Add LwwRegister CRDT

blimp/helium/BUILD.gn

Index: blimp/helium/BUILD.gn
diff --git a/blimp/helium/BUILD.gn b/blimp/helium/BUILD.gn
index e25c41ad0cfa59d093efa6c4966bde80a1547b68..5e8442cd794099be100a9ee02b95520f3c5c6a59 100644
--- a/blimp/helium/BUILD.gn
+++ b/blimp/helium/BUILD.gn
@@ -6,12 +6,16 @@ component("helium") {
   output_name = "helium"
   sources = [
     "errors.h",
+    "lww_register.h",
     "result.cc",
     "result.h",
     "stream.h",
     "sync_manager.cc",
     "sync_manager.h",
     "syncable.h",
+    "syncable_common.h",
+    "syncable_primitive_serializer.cc",
+    "syncable_primitive_serializer.h",
     "transport.h",
     "version_vector.cc",
     "version_vector.h",
@@ -42,7 +46,9 @@ source_set("unit_tests") {
   testonly = true
 
   sources = [
+    "lww_register_unittest.cc",
     "result_unittest.cc",
+    "syncable_primitive_serializer_unittest.cc",
     "syncable_unittest.cc",
     "version_vector_generator_unittest.cc",
     "version_vector_unittest.cc",