Enable the mojo-based serial API in the renderer behind a flag.

extensions/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("//tools/grit/grit_rule.gni")
 import("//tools/grit/repack.gni")
 
 # GYP version: extensions/extensions_resources.gyp:extensions_resources
 group("extensions_resources") {
   deps = [
@@ skipping 76 matching lines @@
     "common/value_builder.cc",
     "common/value_builder.h",
     "renderer/test_extensions_renderer_client.cc",
     "renderer/test_extensions_renderer_client.h",
     "test/extension_test_message_listener.cc",
     "test/extension_test_message_listener.h",
     "test/test_extensions_client.cc",
     "test/test_extensions_client.h",
     "test/test_permission_message_provider.cc",
     "test/test_permission_message_provider.h",
+    "test/test_service_registration_manager.cc",
+    "test/test_service_registration_manager.h",
    ]
 
   deps = [
     ":extensions_resources",
     "//base",
     "//content/public/browser",
     "//content/public/common",
     "//content/test:test_support",
     "//extensions/browser",
     "//extensions/common",
@@ skipping 163 matching lines @@
 
   if (is_win) {
     deps += [
       "//base/allocator",
     ]
   }
 }
 }
 
 }