Add routing info and unrecoverable error info to about:sync

chrome/browser/sync/engine/model_safe_worker.cc

 // Copyright (c) 2010 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/engine/model_safe_worker.h"
 
 namespace browser_sync {
 
 ModelSafeGroup GetGroupForModelType(const syncable::ModelType type,
                                     const ModelSafeRoutingInfo& routes) {
   ModelSafeRoutingInfo::const_iterator it = routes.find(type);
   if (it == routes.end()) {
     // TODO(tim): We shouldn't end up here for TOP_LEVEL_FOLDER, but an issue
     // with the server's PermanentItemPopulator is causing TLF updates in
     // some cases.  See bug 36735.
     if (type != syncable::UNSPECIFIED && type != syncable::TOP_LEVEL_FOLDER)
       NOTREACHED() << "Entry does not belong to active ModelSafeGroup!";
     return GROUP_PASSIVE;
   }
   return it->second;
 }
 
+std::string ModelSafeGroupToString(ModelSafeGroup group) {
+  switch (group) {
+    case GROUP_UI:
+      return "GROUP_UI";
+    case GROUP_DB:
+      return "GROUP_DB";
+    case GROUP_HISTORY:
+      return "GROUP_HISTORY";
+    case GROUP_PASSIVE:
+      return "GROUP_PASSIVE";
+    default:
+      NOTREACHED();
+      return "INVALID";
+  }
+}
+
 }  // namespace browser_sync