[Chromoting] Add missing file to webapp's GN build.

remoting/webapp/files.gni

 # Copyright 2015 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.
 
-# Keep in sync with remoting/remoting_webapp_files.gypi.
+# `7MM"""Mq.                       `7MM
+#   MM   `MM.                        MM
+#   MM   ,M9  .gP"Ya   ,6"Yb.   ,M""bMM  `7MMpMMMb.pMMMb.  .gP"Ya
+#   MMmmdM9  ,M'   Yb 8)   MM ,AP    MM    MM    MM    MM ,M'   Yb
+#   MM  YM.  8M""""""  ,pm9MM 8MI    MM    MM    MM    MM 8M""""""
+#   MM   `Mb.YM.    , 8M   MM `Mb    MM    MM    MM    MM YM.    ,
+# .JMML. .JMM.`Mbmmd' `Moo9^Yo.`Wbmd"MML..JMML  JMML  JMML.`Mbmmd'
+#
+# Please keep this file in sync with remoting/remoting_webapp_files.gypi.
 
 # Jscompile proto files.
 # These provide type information for jscompile.
 remoting_webapp_js_proto_files = [
   "js_proto/chrome_proto.js",
   "js_proto/chrome_cast_proto.js",
   "js_proto/chrome_event_proto.js",
   "js_proto/dom_proto.js",
   "js_proto/remoting_proto.js",
 ]
@@ skipping 193 matching lines @@
   "crd/js/host_install_dialog.js",
   "crd/js/host_installer.js",
   "crd/js/it2me_host_facade.js",
   "crd/js/paired_client_manager.js",
 ]
 
 # Files for displaying (in the client) info about available hosts.
 remoting_webapp_js_host_display_files = [
   "crd/js/host_list.js",
   "crd/js/host_list_api.js",
+  "crd/js/host_list_api_gcd_impl.js",
   "crd/js/host_list_api_impl.js",
   "crd/js/host_table_entry.js",
   "crd/js/local_host_section.js",
 ]
 
 # Logging and stats JavaScript files.
 remoting_webapp_js_logging_files = [
   "crd/js/format_iq.js",
   "crd/js/log_to_server.js",
   "crd/js/server_log_entry.js",
@@ skipping 241 matching lines @@
 # Files that contain localizable strings.
 desktop_remoting_webapp_localizable_files = [
   "webapp/crd/manifest.json.jinja2",
   "<(remoting_webapp_template_background)",
   "<(remoting_webapp_template_main)",
   "<(remoting_webapp_template_message_window)",
   "<(remoting_webapp_template_wcs_sandbox)",
   "<@(remoting_webapp_template_files)",
   "<@(remoting_webapp_crd_js_files)",
 ]