[sync] Reland of "TwoClientBookmarksSyncTest.Sanity" is flaky

components/sync/driver/glue/sync_backend_host_impl.cc

Index: components/sync/driver/glue/sync_backend_host_impl.cc
diff --git a/components/sync/driver/glue/sync_backend_host_impl.cc b/components/sync/driver/glue/sync_backend_host_impl.cc
index 06d6c1ea71f9153aeffe00abb448733b702eac0d..bc181a677399b6566f3904d32959762d0b480452 100644
--- a/components/sync/driver/glue/sync_backend_host_impl.cc
+++ b/components/sync/driver/glue/sync_backend_host_impl.cc
@@ -109,6 +109,10 @@ void SyncBackendHostImpl::Initialize(
     factory_switches.pre_commit_updates_policy =
         EngineComponentsFactory::FORCE_ENABLE_PRE_COMMIT_UPDATE_AVOIDANCE;
   }
+  if (cl->HasSwitch(switches::kSyncShortNudgeDelayForTest)) {
+    factory_switches.nudge_delay =
+        EngineComponentsFactory::NudgeDelay::SHORT_NUDGE_DELAY;
+  }
 
   std::map<ModelType, int64_t> invalidation_versions;
   sync_prefs_->GetInvalidationVersions(&invalidation_versions);