Get signals working in the EXTRA_DATA section of MHTML

components/offline_pages/core/offline_page_model_impl.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_CORE_OFFLINE_PAGE_MODEL_IMPL_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_OFFLINE_PAGE_MODEL_IMPL_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 48 matching lines @@
       std::unique_ptr<OfflinePageMetadataStore> store,
       const base::FilePath& archives_dir,
       const scoped_refptr<base::SequencedTaskRunner>& task_runner);
   ~OfflinePageModelImpl() override;
 
   // Implemented methods:
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
   void SavePage(const SavePageParams& save_page_params,
                 std::unique_ptr<OfflinePageArchiver> archiver,
+                const std::string& signal_data,
                 const SavePageCallback& callback) override;
   void MarkPageAccessed(int64_t offline_id) override;
   void DeletePagesByOfflineId(const std::vector<int64_t>& offline_ids,
                               const DeletePageCallback& callback) override;
   void DeletePagesByClientIds(const std::vector<ClientId>& client_ids,
                               const DeletePageCallback& callback) override;
 
   void GetPagesMatchingQuery(
       std::unique_ptr<OfflinePageModelQuery> query,
       const MultipleOfflinePageItemCallback& callback) override;
@@ skipping 208 matching lines @@
   base::Clock* testing_clock_;
 
   base::WeakPtrFactory<OfflinePageModelImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(OfflinePageModelImpl);
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_OFFLINE_PAGE_MODEL_IMPL_H_