[Signin] Factor out a helper class to load a continue URL once Sync is configured.

chrome/chrome_browser_ui.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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1594 matching lines @@
         'browser/ui/sync/browser_synced_window_delegate.h',
         'browser/ui/sync/browser_synced_window_delegate.cc',
         'browser/ui/sync/inline_login_dialog.cc',
         'browser/ui/sync/inline_login_dialog.h',
         'browser/ui/sync/one_click_signin_bubble_delegate.h',
         'browser/ui/sync/one_click_signin_bubble_links_delegate.cc',
         'browser/ui/sync/one_click_signin_bubble_links_delegate.h',
         'browser/ui/sync/one_click_signin_helper.cc',
         'browser/ui/sync/one_click_signin_helper.h',
         'browser/ui/sync/one_click_signin_histogram.h',
+        'browser/ui/sync/one_click_signin_sync_observer.cc',
+        'browser/ui/sync/one_click_signin_sync_observer.h',
         'browser/ui/sync/one_click_signin_sync_starter.cc',
         'browser/ui/sync/one_click_signin_sync_starter.h',
         'browser/ui/sync/profile_signin_confirmation_helper.cc',
         'browser/ui/sync/profile_signin_confirmation_helper.h',
         'browser/ui/sync/signin_histogram.h',
         'browser/ui/sync/sync_promo_ui.cc',
         'browser/ui/sync/sync_promo_ui.h',
         'browser/ui/sync/tab_contents_synced_tab_delegate.cc',
         'browser/ui/sync/tab_contents_synced_tab_delegate.h',
         'browser/ui/tab_contents/chrome_web_contents_view_delegate.h',
@@ skipping 1813 matching lines @@
             'browser/ui/webui/local_discovery/local_discovery_ui.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui.h',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.cc',
             'browser/ui/webui/local_discovery/local_discovery_ui_handler.h',
           ],
         }],
       ],
     },
   ],
 }