Added mock_xhr module w/ unit tests.

remoting/remoting_webapp_files.gypi

 # 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.
 
 {
   'variables': {
 
     # Jscompile proto files.
     # These provide type information for jscompile.
     'remoting_webapp_js_proto_files': [
@@ skipping 57 matching lines @@
       'webapp/base/js/base_unittest.js',
       'webapp/base/js/base_event_hook_unittest.js',
       'webapp/base/js/base_inherits_unittest.js',
       'webapp/base/js/ipc_unittest.js',
       'webapp/crd/js/apps_v2_migration_unittest.js',
       'webapp/crd/js/desktop_viewport_unittest.js',
       'webapp/crd/js/dns_blackhole_checker_unittest.js',
       'webapp/crd/js/error_unittest.js',
       'webapp/crd/js/fallback_signal_strategy_unittest.js',
       'webapp/crd/js/gcd_client_unittest.js',
+      'webapp/crd/js/gcd_client_with_mock_xhr_unittest.js',
       'webapp/crd/js/host_table_entry_unittest.js',
       'webapp/crd/js/identity_unittest.js',
       'webapp/crd/js/l10n_unittest.js',
       'webapp/crd/js/menu_button_unittest.js',
+      'webapp/crd/js/mock_xhr_unittest.js',
       'webapp/crd/js/typecheck_unittest.js',
       'webapp/crd/js/xhr_unittest.js',
       'webapp/crd/js/xmpp_connection_unittest.js',
       'webapp/crd/js/xmpp_login_handler_unittest.js',
       'webapp/crd/js/xmpp_stream_parser_unittest.js',
     ],
     'remoting_webapp_unittests_js_mock_files': [
       # Some proto files can be repurposed as simple mocks for the unittests.
       # Note that some defs in chrome_proto are overwritten by chrome_mocks.
       'webapp/crd/js/mock_signal_strategy.js',
       'webapp/js_proto/chrome_proto.js',
       'webapp/js_proto/chrome_mocks.js',
       'webapp/unittests/sinon_helpers.js',
+      'webapp/crd/js/mock_xhr.js',
     ],
     # Prototypes for objects that are not mocked.
     'remoting_webapp_unittests_js_proto_files': [
       'webapp/js_proto/chrome_cast_proto.js',
       'webapp/js_proto/dom_proto.js',
       'webapp/js_proto/remoting_proto.js',
       'webapp/js_proto/qunit_proto.js',
       'webapp/js_proto/sinon_proto.js',
     ],
     'remoting_webapp_unittests_all_js_files': [
@@ skipping 357 matching lines @@
       '<(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)',
     ],
 
   },
 }