Get signals working in the EXTRA_DATA section of MHTML

components/offline_pages/core/stub_offline_page_model.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_STUB_OFFLINE_PAGE_MODEL_H_
 #define COMPONENTS_OFFLINE_PAGES_CORE_STUB_OFFLINE_PAGE_MODEL_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 #include "components/keyed_service/core/keyed_service.h"
 #include "components/offline_pages/core/client_policy_controller.h"
 #include "components/offline_pages/core/offline_page_model.h"
 
 namespace offline_pages {
 
 // Stub implementation of OfflinePageModel interface for testing. Besides using
 // as a stub for tests, it may also be subclassed to mock specific methods
 // needed for a set of tests.
 class StubOfflinePageModel : public OfflinePageModel, public KeyedService {
  public:
   StubOfflinePageModel();
   ~StubOfflinePageModel() override;
 
   void AddObserver(Observer* observer) override;
   void RemoveObserver(Observer* observer) override;
   void SavePage(const SavePageParams& save_page_params,
                 std::unique_ptr<OfflinePageArchiver> archiver,
+                const std::vector<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;
   void GetPagesByClientIds(
@@ skipping 21 matching lines @@
   OfflineEventLogger* GetLogger() override;
 
  private:
   ClientPolicyController policy_controller_;
   std::vector<int64_t> offline_ids_;
 };
 
 }  // namespace offline_pages
 
 #endif  // COMPONENTS_OFFLINE_PAGES_CORE_STUB_OFFLINE_PAGE_MODEL_H_