Support undoing offline page deletion

components/offline_pages/offline_page_item.cc

 // Copyright 2015 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/offline_page_item.h"
 
 #include "net/base/filename_util.h"
 
 namespace offline_pages {
 
 namespace {
 const int kCurrentVersion = 1;
 }
 
 OfflinePageItem::OfflinePageItem()
     : version(kCurrentVersion),
       file_size(0),
-      access_count(0) {
+      access_count(0),
+      flags(NO_FLAG) {
 }
 
 OfflinePageItem::OfflinePageItem(const GURL& url,
                                  int64 bookmark_id,
                                  const base::FilePath& file_path,
                                  int64 file_size)
     : url(url),
       bookmark_id(bookmark_id),
       version(kCurrentVersion),
       file_path(file_path),
       file_size(file_size),
-      access_count(0) {
+      access_count(0),
+      flags(NO_FLAG) {
 }
 
 OfflinePageItem::OfflinePageItem(const GURL& url,
                                  int64 bookmark_id,
                                  const base::FilePath& file_path,
                                  int64 file_size,
                                  const base::Time& creation_time)
     : url(url),
       bookmark_id(bookmark_id),
       version(kCurrentVersion),
       file_path(file_path),
       file_size(file_size),
       creation_time(creation_time),
       last_access_time(creation_time),
-      access_count(0) {
+      access_count(0),
+      flags(NO_FLAG) {
 }
 
 OfflinePageItem::~OfflinePageItem() {
 }
 
 GURL OfflinePageItem::GetOfflineURL() const {
   return net::FilePathToFileURL(file_path);
 }
 
+bool OfflinePageItem::IsMarkedForDeletion() const {
+  return (static_cast<int>(flags) & static_cast<int>(MARKED_FOR_DELETION)) != 0;
+}
+
+void OfflinePageItem::MarkForDeletion() {
+  flags = static_cast<Flags>(static_cast<int>(flags) | MARKED_FOR_DELETION);
+}
+
+void OfflinePageItem::ClearMarkForDeletion() {
+  flags = static_cast<Flags>(
+      static_cast<int>(flags) & ~(static_cast<int>(MARKED_FOR_DELETION)));
+}
+
 }  // namespace offline_pages