Server directed error handling backend code.

chrome/browser/sync/sessions/status_controller.h

Index: chrome/browser/sync/sessions/status_controller.h
diff --git a/chrome/browser/sync/sessions/status_controller.h b/chrome/browser/sync/sessions/status_controller.h
index 329871f5d5988be324a84b9f0585b16e706c9ff7..648e47a925fba3ce9890ffd8880032effe98fb5a 100644
--- a/chrome/browser/sync/sessions/status_controller.h
+++ b/chrome/browser/sync/sessions/status_controller.h
@@ -109,6 +109,9 @@ class StatusController {
   const SyncerStatus& syncer_status() const {
     return shared_.syncer_status.value();
   }
+  SyncProtocolError sync_protocol_error() const {
+    return shared_.sync_protocol_error.value();
+  }
 
   // Changelog related state.
   int64 num_server_changes_remaining() const {
@@ -229,6 +232,7 @@ class StatusController {
   void set_unsynced_handles(const std::vector<int64>& unsynced_handles);
   void increment_num_local_overwrites();
   void increment_num_server_overwrites();
+  void set_sync_protocol_error(const SyncProtocolError& error);
 
   void set_commit_set(const OrderedCommitSet& commit_set);
   void update_conflict_sets_built(bool built);