[Offline] Adding archiver interface

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 <vector>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 #include "components/keyed_service/core/keyed_service.h"
+#include "components/offline_pages/offline_page_archiver.h"
 
 class GURL;
 
 namespace offline_pages {
 
 struct OfflinePageItem;
 class OfflinePageMetadataStore;
 
 // Serivce for saving pages offline, storing the offline copy and metadata, and
 // retrieving them upon request.
-class OfflinePageModel : public KeyedService {
+class OfflinePageModel : public KeyedService,
+                         public OfflinePageArchiver::Client {
  public:
-  explicit OfflinePageModel(scoped_ptr<OfflinePageMetadataStore> store);
+  OfflinePageModel(scoped_ptr<OfflinePageMetadataStore> store,
+                   OfflinePageArchiver* archiver);
   ~OfflinePageModel() override;
 
-  // KeyedService:
+  // KeyedService implementation.
   void Shutdown() override;
 
+  // OfflinePageArchiver::Client implementation.
+  void OnCreateArchiveSuccess(const OfflinePageArchiver::Request& request,
+                              const base::FilePath& file_path) override;
+  void OnCreateArchiveFailure(
+      const OfflinePageArchiver::Request& request) override;
+
   // Saves the page loaded in the web contents offline.
   void SavePageOffline(const GURL& url);
 
   // Gets a set of all offline pages metadata.
   std::vector<OfflinePageItem> GetAllOfflinePages();
 
   // Methods for testing only:
   OfflinePageMetadataStore* GetStoreForTesting();
 
  private:
   // Persistent store for offline page metadata.
   scoped_ptr<OfflinePageMetadataStore> store_;
 
+  // Offline page archiver. Outlives the model. Owned by the embedder.
+  OfflinePageArchiver* archiver_;
+
   DISALLOW_COPY_AND_ASSIGN(OfflinePageModel);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_OFFLINE_PAGE_MODEL_H_