[subresource_filter] SB throttle can send multiple speculative requests.

components/subresource_filter/content/browser/fake_safe_browsing_database_manager.h

 // Copyright 2017 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_SUBRESOURCE_FILTER_CONTENT_BROWSER_FAKE_SAFE_BROWSING_DATABASE_MANAGER_H_
 #define COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_FAKE_SAFE_BROWSING_DATABASE_MANAGER_H_
 
 #include <map>
+#include <set>
 
 #include "base/macros.h"
 #include "components/safe_browsing_db/test_database_manager.h"
 #include "content/public/common/resource_type.h"
 
 class GURL;
 
 // Database manager that allows any URL to be configured as blacklisted for
 // testing.
 class FakeSafeBrowsingDatabaseManager
@@ skipping 15 matching lines @@
   bool IsSupported() const override;
   void CancelCheck(Client* client) override;
   bool ChecksAreAlwaysAsync() const override;
   bool CanCheckResourceType(
       content::ResourceType /* resource_type */) const override;
   safe_browsing::ThreatSource GetThreatSource() const override;
   bool CheckExtensionIDs(const std::set<std::string>& extension_ids,
                          Client* client) override;
 
  private:
+  void OnCheckUrlForSubresourceFilterComplete(Client* client, const GURL& url);
+
   std::map<GURL, safe_browsing::SBThreatType> url_to_threat_type_;
+  std::set<Client*> checks_;
   bool simulate_timeout_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeSafeBrowsingDatabaseManager);
 };
 
 #endif  // COMPONENTS_SUBRESOURCE_FILTER_CONTENT_BROWSER_FAKE_SAFE_BROWSING_DATABASE_MANAGER_H_