[Sync] Add support for performing a GetKey on startup.

sync/sessions/status_controller.cc

Index: sync/sessions/status_controller.cc
diff --git a/sync/sessions/status_controller.cc b/sync/sessions/status_controller.cc
index 3694fe43022c31f831c42efa4143dafd4b678b52..61b1094857c8d2f848b992f0c52e44e9cce540d0 100644
--- a/sync/sessions/status_controller.cc
+++ b/sync/sessions/status_controller.cc
@@ -142,6 +142,10 @@ void StatusController::set_sync_protocol_error(
   model_neutral_.sync_protocol_error = error;
 }
 
+void StatusController::set_last_get_key_result(const SyncerError result) {
+  model_neutral_.last_get_key_result = result;
+}
+
 void StatusController::set_last_download_updates_result(
     const SyncerError result) {
   model_neutral_.last_download_updates_result = result;
@@ -151,6 +155,10 @@ void StatusController::set_commit_result(const SyncerError result) {
   model_neutral_.commit_result = result;
 }
 
+SyncerError StatusController::last_get_key_result() const {
+  return model_neutral_.last_get_key_result;
+}
+
 void StatusController::update_conflicts_resolved(bool resolved) {
   model_neutral_.conflicts_resolved |= resolved;
 }