Added nudge source counters to about:sync.

sync/internal_api/sync_manager_impl.cc

Index: sync/internal_api/sync_manager_impl.cc
diff --git a/sync/internal_api/sync_manager_impl.cc b/sync/internal_api/sync_manager_impl.cc
index 20852f40ab391aa665dcae3a601239c71b314c88..8a53d788cb6b4fa842b512836988644659d7c0c3 100644
--- a/sync/internal_api/sync_manager_impl.cc
+++ b/sync/internal_api/sync_manager_impl.cc
@@ -979,6 +979,7 @@ void SyncManagerImpl::RequestNudgeForDataTypes(
   base::TimeDelta nudge_delay = NudgeStrategy::GetNudgeDelayTimeDelta(
       types.First().Get(),
       this);
+  allstatus_.IncrementNudgeCounter(NUDGE_SOURCE_LOCAL);
   scheduler_->ScheduleNudgeAsync(nudge_delay,
                                  NUDGE_SOURCE_LOCAL,
                                  types,
@@ -1273,11 +1274,13 @@ void SyncManagerImpl::OnIncomingInvalidation(
   const ModelTypeStateMap& type_state_map =
       ObjectIdStateMapToModelTypeStateMap(id_state_map);
   if (source == LOCAL_INVALIDATION) {
+    allstatus_.IncrementNudgeCounter(NUDGE_SOURCE_LOCAL_REFRESH);
     scheduler_->ScheduleNudgeWithStatesAsync(
         TimeDelta::FromMilliseconds(kSyncRefreshDelayMsec),
         NUDGE_SOURCE_LOCAL_REFRESH,
         type_state_map, FROM_HERE);
   } else if (!type_state_map.empty()) {
+    allstatus_.IncrementNudgeCounter(NUDGE_SOURCE_NOTIFICATION);
     scheduler_->ScheduleNudgeWithStatesAsync(
         TimeDelta::FromMilliseconds(kSyncSchedulerDelayMsec),
         NUDGE_SOURCE_NOTIFICATION,