Propagate more information about ValueStore errors to callers, notably an

chrome/browser/value_store/value_store_util.cc

Index: chrome/browser/value_store/value_store_util.cc
diff --git a/chrome/browser/value_store/value_store_util.cc b/chrome/browser/value_store/value_store_util.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6924803d2a7e3ba2d184059699d8217fc742908b
--- /dev/null
+++ b/chrome/browser/value_store/value_store_util.cc
@@ -0,0 +1,21 @@
+// Copyright 2013 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/value_store/value_store_util.h"
+
+namespace value_store_util {
+
+scoped_ptr<std::string> NewKey(const std::string& key) {
+  return make_scoped_ptr(new std::string(key));
+}
+
+scoped_ptr<std::string> NoKey() {
+  return scoped_ptr<std::string>();
+}
+
+scoped_ptr<ValueStore::Error> NoError() {
+  return scoped_ptr<ValueStore::Error>();
+}
+
+}  // namespace value_store_util