sync: add InternalComponentsFactory::Switches to simplify passing switches to internal components.

sync/internal_api/public/util/syncer_error.cc

 // Copyright (c) 2012 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 "sync/internal_api/public/util/syncer_error.h"
 
 #include "base/logging.h"
 
 namespace syncer {
 
@@ skipping 14 matching lines @@
     ENUM_CASE(SERVER_RETURN_CLEAR_PENDING);
     ENUM_CASE(SERVER_RETURN_NOT_MY_BIRTHDAY);
     ENUM_CASE(SERVER_RESPONSE_VALIDATION_FAILED);
     ENUM_CASE(SYNCER_OK);
   }
   NOTREACHED();
   return "INVALID";
 }
 #undef ENUM_CASE
 
+bool SyncerErrorIsError(SyncerError error) {
+  return error != UNSET && error != SYNCER_OK;
+}
+
 }  // namespace syncer