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 2074 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 2773 matching lines @@
       ],
       'export_dependent_settings': [
         'in_memory_url_index_cache_proto',
       ],
       # This target exports a hard dependency because it includes generated
       # header files.
       'hard_dependency': 1,
     },
   ],
 }