Implement Windows GPO support for "dlpref" in component updater.

components/update_client/test_configurator.h

 // Copyright 2014 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_UPDATE_CLIENT_TEST_CONFIGURATOR_H_
 #define COMPONENTS_UPDATE_CLIENT_TEST_CONFIGURATOR_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 50 matching lines @@
   int StepDelay() const override;
   int OnDemandDelay() const override;
   int UpdateDelay() const override;
   std::vector<GURL> UpdateUrl() const override;
   std::vector<GURL> PingUrl() const override;
   base::Version GetBrowserVersion() const override;
   std::string GetChannel() const override;
   std::string GetLang() const override;
   std::string GetOSLongName() const override;
   std::string ExtraRequestParams() const override;
+  std::string GetDownloadPreference() const override;
   net::URLRequestContextGetter* RequestContext() const override;
   scoped_refptr<OutOfProcessPatcher> CreateOutOfProcessPatcher() const override;
   bool DeltasEnabled() const override;
   bool UseBackgroundDownloader() const override;
   scoped_refptr<base::SequencedTaskRunner> GetSequencedTaskRunner()
       const override;
 
   void SetOnDemandTime(int seconds);
   void SetInitialDelay(int seconds);
+  void SetDownloadPreference(const std::string& download_preference);
 
  private:
   friend class base::RefCountedThreadSafe<TestConfigurator>;
 
   ~TestConfigurator() override;
 
   scoped_refptr<base::SequencedTaskRunner> worker_task_runner_;
 
   int initial_time_;
   int ondemand_time_;
+  std::string download_preference_;
 
   scoped_refptr<net::TestURLRequestContextGetter> context_;
 
   DISALLOW_COPY_AND_ASSIGN(TestConfigurator);
 };
 
 }  // namespace update_client
 
 #endif  // COMPONENTS_UPDATE_CLIENT_TEST_CONFIGURATOR_H_