Add a counter to calculate the total size of site data.

chrome/browser/browsing_data/mock_browsing_data_appcache_helper.h

 // Copyright (c) 2012 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 CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_APPCACHE_HELPER_H_
 #define CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_APPCACHE_HELPER_H_
 
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "chrome/browser/browsing_data/browsing_data_appcache_helper.h"
 
 class MockBrowsingDataAppCacheHelper
     : public BrowsingDataAppCacheHelper {
  public:
   explicit MockBrowsingDataAppCacheHelper(
       content::BrowserContext* browser_context);
 
   void StartFetching(const FetchCallback& completion_callback) override;
   void DeleteAppCacheGroup(const GURL& manifest_url) override;
 
+  // Adds AppCache samples.
+  void AddAppCacheSamples();
+
+  // Notifies the callback.
+  void Notify();
+
  private:
   ~MockBrowsingDataAppCacheHelper() override;
 
   FetchCallback completion_callback_;
 
+  scoped_refptr<content::AppCacheInfoCollection> response_;
+
   DISALLOW_COPY_AND_ASSIGN(MockBrowsingDataAppCacheHelper);
 };
 
 #endif  // CHROME_BROWSER_BROWSING_DATA_MOCK_BROWSING_DATA_APPCACHE_HELPER_H_