Define EnabledComponentUpdates group policy for the component updater.

components/component_updater/component_updater_service.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_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
 #define COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 19 matching lines @@
 
 namespace content {
 class ResourceThrottle;
 }
 
 namespace net {
 class URLRequestContextGetter;
 class URLRequest;
 }
 
+namespace policy {
+class ComponentUpdaterPolicyTest;
+}
+
 namespace update_client {
 class ComponentInstaller;
 class Configurator;
 struct CrxComponent;
 struct CrxUpdateItem;
 }
 
 namespace component_updater {
 
 class OnDemandUpdater;
@@ skipping 98 matching lines @@
 };
 
 using ServiceObserver = ComponentUpdateService::Observer;
 
 class OnDemandUpdater {
  public:
   virtual ~OnDemandUpdater() {}
 
  private:
   friend class OnDemandTester;
+  friend class policy::ComponentUpdaterPolicyTest;
   friend class SupervisedUserWhitelistInstaller;
   friend class ::ComponentsUI;
   friend class ::PluginObserver;
 
   // Triggers an update check for a component. |id| is a value
   // returned by GetCrxComponentID(). If an update for this component is already
   // in progress, the function returns |kInProgress|. If an update is available,
   // the update will be applied. The caller can subscribe to component update
   // service notifications and provide an optional callback to get the result
   // of the call. The function does not implement any cooldown interval.
   virtual void OnDemandUpdate(
       const std::string& id,
       ComponentUpdateService::CompletionCallback callback) = 0;
 };
 
 // Creates the component updater.
 std::unique_ptr<ComponentUpdateService> ComponentUpdateServiceFactory(
     const scoped_refptr<Configurator>& config);
 
 }  // namespace component_updater
 
 #endif  // COMPONENTS_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_