Track merged nudge sources

sync/internal_api/debug_info_event_listener.cc

Index: sync/internal_api/debug_info_event_listener.cc
diff --git a/sync/internal_api/debug_info_event_listener.cc b/sync/internal_api/debug_info_event_listener.cc
index a356f847b84e738b2e71f2813f91f0fb29169133..1bd83e42af3d43c3cc1cf5f1660523b43e0d7fae 100644
--- a/sync/internal_api/debug_info_event_listener.cc
+++ b/sync/internal_api/debug_info_event_listener.cc
@@ -43,6 +43,26 @@ void DebugInfoEventListener::OnSyncCycleCompleted(
   sync_completed_event_info->mutable_caller_info()->set_notifications_enabled(
       snapshot.notifications_enabled());
 
+  // Log the sources and per-type payloads coalesced into this session.
+  const std::vector<sessions::SyncSourceInfo>& snap_sources =
+      snapshot.debug_info_sources_list();
+  for (std::vector<sessions::SyncSourceInfo>::const_iterator source_iter =
+       snap_sources.begin(); source_iter != snap_sources.end(); ++source_iter) {
+    sync_pb::SourceInfo* pb_source_info =
+        sync_completed_event_info->add_source_info();
+
+    pb_source_info->set_source(source_iter->updates_source);
+
+    for (ModelTypeInvalidationMap::const_iterator type_iter =
+         source_iter->types.begin();
+         type_iter != source_iter->types.end(); ++type_iter) {
+      sync_pb::TypeHint* pb_type_hint = pb_source_info->add_type_hint();
+      pb_type_hint->set_data_type_id(
+          GetSpecificsFieldNumberFromModelType(type_iter->first));
+      pb_type_hint->set_has_valid_hint(!type_iter->second.payload.empty());
+    }
+  }
+
   AddEventToQueue(event_info);
 }