Implement the mac policy provider based on the AsyncPolicyLoader.

chrome/browser/policy/policy_loader_mac.h

Index: chrome/browser/policy/policy_loader_mac.h
diff --git a/chrome/browser/policy/policy_loader_mac.h b/chrome/browser/policy/policy_loader_mac.h
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+// 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_POLICY_LOADER_MAC_H_
+#define CHROME_BROWSER_POLICY_POLICY_LOADER_MAC_H_
+#pragma once
+
+#include <CoreFoundation/CoreFoundation.h>
+
+#include "base/file_path.h"
+#include "base/files/file_path_watcher.h"
+#include "chrome/browser/policy/async_policy_loader.h"
+
+class MacPreferences;
+
+namespace base {
+class Value;
+}  // namespace base
+
+namespace policy {
+
+struct PolicyDefinitionList;
+
+// A policy loader that loads policies from the Mac preferences system, and
+// watches the managed preferences files for updates.
+class PolicyLoaderMac : public AsyncPolicyLoader {
+ public:
+  PolicyLoaderMac(const PolicyDefinitionList* policy_list,
+                  MacPreferences* preferences);
+  virtual ~PolicyLoaderMac();
+
+  // AsyncPolicyLoader implementation.
+  virtual void InitOnFile() OVERRIDE;
+  virtual scoped_ptr<PolicyBundle> Load() OVERRIDE;
+  virtual base::Time LastModificationTime() OVERRIDE;
+
+  // Converts a CFPropertyListRef to the equivalent base::Value. CFDictionary
+  // entries whose key is not a CFStringRef are ignored.
+  // The returned value is owned by the caller.
+  // Returns NULL if an invalid CFType was found, such as CFDate or CFData.
+  static base::Value* CreateValueFromProperty(CFPropertyListRef property);
+
+ private:
+  // Callback for the FilePathWatcher.
+  void OnFileUpdated(const FilePath& path, bool error);
+
+  // List of recognized policies.
+  const PolicyDefinitionList* policy_list_;
+
+  scoped_ptr<MacPreferences> preferences_;
+
+  // Path to the managed preferences file for the current user, if it could
+  // be found. Updates of this file trigger a policy reload.
+  FilePath managed_policy_path_;
+
+  // Watches for events on the |managed_policy_path_|.
+  base::files::FilePathWatcher watcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(PolicyLoaderMac);
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_POLICY_POLICY_LOADER_MAC_H_