Sync MDP: reimplement value conversions ontop of visitors

components/sync/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/buildflag_header.gni")
 import("//build/config/features.gni")
 import("//components/sync/protocol/protocol_sources.gni")
 import("//testing/test.gni")
 
 static_library("sync") {
@@ skipping 454 matching lines @@
     "engine_impl/worker_entity_tracker.h",
     "js/js_backend.h",
     "js/js_controller.h",
     "js/js_event_details.cc",
     "js/js_event_details.h",
     "js/js_event_handler.h",
     "js/sync_js_controller.cc",
     "js/sync_js_controller.h",
     "protocol/proto_enum_conversions.cc",
     "protocol/proto_enum_conversions.h",
+    "protocol/proto_old_value_conversions.cc",
+    "protocol/proto_old_value_conversions.h",
     "protocol/proto_value_conversions.cc",
     "protocol/proto_value_conversions.h",
     "protocol/sync_protocol_error.cc",
     "protocol/sync_protocol_error.h",
     "syncable/dir_open_result.h",
     "syncable/directory.cc",
     "syncable/directory.h",
     "syncable/directory_backing_store.cc",
     "syncable/directory_backing_store.h",
     "syncable/directory_change_delegate.h",
@@ skipping 390 matching lines @@
     "engine_impl/get_updates_processor_unittest.cc",
     "engine_impl/model_type_registry_unittest.cc",
     "engine_impl/model_type_worker_unittest.cc",
     "engine_impl/sync_scheduler_unittest.cc",
     "engine_impl/syncer_proto_util_unittest.cc",
     "engine_impl/syncer_unittest.cc",
     "engine_impl/syncer_util_unittest.cc",
     "engine_impl/worker_entity_tracker_unittest.cc",
     "js/js_event_details_unittest.cc",
     "js/sync_js_controller_unittest.cc",
+    "protocol/proto_compare_value_conversions_unittest.cc",
     "protocol/proto_enum_conversions_unittest.cc",
+    "protocol/proto_unittest_serialized_data.cc",
+    "protocol/proto_unittest_serialized_data.h",
     "protocol/proto_value_conversions_unittest.cc",
     "syncable/directory_backing_store_unittest.cc",
     "syncable/directory_unittest.cc",
     "syncable/directory_unittest.h",
     "syncable/entry_kernel_unittest.cc",
     "syncable/model_type_unittest.cc",
     "syncable/nigori_util_unittest.cc",
     "syncable/parent_child_index_unittest.cc",
     "syncable/syncable_enum_conversions_unittest.cc",
     "syncable/syncable_id_unittest.cc",
@@ skipping 204 matching lines @@
     deps = [
       ":fake_server_jni",
       ":sync",
       ":test_support_sync_fake_server",
       "//base",
       "//testing/gtest",
       "//url:url",
     ]
   }
 }