Add base persistence interfaces for Prefetching Offline Pages.

components/offline_pages/core/prefetch/prefetch_item.cc

+// Copyright 2017 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 "components/offline_pages/core/prefetch/prefetch_item.h"
+
+namespace offline_pages {
+
+PrefetchItem::PrefetchItem() = default;
+
+PrefetchItem::PrefetchItem(const PrefetchItem& other) = default;
+
+PrefetchItem::~PrefetchItem(){};

[fgorski, 2017/05/12 22:54:06]

was git cl format OK with no space in (){}?

[carlosk, 2017/05/13 01:54:32]

That's what `git cl format` spits back... :/

+
+bool PrefetchItem::operator==(const PrefetchItem& other) const {
+  return guid == other.guid && client_name_space == other.client_name_space &&
+         client_id == other.client_id && state == other.state &&
+         url == other.url && final_archived_url == other.final_archived_url &&
+         request_archive_attempt_count == other.request_archive_attempt_count &&
+         operation_name == other.operation_name &&
+         archive_body_name == other.archive_body_name &&
+         archive_body_length == other.archive_body_length &&
+         creation_time == other.creation_time &&
+         freshness_time == other.freshness_time &&
+         error_code == other.error_code;
+}
+
+bool PrefetchItem::operator!=(const PrefetchItem& other) const {
+  return !(*this == other);
+}
+
+}  // namespace offline_pages