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)>;
+
+class ActiveDirectoryJoinDelegate {

[Thiemo Nagel, 2017/02/14 14:45:00]

Your ActiveDirectoryJoinDelegate frightens and confuses me.  Please add a class
comment to explain its purpose.

[Roman Sorokin (ftl), 2017/02/14 16:01:33]

Done.

+ public:
+  ActiveDirectoryJoinDelegate() = default;
+  // Shows the Active Directory domain joining screen.
+  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_