sync: Support non-blocking initial sync in proto

sync/internal_api/sync_manager_impl.cc

 // Copyright (c) 2012 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 "sync/internal_api/sync_manager_impl.h"
 
 #include <string>
 
 #include "base/base64.h"
 #include "base/bind.h"
@@ skipping 879 matching lines @@
   // TODO(lipalani) : Calculate the nudge delay based on all types.
   base::TimeDelta nudge_delay = NudgeStrategy::GetNudgeDelayTimeDelta(
       types.First().Get(),
       this);
   scheduler_->ScheduleLocalNudge(nudge_delay,
                                  types,
                                  nudge_location);
 }
 
 void SyncManagerImpl::NudgeForInitialDownload(syncer::ModelType type) {
-  // TODO(rlarocque): Initial downloads should have a separate nudge type.
   DCHECK(thread_checker_.CalledOnValidThread());
-  RefreshTypes(ModelTypeSet(type));
+  scheduler_->ScheduleInitialSyncNudge(type);
 }
 
 void SyncManagerImpl::NudgeForCommit(syncer::ModelType type) {
   DCHECK(thread_checker_.CalledOnValidThread());
   RequestNudgeForDataTypes(FROM_HERE, ModelTypeSet(type));
 }
 
 void SyncManagerImpl::NudgeForRefresh(syncer::ModelType type) {
   DCHECK(thread_checker_.CalledOnValidThread());
   RefreshTypes(ModelTypeSet(type));
@@ skipping 231 matching lines @@
 int SyncManagerImpl::GetDefaultNudgeDelay() {
   return kDefaultNudgeDelayMilliseconds;
 }
 
 // static.
 int SyncManagerImpl::GetPreferencesNudgeDelay() {
   return kPreferencesNudgeDelayMilliseconds;
 }
 
 }  // namespace syncer