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

components/offline_pages/offline_page_model.h

 // 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.
 
 #ifndef COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
 #define COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 56 matching lines @@
   using CheckPagesExistOfflineResult =
       offline_pages::CheckPagesExistOfflineResult;
   using MultipleOfflinePageItemResult =
       offline_pages::MultipleOfflinePageItemResult;
   using DeletePageResult = offline_pages::DeletePageResult;
   using SavePageResult = offline_pages::SavePageResult;
 
   // Returns true if saving an offline page may be attempted for |url|.
   static bool CanSaveURL(const GURL& url);
 
+  // Returns true if the page with |client_id| is initiated by user.
+  static bool IsUserInitiated(const ClientId& client_id);
+
   OfflinePageModel();
   ~OfflinePageModel() override;
 
   virtual void AddObserver(Observer* observer) = 0;
   virtual void RemoveObserver(Observer* observer) = 0;
 
   // Attempts to save a page addressed by |url| offline. Requires that the model
   // is loaded.  Generates a new offline id and returns it.
   virtual void SavePage(const GURL& url,
                         const ClientId& client_id,
@@ skipping 104 matching lines @@
   // Returns the policy controller.
   virtual ClientPolicyController* GetPolicyController() = 0;
 
   // TODO(dougarnett): Remove this and its uses.
   virtual bool is_loaded() const = 0;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_