[Easy Unlock] Port RemoteStatusUpdate class to native code.

components/proximity_auth/remote_status_update.h

+// Copyright 2014 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 COMPONENTS_PROXIMITY_AUTH_REMOTE_STATUS_UPDATE_H
+#define COMPONENTS_PROXIMITY_AUTH_REMOTE_STATUS_UPDATE_H
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+
+namespace proximity_auth {
+
+// Corresponds to the possible values for the 'user_presence' status update
+// field.
+enum UserPresence {
+  USER_PRESENT,
+  USER_ABSENT,
+  USER_PRESENCE_UNKNOWN,
+};
+
+// Corresponds to the possible values for the 'secure_screen_lock' status update
+// field.
+enum SecureScreenLockState {
+  SECURE_SCREEN_LOCK_ENABLED,
+  SECURE_SCREEN_LOCK_DISABLED,
+  SECURE_SCREEN_LOCK_STATE_UNKNOWN,
+};
+
+// Corresponds to the possible values for the 'trust_agent' status update field.
+enum TrustAgentState {
+  TRUST_AGENT_ENABLED,
+  TRUST_AGENT_DISABLED,
+  TRUST_AGENT_UNSUPPORTED,
+};
+
+// Represents a 'status_update' message received from the remote device.
+struct RemoteStatusUpdate {
+  // Parses a JSON object into a RemoteStatusUpdate. Returns a null pointer if
+  // the JSON is not valid.
+  static scoped_ptr<RemoteStatusUpdate> FromJson(const std::string& json);
+
+  UserPresence user_presence;
+  SecureScreenLockState secure_screen_lock_state;
+  TrustAgentState trust_agent_state;
+};
+
+}  // namespace proximity_auth
+
+#endif  // COMPONENTS_PROXIMITY_AUTH_REMOTE_STATUS_UPDATE_H