[Offline Pages] Duplicate pages when save/delete bookmarks.

components/offline_pages/offline_page_client_policy.h

 // Copyright 2016 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.
 
 #ifndef COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_CLIENT_POLICY_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_CLIENT_POLICY_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 30 matching lines @@
 
 // The struct describing policies for various namespaces (Bookmark, Last-N etc.)
 // used by offline page model. The name_space is supposed to be key, so that
 // it's sufficient to compare name_space only when doing comparisons.
 struct OfflinePageClientPolicy {
   // Namespace to which the policy applied.
   std::string name_space;
 
   // Policy to control the lifetime of a page generated by this namespace.
   LifetimePolicy lifetime_policy;
+
+  // How many pages for the same online URL can be stored at any time.
+  // kUnlimitedPages means there's no limit.
+  size_t pages_allowed_per_url;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_CLIENT_POLICY_H_