The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/148e5e3c9eb4a821b39913b2673b6842adc4b7bc

commit 148e5e3c9eb4a821b39913b2673b6842adc4b7bc
Author: skym <skym@chromium.org>
Date: Thu Jun 29 20:13:27 2017

[Sync] Sanity test for UserEvents.

BUG= 728753 

Review-Url: https://codereview.chromium.org/2948303002
Cr-Commit-Position: refs/heads/master@{#483460}

[modify] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/chrome/browser/sync/test/integration/migration_test.cc
[add] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/chrome/browser/sync/test/integration/single_client_user_events_sync_test.cc
[modify] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/chrome/test/BUILD.gn
[modify] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/components/sync/test/fake_server/fake_server.cc
[modify] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/components/sync/test/fake_server/unique_client_entity.cc
[modify] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/components/sync/test/fake_server/unique_client_entity.h
[modify] https://crrev.com/148e5e3c9eb4a821b39913b2673b6842adc4b7bc/testing/variations/fieldtrial_testing_config.json

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0ff047cc8c4e9b8bcadf0ab951781f253afc3a12

commit 0ff047cc8c4e9b8bcadf0ab951781f253afc3a12
Author: skym <skym@chromium.org>
Date: Fri Jul 07 15:46:47 2017

[Sync] Added integ tests to verify UserEvents retry on TRANSIENT_ERROR.

BUG= 728753 

Review-Url: https://codereview.chromium.org/2973833002
Cr-Commit-Position: refs/heads/master@{#484939}

[modify] https://crrev.com/0ff047cc8c4e9b8bcadf0ab951781f253afc3a12/chrome/browser/sync/test/integration/single_client_user_events_sync_test.cc
[modify] https://crrev.com/0ff047cc8c4e9b8bcadf0ab951781f253afc3a12/components/sync/test/fake_server/fake_server.cc
[modify] https://crrev.com/0ff047cc8c4e9b8bcadf0ab951781f253afc3a12/components/sync/test/fake_server/fake_server.h

Need to add tests that verify we can return TRANSIENT_ERROR for USER_EVENTS, but other types are still committing successfully while USER_EVENTS is in backoff. See  issue 750142 .

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dec5aed76404ee950893480c4ad3d27a1cd6f4e1

commit dec5aed76404ee950893480c4ad3d27a1cd6f4e1
Author: Sky Malice <skym@chromium.org>
Date: Thu Aug 10 20:23:06 2017

[Sync] Add unit/integ tests for suppressed UserEvents.

This is in part a follow up CL to add tests for
https://chromium-review.googlesource.com/c/610343/

Bug:  728753 
Change-Id: Iaba4225389e3005f0df9b9ab37b9005b392d4328
Reviewed-on: https://chromium-review.googlesource.com/610620
Reviewed-by: Patrick Noland <pnoland@google.com>
Commit-Queue: Sky Malice <skym@chromium.org>
Cr-Commit-Position: refs/heads/master@{#493507}
[modify] https://crrev.com/dec5aed76404ee950893480c4ad3d27a1cd6f4e1/chrome/browser/sync/test/integration/single_client_user_events_sync_test.cc
[modify] https://crrev.com/dec5aed76404ee950893480c4ad3d27a1cd6f4e1/components/sync/user_events/user_event_service_impl.cc
[modify] https://crrev.com/dec5aed76404ee950893480c4ad3d27a1cd6f4e1/components/sync/user_events/user_event_service_impl_unittest.cc

Integrat