From b40bea896b50454ea1bb0cf8fc2edec475537f50 Mon Sep 17 00:00:00 2001
From: Alan Orozco <alanorozco@users.noreply.github.com>
Date: Fri, 16 Nov 2018 13:54:06 -0800
Subject: [PATCH] =?UTF-8?q?=F0=9F=90=9B=20Trick=20Closure=20compiler=20to?=
 =?UTF-8?q?=20preserve=20reflow=20codepath=20(#19367)?=
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---
 extensions/amp-gwd-animation/0.1/amp-gwd-animation-impl.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/extensions/amp-gwd-animation/0.1/amp-gwd-animation-impl.js b/extensions/amp-gwd-animation/0.1/amp-gwd-animation-impl.js
index 4ecf8144f70be..76218e23de304 100644
--- a/extensions/amp-gwd-animation/0.1/amp-gwd-animation-impl.js
+++ b/extensions/amp-gwd-animation/0.1/amp-gwd-animation-impl.js
@@ -551,5 +551,10 @@ export class AmpGwdRuntimeService {
  * @param {!Element} element
  */
 function reflow(element) {
-  return element./*OK*/offsetWidth;
+  // exporting global to trick Closure into thinking this function has side
+  // effects.
+  const globalRef = '__AMP_GWD_TEMP';
+  // Reading `offsetWidth` is what actually causes reflow.
+  self[globalRef] = element./*OK*/offsetWidth;
+  delete self[globalRef];
 }