diff -r 000000000000 -r 6474c204b198 storage/src/mozStorageError.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/storage/src/mozStorageError.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozStorageError.h"
+
+namespace mozilla {
+namespace storage {
+
+////////////////////////////////////////////////////////////////////////////////
+//// Error
+
+Error::Error(int aResult,
+             const char *aMessage)
+: mResult(aResult)
+, mMessage(aMessage)
+{
+}
+
+/**
+ * Note:  This object is only ever accessed on one thread at a time.  It it not
+ *        threadsafe, but it does need threadsafe AddRef and Release.
+ */
+NS_IMPL_ISUPPORTS(
+  Error,
+  mozIStorageError
+)
+
+////////////////////////////////////////////////////////////////////////////////
+//// mozIStorageError
+
+NS_IMETHODIMP
+Error::GetResult(int32_t *_result)
+{
+  *_result = mResult;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+Error::GetMessage(nsACString &_message)
+{
+  _message = mMessage;
+  return NS_OK;
+}
+
+} // namespace storage
+} // namespace mozilla