Introduce the plumbing necessary to report Unrecoverable error from model safe workers.

chrome/browser/sync/engine/syncer_types.cc

Index: chrome/browser/sync/engine/syncer_types.cc
diff --git a/chrome/browser/sync/engine/syncer_types.cc b/chrome/browser/sync/engine/syncer_types.cc
index 8bc5524e4ec1b9534267fd0a904f94d2bf06a12d..4a8a9ad15a8838d762e8dd93ca6a227a2f41c498 100644
--- a/chrome/browser/sync/engine/syncer_types.cc
+++ b/chrome/browser/sync/engine/syncer_types.cc
@@ -10,6 +10,16 @@ SyncEngineEvent::SyncEngineEvent(EventCause cause) : what_happened(cause),
                                                      snapshot(NULL) {
 }
 
+SyncEngineEvent::SyncEngineEvent(
+    const tracked_objects::Location& unrecoverable_error_location,
+    const std::string& message) : unrecoverable_error_info(
+                                      unrecoverable_error_location,
+                                      message),
+                                  what_happened(
+                                      SyncEngineEvent::UNRECOVERABLE_ERROR),
+                                  snapshot(NULL) {
+}
+
 SyncEngineEvent::~SyncEngineEvent() {}
 
 }  // namespace browser_sync