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

chrome/browser/sync/js/js_sync_manager_observer.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/js/js_sync_manager_observer.h"
 
 #include <cstddef>
 
 #include "base/location.h"
 #include "base/logging.h"
@@ skipping 116 matching lines @@
   HandleJsEvent(FROM_HERE, "onClearServerDataSucceeded", JsEventDetails());
 }
 
 void JsSyncManagerObserver::OnClearServerDataFailed() {
   if (!event_handler_.IsInitialized()) {
     return;
   }
   HandleJsEvent(FROM_HERE, "onClearServerDataFailed", JsEventDetails());
 }
 
+void JsSyncManagerObserver::OnUnrecoverableError(
+    const tracked_objects::Location& location,
+    const std::string& message) {
+  if (!event_handler_.IsInitialized()) {
+    return;
+  }
+  DictionaryValue details;
+  details.SetString("location", location.ToString());
+  details.SetString("message", message);
+  HandleJsEvent(FROM_HERE, "onUnrecoverableError", JsEventDetails(&details));
+}
+
+
 void JsSyncManagerObserver::HandleJsEvent(
     const tracked_objects::Location& from_here,
     const std::string& name, const JsEventDetails& details) {
   if (!event_handler_.IsInitialized()) {
     NOTREACHED();
     return;
   }
   event_handler_.Call(from_here,
                       &JsEventHandler::HandleJsEvent, name, details);
 }
 
 }  // namespace browser_sync