Add LwwRegister CRDT

blimp/net/BUILD.gn

Index: blimp/net/BUILD.gn
diff --git a/blimp/net/BUILD.gn b/blimp/net/BUILD.gn
index e56982e880e34bd0f9334854cbc8cf1241de7595..c3616a08ee18ab9d51a343a94868de7fa4866e2e 100644
--- a/blimp/net/BUILD.gn
+++ b/blimp/net/BUILD.gn
@@ -101,7 +101,11 @@ source_set("helium") {
     "helium/helium_sync_manager.cc",
     "helium/helium_sync_manager.h",
     "helium/helium_transport.h",
+    "helium/lww_register.h",
     "helium/syncable.h",
+    "helium/syncable_common.h",
+    "helium/syncable_primitive_serializer.cc",
+    "helium/syncable_primitive_serializer.h",
     "helium/version_vector.cc",
     "helium/version_vector.h",
     "helium/version_vector_generator.h",
@@ -170,6 +174,8 @@ source_set("unit_tests") {
     "engine_authentication_handler_unittest.cc",
     "engine_connection_manager_unittest.cc",
     "helium/helium_result_unittest.cc",
+    "helium/lww_register_unittest.cc",
+    "helium/syncable_primitive_serializer_unittest.cc",
     "helium/syncable_unittest.cc",
     "helium/version_vector_generator_unittest.cc",
     "helium/version_vector_unittest.cc",