Import wpt@357b83b809e3cbc7a1805e7c3ca108a7980d782f

third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_script.html

Index: third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_script.html
diff --git a/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_script.html b/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_script.html
index 5e015ce98d2e56912d47d2b208bc4d6bf98e8270..cd05f224601e8781691b1de7b1a0b14615372949 100644
--- a/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_script.html
+++ b/third_party/WebKit/LayoutTests/imported/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_script.html
@@ -7,9 +7,10 @@
 <script src="/resources/testharness.js"></script>
 <script src="/resources/testharnessreport.js"></script>
 
-<iframe id="testIframe" src="support/sandbox_allow_script.html" sandbox="allow-same-origin" style="display:none"></iframe>
 <div id="log"></div>
 <script>
+  // Set up all our script stuff before the iframe starts loading, so we don't
+  // miss any messages from it.
   var step1 = false;
   var t = async_test("iframe_sandbox_allow_scripts");
 
@@ -35,5 +36,11 @@
     t.done();
   }
 
-  setTimeout(run, 500);
+  // Make sure the iframe loads before we mess with it.
+  window.addEventListener("load", function() {
+    // The load event might fire before a message from the child comes in...
+    // Wait a bit to see if that message does come in.
+    setTimeout(run, 500);
+  });
 </script>
+<iframe id="testIframe" src="support/sandbox_allow_script.html" sandbox="allow-same-origin" style="display:none"></iframe>