Implement an API to allow passing an "ap" parameter to component updates.

chrome/browser/component_updater/sth_set_component_installer.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 CHROME_BROWSER_COMPONENT_UPDATER_STH_SET_COMPONENT_INSTALLER_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_STH_SET_COMPONENT_INSTALLER_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 42 matching lines @@
   bool OnCustomInstall(const base::DictionaryValue& manifest,
                        const base::FilePath& install_dir) override;
   bool VerifyInstallation(const base::DictionaryValue& manifest,
                           const base::FilePath& install_dir) const override;
   void ComponentReady(const base::Version& version,
                       const base::FilePath& install_dir,
                       scoped_ptr<base::DictionaryValue> manifest) override;
   base::FilePath GetBaseDirectory() const override;
   void GetHash(std::vector<uint8_t>* hash) const override;
   std::string GetName() const override;
+  std::string GetAp() const override;
 
   // Reads and parses the on-disk json.
   void LoadSTHsFromDisk(const base::FilePath& sths_file_path,
                         const base::Version& version);
 
   // Handle successful parsing of JSON by distributing the new STH.
   void OnJsonParseSuccess(const std::string& log_id,
                           scoped_ptr<base::Value> parsed_json);
 
   // STH parsing failed - do nothing.
   void OnJsonParseError(const std::string& log_id, const std::string& error);
 
   scoped_ptr<net::ct::STHObserver> sth_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(STHSetComponentInstallerTraits);
 };
 
 void RegisterSTHSetComponent(ComponentUpdateService* cus,
                              const base::FilePath& user_data_dir);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_STH_SET_COMPONENT_INSTALLER_H_