Mojo C++ bindings: support enum validation.

ui/arc/notification/arc_notification_item.cc

 // 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.
 
 #include "ui/arc/notification/arc_notification_item.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/strings/string16.h"
@@ skipping 109 matching lines @@
     case ArcNotificationType::PROGRESS:
       type = message_center::NOTIFICATION_TYPE_PROGRESS;
       rich_data.timestamp = base::Time::UnixEpoch() +
                             base::TimeDelta::FromMilliseconds(data.time);
       rich_data.progress = std::max(
           0, std::min(100, static_cast<int>(std::round(
                                static_cast<float>(data.progress_current) /
                                data.progress_max * 100))));
       break;
   }
-  DCHECK(ArcNotificationType_IsValidValue(data.type))
-      << "Unsupported notification type: " << data.type;
+  DCHECK(IsKnownEnumValue(data.type)) << "Unsupported notification type: "
+                                      << data.type;
 
   for (size_t i = 0; i < data.buttons.size(); i++) {
     rich_data.buttons.push_back(message_center::ButtonInfo(
         base::UTF8ToUTF16(data.buttons.at(i)->label.get())));
   }
 
   // The identifier of the notifier, which is used to distinguish the notifiers
   // in the message center.
   message_center::NotifierId notifier_id(
       message_center::NotifierId::SYSTEM_COMPONENT, kNotifierId);
@@ skipping 62 matching lines @@
   message_center_->AddNotification(std::move(notification_));
 
   if (newer_data_) {
     // There is the newer data, so updates again.
     ArcNotificationDataPtr data(std::move(newer_data_));
     UpdateWithArcNotificationData(*data);
   }
 }
 
 }  // namespace arc