sync: Expose sync functionality as functions

sync/sessions/nudge_tracker.cc

Index: sync/sessions/nudge_tracker.cc
diff --git a/sync/sessions/nudge_tracker.cc b/sync/sessions/nudge_tracker.cc
index 97f211f5a19d9b4b76fd4fe199281882dd2c08f6..144860b1a8b3e647b29bc35983f651ca9a0c54f1 100644
--- a/sync/sessions/nudge_tracker.cc
+++ b/sync/sessions/nudge_tracker.cc
@@ -28,8 +28,8 @@ NudgeTracker::NudgeTracker()
 
 NudgeTracker::~NudgeTracker() { }
 
-bool NudgeTracker::IsSyncRequired() {
-  for (TypeTrackerMap::iterator it = type_trackers_.begin();
+bool NudgeTracker::IsSyncRequired() const {
+  for (TypeTrackerMap::const_iterator it = type_trackers_.begin();
        it != type_trackers_.end(); ++it) {
     if (it->second.IsSyncRequired()) {
       return true;
@@ -195,6 +195,13 @@ SyncSourceInfo NudgeTracker::GetSourceInfo() const {
   return SyncSourceInfo(updates_source_, invalidation_map);
 }
 
+void NudgeTracker::SetLegacyNotificationHint(
+    ModelType type,
+    sync_pb::DataTypeProgressMarker* progress) const {
+  DCHECK(type_trackers_.find(type) != type_trackers_.end());
+  type_trackers_.find(type)->second.SetLegacyNotificationHint(progress);
+}
+
 sync_pb::GetUpdatesCallerInfo::GetUpdatesSource NudgeTracker::updates_source()
     const {
   return updates_source_;