From f8ef3707dffc938fd81d0c5ad216420a45c03e08 Mon Sep 17 00:00:00 2001
From: Pedro Pontes <pepontes@microsoft.com>
Date: Wed, 21 Jul 2021 17:39:14 +0200
Subject: [PATCH] chore: cherry-pick 3feda0244490 from chromium

---
 patches/chromium/.patches                     |  1 +
 .../chromium/cherry-pick-3feda0244490.patch   | 36 +++++++++++++++++++
 2 files changed, 37 insertions(+)
 create mode 100644 patches/chromium/cherry-pick-3feda0244490.patch

diff --git a/patches/chromium/.patches b/patches/chromium/.patches
index 3cfee904e625e..357c88b43e403 100644
--- a/patches/chromium/.patches
+++ b/patches/chromium/.patches
@@ -175,3 +175,4 @@ cherry-pick-b77b38a3380c.patch
 cherry-pick-d9556a80a790.patch
 cherry-pick-910e9e40d376.patch
 cherry-pick-ff0d013f60fa.patch
+cherry-pick-3feda0244490.patch
diff --git a/patches/chromium/cherry-pick-3feda0244490.patch b/patches/chromium/cherry-pick-3feda0244490.patch
new file mode 100644
index 0000000000000..619fe129e0fb4
--- /dev/null
+++ b/patches/chromium/cherry-pick-3feda0244490.patch
@@ -0,0 +1,36 @@
+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 {