Add LwwRegister CRDT

blimp/helium/syncable_common.h

Index: blimp/helium/syncable_common.h
diff --git a/blimp/helium/syncable_common.h b/blimp/helium/syncable_common.h
new file mode 100644
index 0000000000000000000000000000000000000000..be5e547a4c25252a1b50be4bf60acac77c2a1138
--- /dev/null
+++ b/blimp/helium/syncable_common.h
@@ -0,0 +1,17 @@
+// Copyright 2016 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 BLIMP_HELIUM_SYNCABLE_COMMON_H_
+#define BLIMP_HELIUM_SYNCABLE_COMMON_H_
+
+namespace blimp {
+namespace helium {
+
+enum class Bias { Client, Engine };
+enum class RunningAs { Client, Engine };
+
+}  // namespace helium
+}  // namespace blimp
+
+#endif  // BLIMP_HELIUM_SYNCABLE_COMMON_H_