Client-side changes to support retry GU.

sync/engine/download.cc

Index: sync/engine/download.cc
diff --git a/sync/engine/download.cc b/sync/engine/download.cc
index 2bc7f7a0a9d35be4e85e68ce60420826057f5458..8b1990daabb1a8d077d3d5731cb4532b07038464 100644
--- a/sync/engine/download.cc
+++ b/sync/engine/download.cc
@@ -331,6 +331,43 @@ void BuildDownloadUpdatesForPollImpl(
   get_updates->set_get_updates_origin(sync_pb::SyncEnums::PERIODIC);
 }
 
+void BuildDownloadUpdatesForRetry(
+    SyncSession* session,
+    bool create_mobile_bookmarks_folder,
+    ModelTypeSet request_types,
+    sync_pb::ClientToServerMessage* client_to_server_message) {
+  DVLOG(1) << "Retrying for types "
+           << ModelTypeSetToString(request_types);
+
+  InitDownloadUpdatesContext(
+      session,
+      create_mobile_bookmarks_folder,
+      client_to_server_message);
+  BuildDownloadUpdatesForRetryImpl(
+      Intersection(request_types, ProtocolTypes()),
+      session->context()->update_handler_map(),
+      client_to_server_message->mutable_get_updates());
+}
+
+void BuildDownloadUpdatesForRetryImpl(
+    ModelTypeSet proto_request_types,
+    UpdateHandlerMap* update_handler_map,
+    sync_pb::GetUpdatesMessage* get_updates) {
+  DCHECK(!proto_request_types.Empty());
+
+  InitDownloadUpdatesProgress(
+      proto_request_types,
+      update_handler_map,
+      get_updates);
+
+  // Set legacy GetUpdatesMessage.GetUpdatesCallerInfo information.
+  get_updates->mutable_caller_info()->set_source(
+      sync_pb::GetUpdatesCallerInfo::RETRY);
+
+  // Set the new and improved version of source, too.
+  get_updates->set_get_updates_origin(sync_pb::SyncEnums::RETRY);
+}
+
 SyncerError ExecuteDownloadUpdates(
     ModelTypeSet request_types,
     SyncSession* session,