Implement the windows policy provider based on the AsyncPolicyLoader.

chrome/browser/policy/configuration_policy_loader_win.h

-// Copyright (c) 2011 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_POLICY_CONFIGURATION_POLICY_LOADER_WIN_H_
-#define CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_LOADER_WIN_H_
-#pragma once
-
-#include "base/synchronization/waitable_event.h"
-#include "base/win/object_watcher.h"
-#include "chrome/browser/policy/asynchronous_policy_loader.h"
-
-namespace policy {
-
-// Keeps watch on Windows Group Policy notification event to trigger a policy
-// reload when Group Policy changes.
-class ConfigurationPolicyLoaderWin
-    : public AsynchronousPolicyLoader,
-      public base::win::ObjectWatcher::Delegate {
- public:
-  ConfigurationPolicyLoaderWin(
-      AsynchronousPolicyProvider::Delegate* delegate,
-      int reload_interval_minutes);
-  virtual ~ConfigurationPolicyLoaderWin() {}
-
-  // AsynchronousPolicyLoader overrides:
-  virtual void Reload(bool force) OVERRIDE;
-
- protected:
-  // AsynchronousPolicyLoader overrides:
-  virtual void InitOnFileThread() OVERRIDE;
-  virtual void StopOnFileThread() OVERRIDE;
-
- private:
-  // Updates the watchers and schedules the reload task if appropriate.
-  void SetupWatches();
-
-  // ObjectWatcher::Delegate overrides:
-  virtual void OnObjectSignaled(HANDLE object) OVERRIDE;
-
-  base::WaitableEvent user_policy_changed_event_;
-  base::WaitableEvent machine_policy_changed_event_;
-  base::win::ObjectWatcher user_policy_watcher_;
-  base::win::ObjectWatcher machine_policy_watcher_;
-  bool user_policy_watcher_failed_;
-  bool machine_policy_watcher_failed_;
-
-  DISALLOW_COPY_AND_ASSIGN(ConfigurationPolicyLoaderWin);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_CONFIGURATION_POLICY_LOADER_WIN_H_