Bug 1526603 [wpt PR 15234] - Add support for freezing iframes, a=testonly

Automatic update from web-platform-tests Add support for freezing iframes Frames that aren't loading are not visible in the viewport will be frozen if --enable-features=FreezeFrames is provided. This will eventually be converted to testing feature policies for frames. BUG=907125 Change-Id: Ib0badb3f92df4ce4921dd4a4cb29c45749f64f47 Reviewed-on: https://chromium-review.googlesource.com/c/1450406 Reviewed-by: Ken Buchanan <kenrb@chromium.org> Reviewed-by: Kentaro Hara <haraken@chromium.org> Reviewed-by: Alexander Timin <altimin@chromium.org> Reviewed-by: John Abd-El-Malek <jam@chromium.org> Commit-Queue: Dave Tapuska <dtapuska@chromium.org> Cr-Commit-Position: refs/heads/master@{#629822} -- wpt-commits: d31a2f38a2c7159a88ca190cde7826b91299c64f wpt-pr: 15234
2019-02-18 19:25:29 +00:00 · 2019-02-18 19:25:29 +00:00 · 5a49cd06da
--- a/testing/web-platform/tests/lifecycle/child-display-none.tentative.html
+++ b/testing/web-platform/tests/lifecycle/child-display-none.tentative.html
@ -0,0 +1,35 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>Child frame marked as frozen</title>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<body>
+<script>
+async_test((t) => {
+
+  var child = document.createElement('iframe');
+
+  var loaded = false;
+  var frozen = false;
+
+  window.addEventListener('message', t.step_func((e) => {
+    if (e.data == "load") {
+      loaded = true;
+    } else if (e.data == "freeze") {
+      assert_true(loaded);
+      frozen = true;
+      child.style = "display: block";
+    } else if (e.data == "resume") {
+      assert_true(loaded);
+      assert_true(frozen);
+      t.done();
+    }
+  }));
+
+  child.src = "resources/subframe.html";
+  document.body.appendChild(child);
+  child.style = "display: none";
+}, "Child frame frozen");
+
+</script>
+</body>
--- a/testing/web-platform/tests/lifecycle/resources/subframe.html
+++ b/testing/web-platform/tests/lifecycle/resources/subframe.html
@ -0,0 +1,16 @@
+<!DOCTYPE html>
+<meta charset="utf-8">
+<script>
+window.addEventListener('load', () => {
+  window.parent.postMessage('load');
+});
+
+document.addEventListener('freeze', () => {
+  window.parent.postMessage('freeze');
+});
+
+document.addEventListener('resume', () => {
+  window.parent.postMessage('resume');
+});
+
+</script>