Do we support per-datatype throttling using the THROTTLED response? We should make sure we support both per-datatype throttling and exponential backoff.

We only support per-datatype THROTTLED, but for exponential backoff, we do not support per-datatype currently I think.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/dcb17ac181e0c58d3bee7fece41e712df434f904

commit dcb17ac181e0c58d3bee7fece41e712df434f904
Author: gangwu <gangwu@chromium.org>
Date: Tue Nov 15 20:55:58 2016

[Sync] Sync client should to exponential backoff when receive partial failure.

BUG= 656072 

Before this CL, Sync will throttle the data types in
error_data_type_ids, which is wrong, Sync should exponential backoff
those data type.

This CL also fix several bugs.
1. When Sync client receive error THROTTLED, and error_data_type_ids is set,
Sync client will throttle those datatypes, and also throttle whole client.
This is wrong, the whole client should not get throttled in this case.
To fix this, when this case happened, SyncerProtoUtil::PostClientToServerMessage
will throttled the data types, and return PARTIAL_FAILURE instead of THROTTLED.

2. |scheduled_nudge_time_| in SyncSchedulerImpl is not update correctly,
so Sync client will sync less frequently than expected.
To fix this, I delete |scheduled_nudge_time_| and get the time directly from
|global_wakeup_timer_| (previously pending_wakeup_timer_).

3. When Sync client received PARTIAL_FAILURE, not only the data type in
error_data_type_ids got throttled, the whole client got exponential backoff.
To fix this, add an early return in SyncSchedulerImpl::HandleFailure when
receive PARTIAL_FAILURE.

Review-Url: https://codereview.chromium.org/2475043002
Cr-Commit-Position: refs/heads/master@{#432255}

[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/browser_sync/profile_sync_service.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine/sync_status.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/all_status.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/all_status.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/data_type_tracker.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/data_type_tracker.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/nudge_tracker.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/nudge_tracker.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/nudge_tracker_unittest.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/sync_cycle.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/test_util.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/cycle/test_util.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/get_updates_delegate.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/get_updates_processor.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/sync_engine_event_listener.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/sync_manager_impl.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/sync_manager_impl.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/sync_scheduler_impl.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/sync_scheduler_impl.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/sync_scheduler_impl_unittest.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/syncer_proto_util.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/engine_impl/syncer_unittest.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/test/engine/fake_sync_scheduler.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/test/engine/fake_sync_scheduler.h
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/test/engine/mock_connection_manager.cc
[modify] https://crrev.com/dcb17ac181e0c58d3bee7fece41e712df434f904/components/sync/test/engine/mock_connection_manager.h