From 73f8f236d53c825f4ed2fbe6379ce04a56e7a865 Mon Sep 17 00:00:00 2001
From: Simon Pieters <zcorpan@gmail.com>
Date: Thu, 14 Jun 2018 08:43:34 -0400
Subject: [PATCH] Fail early if Feature Policy is not supported (#11270)

Part of #11269.
---
 feature-policy/resources/featurepolicy.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/feature-policy/resources/featurepolicy.js b/feature-policy/resources/featurepolicy.js
index bf7693fd1b96a8..55c7f98a8db31c 100644
--- a/feature-policy/resources/featurepolicy.js
+++ b/feature-policy/resources/featurepolicy.js
@@ -1,3 +1,7 @@
+// Feature test to avoid timeouts
+function assert_feature_policy_supported() {
+  assert_not_equals(document.policy, undefined, 'Feature Policy is supported');
+}
 // Tests whether a feature that is enabled/disabled by feature policy works
 // as expected.
 // Arguments:
@@ -279,6 +283,7 @@ function test_allowed_feature_for_subframe(message, feature, src, allow) {
     frame.allow = allow;
   }
   promise_test(function() {
+    assert_feature_policy_supported();
     frame.src = src;
     return new Promise(function(resolve, reject) {
       window.addEventListener('message', function handler(evt) {
@@ -305,6 +310,7 @@ function test_disallowed_feature_for_subframe(message, feature, src, allow) {
     frame.allow = allow;
   }
   promise_test(function() {
+    assert_feature_policy_supported();
     frame.src = src;
     return new Promise(function(resolve, reject) {
       window.addEventListener('message', function handler(evt) {
@@ -333,6 +339,7 @@ function test_subframe_header_policy(
     feature, frame_header_policy, src, test_expects, test_name) {
   let frame = document.createElement('iframe');
   promise_test(function() {
+    assert_feature_policy_supported()
     frame.src = src + '?pipe=sub|header(Feature-Policy,' + feature + ' '
         + frame_header_policy + ';)';
     return new Promise(function(resolve, reject) {