Simulate transient error and verify exponential backoff.

chrome/chrome_browser.gypi

 # Copyright (c) 2011 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',
       'type': 'static_library',
       'dependencies': [
@@ skipping 2123 matching lines @@
         'browser/sync/backend_migrator.cc',
         'browser/sync/backend_migrator.h',
         'browser/sync/profile_sync_factory.h',
         'browser/sync/profile_sync_factory_impl.cc',
         'browser/sync/profile_sync_factory_impl.h',
         'browser/sync/profile_sync_service.cc',
         'browser/sync/profile_sync_service.h',
         'browser/sync/profile_sync_service_harness.cc',
         'browser/sync/profile_sync_service_harness.h',
         'browser/sync/profile_sync_service_observer.h',
+        'browser/sync/retry_verifier.cc',
+        'browser/sync/retry_verifier.h',
         'browser/sync/signin_manager.cc',
         'browser/sync/signin_manager.h',
         'browser/sync/sync_setup_flow.cc',
         'browser/sync/sync_setup_flow.h',
         'browser/sync/sync_setup_flow_handler.h',
         'browser/sync/sync_setup_wizard.cc',
         'browser/sync/sync_setup_wizard.h',
         'browser/sync/sync_ui_util.cc',
         'browser/sync/sync_ui_util.h',
         'browser/sync/sync_ui_util_mac.h',
@@ skipping 2849 matching lines @@
               # weak imports in dependents, who still must #include
               # closure_blocks_leopard_compat.h to get weak imports.
               'type': 'none',
             }],
           ],
         },
       ],
     }],
   ],
 }