Deflake header-refresh.optional.sub.html

The web_test
external/wpt/fetch/metadata/generated/header-refresh.optional.sub.html
is flaky due to occasionally timing out. Mark it as having a long
timeout. This needs to be done in the template, as it is a generated
file.

BUG=1327869

Change-Id: Iba873dff01cb427f34b64368b7b622c80bcb01e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3676659
Auto-Submit: Adam Rice <ricea@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1009410}
diff --git a/fetch/metadata/generated/header-refresh.https.optional.sub.html b/fetch/metadata/generated/header-refresh.https.optional.sub.html
index c303d87..e63ee42 100644
--- a/fetch/metadata/generated/header-refresh.https.optional.sub.html
+++ b/fetch/metadata/generated/header-refresh.https.optional.sub.html
@@ -7,6 +7,7 @@
 -->
 <html lang="en">
   <meta charset="utf-8">
+  <meta name="timeout" content="long">
   <title>HTTP headers on request for HTTP "Refresh" header</title>
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
diff --git a/fetch/metadata/generated/header-refresh.optional.sub.html b/fetch/metadata/generated/header-refresh.optional.sub.html
index 56f2466..4674ada 100644
--- a/fetch/metadata/generated/header-refresh.optional.sub.html
+++ b/fetch/metadata/generated/header-refresh.optional.sub.html
@@ -7,6 +7,7 @@
 -->
 <html lang="en">
   <meta charset="utf-8">
+  <meta name="timeout" content="long">
   <title>HTTP headers on request for HTTP "Refresh" header</title>
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>
diff --git a/fetch/metadata/tools/templates/header-refresh.optional.sub.html b/fetch/metadata/tools/templates/header-refresh.optional.sub.html
index ff497b5..ec963d5 100644
--- a/fetch/metadata/tools/templates/header-refresh.optional.sub.html
+++ b/fetch/metadata/tools/templates/header-refresh.optional.sub.html
@@ -4,6 +4,9 @@
 -->
 <html lang="en">
   <meta charset="utf-8">
+  {%- if subtests|length > 10 %}
+  <meta name="timeout" content="long">
+  {%- endif %}
   <title>HTTP headers on request for HTTP "Refresh" header</title>
   <script src="/resources/testharness.js"></script>
   <script src="/resources/testharnessreport.js"></script>