Implement the ConfigDirPolicyProvider based on the AsyncPolicyLoader

chrome/browser/policy/config_dir_policy_provider.h

-// Copyright (c) 2012 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_CONFIG_DIR_POLICY_PROVIDER_H_
-#define CHROME_BROWSER_POLICY_CONFIG_DIR_POLICY_PROVIDER_H_
-#pragma once
-
-#include "base/time.h"
-#include "chrome/browser/policy/file_based_policy_provider.h"
-
-class FilePath;
-
-namespace base {
-class Value;
-}
-
-namespace policy {
-
-class PolicyBundle;
-
-// Policy provider backed by JSON files in a configuration directory.
-class ConfigDirPolicyProvider : public FileBasedPolicyProvider {
- public:
-  ConfigDirPolicyProvider(const PolicyDefinitionList* policy_list,
-                          PolicyLevel level,
-                          PolicyScope scope,
-                          const FilePath& config_dir);
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ConfigDirPolicyProvider);
-};
-
-// A provider delegate implementation backed by a set of files in a given
-// directory. The files should contain JSON-formatted policy settings. They are
-// merged together and the result is returned via the ProviderDelegate
-// interface. The files are consulted in lexicographic file name order, so the
-// last value read takes precedence in case of preference key collisions.
-class ConfigDirPolicyProviderDelegate
-    : public FileBasedPolicyProvider::ProviderDelegate {
- public:
-  ConfigDirPolicyProviderDelegate(const FilePath& config_dir,
-                                  PolicyLevel level,
-                                  PolicyScope scope);
-
-  // FileBasedPolicyProvider::ProviderDelegate implementation.
-  virtual scoped_ptr<PolicyBundle> Load() OVERRIDE;
-  virtual base::Time GetLastModification() OVERRIDE;
-
- private:
-  // Merges the 3rd party |policies| into the |bundle|.
-  void Merge3rdPartyPolicy(PolicyBundle* bundle,
-                           const base::Value* policies);
-
-  // Policies loaded by this provider will have these attributes.
-  PolicyLevel level_;
-  PolicyScope scope_;
-
-  DISALLOW_COPY_AND_ASSIGN(ConfigDirPolicyProviderDelegate);
-};
-
-}  // namespace policy
-
-#endif  // CHROME_BROWSER_POLICY_CONFIG_DIR_POLICY_PROVIDER_H_