cherry-pick-3feda0244490.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Reilly Grant <reillyg@chromium.org>
Date: Mon, 28 Jun 2021 21:55:24 +0000
Subject: serial: Fix parent class tracing for SerialPort

When SerialPort was updated to be ActiveScriptWrappable and an
EventTarget the Trace method was not updated to call the parent class
trace methods.

(cherry picked from commit 4059ecc3a5352601a4d79196f90c8ca19262afe1)

Bug: 1220078
Change-Id: If6967a913268bce86d4488359a9418a814530f84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2965255
Auto-Submit: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#893039}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2992740
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/branch-heads/4472@{#1531}
Cr-Branched-From: 3d60439cfb36485e76a1c5bb7f513d3721b20da1-refs/heads/master@{#870763}

diff --git a/third_party/blink/renderer/modules/serial/serial_port.cc b/third_party/blink/renderer/modules/serial/serial_port.cc
index 989104ef12774896c254812fff804eaafc5b2e6c..ee3c26a0a711751de93e3bc2ed457b54a84d430d 100644
--- a/third_party/blink/renderer/modules/serial/serial_port.cc
+++ b/third_party/blink/renderer/modules/serial/serial_port.cc
@@ -492,6 +492,7 @@ void SerialPort::Trace(Visitor* visitor) const {
   visitor->Trace(signal_resolvers_);
   visitor->Trace(close_resolver_);
   ScriptWrappable::Trace(visitor);
+  ActiveScriptWrappable<SerialPort>::Trace(visitor);
 }
 
 ExecutionContext* SerialPort::GetExecutionContext() const {