Add tests for Component Updater command line arguments

chrome/browser/component_updater/chrome_component_updater_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 CHROME_BROWSER_COMPONENT_UPDATER_CHROME_COMPONENT_UPDATER_CONFIGURATOR_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_CHROME_COMPONENT_UPDATER_CONFIGURATOR_H_
 
 #include "components/update_client/configurator.h"
 
 namespace base {
 class CommandLine;
 }
 
 namespace net {
 class URLRequestContextGetter;
 }
 
 namespace component_updater {
 
+extern const char kSwitchFastUpdate[];
+extern const char kSwitchRequestParam[];
+extern const char kSwitchDisablePings[];
+extern const char kSwitchUrlSource[];
+extern const char kSwitchDisableDeltaUpdates[];
+#if defined(OS_WIN)
+extern const char kSwitchDisableBackgroundDownloads[];
+#endif  // defined(OS_WIN)
+
 update_client::Configurator* MakeChromeComponentUpdaterConfigurator(
     const base::CommandLine* cmdline,
     net::URLRequestContextGetter* context_getter);
 
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_CHROME_COMPONENT_UPDATER_CONFIGURATOR_H_