[Sync] Split fake ModelTypeService impl out of SMTP tests.

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 698 matching lines @@
     "api/fake_model_type_change_processor.cc",
     "api/fake_model_type_change_processor.h",
     "api/fake_model_type_service.cc",
     "api/fake_model_type_service.h",
     "api/fake_sync_change_processor.cc",
     "api/fake_sync_change_processor.h",
     "api/fake_syncable_service.cc",
     "api/fake_syncable_service.h",
     "api/mock_model_type_store.cc",
     "api/mock_model_type_store.h",
+    "api/stub_model_type_service.cc",
+    "api/stub_model_type_service.h",
     "api/sync_change_processor_wrapper_for_test.cc",
     "api/sync_change_processor_wrapper_for_test.h",
     "api/sync_error_factory_mock.cc",
     "api/sync_error_factory_mock.h",
   ]
 
   defines = [ "SYNC_TEST" ]
 
   public_deps = [
     "//base",
     "//components/sync",
     "//testing/gmock",
+    "//testing/gtest",
   ]
 }
 
 static_library("test_support_sync_driver") {
   testonly = true
   sources = [
     "device_info/local_device_info_provider_mock.cc",
     "device_info/local_device_info_provider_mock.h",
     "driver/change_processor_mock.cc",
     "driver/change_processor_mock.h",
@@ skipping 354 matching lines @@
     deps = [
       ":fake_server_jni",
       ":sync",
       ":test_support_sync_fake_server",
       "//base",
       "//testing/gtest",
       "//url:url",
     ]
   }
 }