Add DeviceADPolicyManager to provide AD policy.

chrome/browser/chromeos/policy/device_active_directory_policy_manager.h

Index: chrome/browser/chromeos/policy/device_active_directory_policy_manager.h
diff --git a/chrome/browser/chromeos/policy/device_active_directory_policy_manager.h b/chrome/browser/chromeos/policy/device_active_directory_policy_manager.h
new file mode 100644
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+++ b/chrome/browser/chromeos/policy/device_active_directory_policy_manager.h
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+// Copyright 2016 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_CHROMEOS_POLICY_DEVICE_ACTIVE_DIRECTORY_POLICY_MANAGER_H_
+#define CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_ACTIVE_DIRECTORY_POLICY_MANAGER_H_
+
+#include <memory>
+
+#include "components/policy/core/common/cloud/cloud_policy_store.h"
+#include "components/policy/core/common/configuration_policy_provider.h"
+
+namespace policy {
+
+// ConfigurationPolicyProvider for policy from Active Directory.  The policy is
+// fetched from the Domain Controller by authpolicyd which stores it in session
+// manager and from where it is loaded by DeviceActiveDirectoryPolicyManager.
+// TODO(tnagel): Wire RefreshPolicies() through to authpolicyd.
+class DeviceActiveDirectoryPolicyManager : public ConfigurationPolicyProvider,
+                                           public CloudPolicyStore::Observer {
+ public:
+  explicit DeviceActiveDirectoryPolicyManager(
+      std::unique_ptr<CloudPolicyStore> store);
+  ~DeviceActiveDirectoryPolicyManager() override;
+
+  // ConfigurationPolicyProvider:
+  void Init(SchemaRegistry* registry) override;
+  void Shutdown() override;
+  bool IsInitializationComplete(PolicyDomain domain) const override;
+  void RefreshPolicies() override;
+
+  // CloudPolicyStore::Observer:
+  void OnStoreLoaded(CloudPolicyStore* cloud_policy_store) override;
+  void OnStoreError(CloudPolicyStore* cloud_policy_store) override;
+
+  const CloudPolicyStore* store() const { return store_.get(); }
+
+ private:
+  // Publishes the policy that's currently cached in the store.
+  void PublishPolicy();
+
+  std::unique_ptr<CloudPolicyStore> store_;
+};
+
+}  // namespace policy
+
+#endif  // CHROME_BROWSER_CHROMEOS_POLICY_DEVICE_ACTIVE_DIRECTORY_POLICY_MANAGER_H_