/notifier/ack_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3b31b2b7b2eec84a3da7b6a3eb3458f12d570a1c
--- /dev/null
+++ b/sync/notifier/ack_handler.cc
@@ -0,0 +1,15 @@
+// Copyright 2013 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.
+
+#include "sync/notifier/ack_handler.h"
+
+#include "sync/internal_api/public/base/invalidation.h"
+
+namespace syncer {
+
+AckHandler::AckHandler() {}
+
+AckHandler::~AckHandler() {}
+
+}  // namespace syncer