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

components/sync/engine_impl/get_updates_delegate.cc

 // Copyright 2014 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.
 
 #include "components/sync/engine_impl/get_updates_delegate.h"
 
 #include "components/sync/engine_impl/directory_update_handler.h"
 #include "components/sync/engine_impl/events/configure_get_updates_request_event.h"
 #include "components/sync/engine_impl/events/normal_get_updates_request_event.h"
 #include "components/sync/engine_impl/events/poll_get_updates_request_event.h"
@@ skipping 51 matching lines @@
   if (nudge_tracker_.GetLegacySource() == sync_pb::GetUpdatesCallerInfo::RETRY)
     get_updates->set_get_updates_origin(sync_pb::SyncEnums::RETRY);
 
   // Fill in the notification hints.
   for (int i = 0; i < get_updates->from_progress_marker_size(); ++i) {
     sync_pb::DataTypeProgressMarker* progress_marker =
         get_updates->mutable_from_progress_marker(i);
     ModelType type =
         GetModelTypeFromSpecificsFieldNumber(progress_marker->data_type_id());
 
-    DCHECK(!nudge_tracker_.IsTypeThrottled(type))
+    DCHECK(!nudge_tracker_.IsTypeBlocked(type))
         << "Throttled types should have been removed from the request_types.";
 
     nudge_tracker_.SetLegacyNotificationHint(type, progress_marker);
     nudge_tracker_.FillProtoMessage(
         type, progress_marker->mutable_get_update_triggers());
   }
 }
 
 void NormalGetUpdatesDelegate::ApplyUpdates(
     ModelTypeSet gu_types,
@@ skipping 79 matching lines @@
 }
 
 std::unique_ptr<ProtocolEvent> PollGetUpdatesDelegate::GetNetworkRequestEvent(
     base::Time timestamp,
     const sync_pb::ClientToServerMessage& request) const {
   return std::unique_ptr<ProtocolEvent>(
       new PollGetUpdatesRequestEvent(timestamp, request));
 }
 
 }  // namespace syncer