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@@ -0,0 +1,36 @@
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+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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+From: Reilly Grant <[email protected]>
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+Date: Mon, 28 Jun 2021 21:55:24 +0000
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+Subject: serial: Fix parent class tracing for SerialPort
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+
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+When SerialPort was updated to be ActiveScriptWrappable and an
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+EventTarget the Trace method was not updated to call the parent class
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+trace methods.
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+
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+(cherry picked from commit 4059ecc3a5352601a4d79196f90c8ca19262afe1)
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+
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+Bug: 1220078
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+Change-Id: If6967a913268bce86d4488359a9418a814530f84
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+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2965255
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+Auto-Submit: Reilly Grant <[email protected]>
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+Commit-Queue: Tom Sepez <[email protected]>
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+Reviewed-by: Tom Sepez <[email protected]>
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+Cr-Original-Commit-Position: refs/heads/master@{#893039}
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+Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2992740
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+Bot-Commit: Rubber Stamper <[email protected]>
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+Commit-Queue: Reilly Grant <[email protected]>
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+Cr-Commit-Position: refs/branch-heads/4472@{#1531}
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+Cr-Branched-From: 3d60439cfb36485e76a1c5bb7f513d3721b20da1-refs/heads/master@{#870763}
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+
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+diff --git a/third_party/blink/renderer/modules/serial/serial_port.cc b/third_party/blink/renderer/modules/serial/serial_port.cc
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+index 989104ef12774896c254812fff804eaafc5b2e6c..ee3c26a0a711751de93e3bc2ed457b54a84d430d 100644
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+--- a/third_party/blink/renderer/modules/serial/serial_port.cc
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++++ b/third_party/blink/renderer/modules/serial/serial_port.cc
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+@@ -492,6 +492,7 @@ void SerialPort::Trace(Visitor* visitor) const {
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+ visitor->Trace(signal_resolvers_);
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+ visitor->Trace(close_resolver_);
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+ ScriptWrappable::Trace(visitor);
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++ ActiveScriptWrappable<SerialPort>::Trace(visitor);
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+ }
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+
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+ ExecutionContext* SerialPort::GetExecutionContext() const {
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Pedro Pontes