[Sync] Implementation of model association for passwords using sync API

sync/api/sync_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/api/sync_error.h"
 
 #include <ostream>
 
 #include "base/location.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace syncer {
 
 SyncError::SyncError() {
   Clear();
 }
 
 SyncError::SyncError(const tracked_objects::Location& location,
                      ErrorType error_type,
@@ skipping 109 matching lines @@
                                   location_->line_number(),
                                   logging::LOG_ERROR).stream(),
               LOG_IS_ON(ERROR))
       << ModelTypeToString(model_type_) << " " << message_;
 }
 
 void PrintTo(const SyncError& sync_error, std::ostream* os) {
   *os << sync_error.ToString();
 }
 
+void SyncError::LogDataLoadFailure(ModelType model_type) {
+  UMA_HISTOGRAM_ENUMERATION("Sync.LocalDataFailedToLoad",
+                            model_type,
+                            MODEL_TYPE_COUNT);
+}
+
 }  // namespace syncer