Add some remoting targets to GN build.

google_apis/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/config/features.gni")
 
 declare_args() {
   # You can set the variable 'use_official_google_api_keys' to true
   # to use the Google-internal file containing official API keys
   # for Google Chrome even in a developer build.  Setting this
@@ skipping 59 matching lines @@
   if (google_default_client_id != "") {
     defines += [ "GOOGLE_DEFAULT_CLIENT_ID=$google_default_client_id" ]
   }
   if (google_default_client_secret != "") {
     defines += [ "GOOGLE_DEFAULT_CLIENT_SECRET=$google_default_client_secret" ]
   }
 }
 
 source_set("google_apis") {
   sources = [
+    "gaia/account_tracker.cc",
+    "gaia/account_tracker.h",
     "gaia/gaia_auth_consumer.cc",
     "gaia/gaia_auth_consumer.h",
     "gaia/gaia_auth_fetcher.cc",
     "gaia/gaia_auth_fetcher.h",
     "gaia/gaia_auth_util.cc",
     "gaia/gaia_auth_util.h",
     "gaia/gaia_constants.cc",
     "gaia/gaia_constants.h",
     "gaia/gaia_oauth_client.cc",
     "gaia/gaia_oauth_client.h",
@@ skipping 143 matching lines @@
       "drive/drive_api_url_generator_unittest.cc",
       "drive/gdata_wapi_parser_unittest.cc",
       "drive/gdata_wapi_requests_unittest.cc",
       "drive/gdata_wapi_url_generator_unittest.cc",
       "drive/request_sender_unittest.cc",
       "drive/request_util_unittest.cc",
       "drive/time_util_unittest.cc",
     ]
   }
 }