[Easy signin] Wire up userClick auth attempt to easy unlock app and back

chrome/chrome_browser.gypi

 # Copyright 2012 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': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 1435 matching lines @@
       'browser/metrics/extensions_metrics_provider.h',
       'browser/renderer_host/chrome_extension_message_filter.cc',
       'browser/renderer_host/chrome_extension_message_filter.h',
       'browser/safe_json_parser.cc',
       'browser/safe_json_parser.h',
       'browser/search/hotword_client.h',
       'browser/search/hotword_service.cc',
       'browser/search/hotword_service.h',
       'browser/search/hotword_service_factory.cc',
       'browser/search/hotword_service_factory.h',
+      'browser/signin/easy_unlock_auth_attempt.cc',
+      'browser/signin/easy_unlock_auth_attempt.h',
       'browser/signin/easy_unlock_screenlock_state_handler.cc',
       'browser/signin/easy_unlock_screenlock_state_handler.h',
       'browser/signin/easy_unlock_service.cc',
       'browser/signin/easy_unlock_service.h',
       'browser/signin/easy_unlock_service_factory.cc',
       'browser/signin/easy_unlock_service_factory.h',
       'browser/signin/easy_unlock_service_regular.cc',
       'browser/signin/easy_unlock_service_regular.h',
       'browser/signin/easy_unlock_service_signin_chromeos.cc',
       'browser/signin/easy_unlock_service_signin_chromeos.h',
@@ skipping 2115 matching lines @@
           'variables': {
             'proto_in_dir': 'browser/sync_file_system/drive_backend',
             'proto_out_dir': 'chrome/browser/sync_file_system/drive_backend',
           },
           'includes': [ '../build/protoc.gypi' ]
         },
       ],
     },],
   ],
 }