Chromad: Use DM server reply to determine enrollment type

chrome/browser/chromeos/policy/active_directory_join_delegate.h

+// Copyright 2017 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_ACTIVE_DIRECTORY_JOIN_DELEGATE_H_
+#define CHROME_BROWSER_CHROMEOS_POLICY_ACTIVE_DIRECTORY_JOIN_DELEGATE_H_
+
+#include "base/callback.h"
+
+namespace chromeos {
+
+// Called on successful Active Directory domain join. Pass Active Directory
+// realm.
+using OnDomainJoinedCallback =
+    base::OnceCallback<void(const std::string& realm)>;
+
+// Delegate being used during Enterprise Enrollment to start Active Directory

[Thiemo Nagel, 2017/02/14 16:43:06]

Nit: enterprise enrollment

[Roman Sorokin (ftl), 2017/02/15 14:01:44]

Done.

+// domain join flow.

[Thiemo Nagel, 2017/02/14 16:43:06]

Nit: For cavemen like me, maybe explain the motivation that starting AD requires
access to the actor which is not available inside enrollmenthandler?

[Roman Sorokin (ftl), 2017/02/15 14:01:44]

Done.

+class ActiveDirectoryJoinDelegate {
+ public:
+  ActiveDirectoryJoinDelegate() = default;
+  // Start the Active Directory domain join flow.
+  void virtual JoinDomain(OnDomainJoinedCallback on_joined_callback) = 0;
+
+ protected:
+  ~ActiveDirectoryJoinDelegate() = default;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ActiveDirectoryJoinDelegate);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_POLICY_ACTIVE_DIRECTORY_JOIN_DELEGATE_H_