arc: Show custom notification via notification surface

components/arc/common/notifications.mojom

 // Copyright 2015 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.
 //
-// Next MinVersion: 5
+// Next MinVersion: 6
 
 module arc.mojom;
 
 import "bitmap.mojom";
 
 // These values must be matched with the NOTIFICATION_EVENT_* constants in
 // com.android.server.ArcNotificationListenerService.
 enum ArcNotificationEvent {
   BODY_CLICKED = 0,
   CLOSED = 1,
@@ skipping 47 matching lines @@
   bool no_clear;
   // Flag if the notification has FLAG_ONGOING_EVENT.
   [MinVersion=1]
   bool ongoing_event;
   // Subtexts for list notifications.
   [MinVersion=3]
   array<string>? texts;
   // Image for image notifications.
   [MinVersion=3]
   ArcBitmap? big_picture;
+  // Flag if a notification is a custom notification backed by a notification
+  // surface. Note the flag is only used on creation. Change of the flag
+  // on notification update is ignored.
+  [MinVersion=5]
+  bool use_custom_notification;
 };
 
 [MinVersion=2]
 struct ArcToastData {
   // Unique identifier
   string id;
   // Toast text.
   string? text;
   // Toast duration in milliseconds. If -1, the toast will be displayed until
   // the dismiss button is clicked.
@@ skipping 25 matching lines @@
 
 // TODO(lhchavez): Migrate all request/response messages to Mojo.
 interface NotificationsInstance {
   // Establishes full-duplex communication with the host.
   Init@0(NotificationsHost host_ptr);
 
   // Sends an event from Chrome notification UI to Android.
   // |event| is a type of occured event.
   SendNotificationEventToAndroid@1(string key, ArcNotificationEvent event);
 };