Bug 1651253 [wpt PR 24508] - Remove containerName truncation, switch to use atomicString, a=testonly

Automatic update from web-platform-tests Remove containerName truncation, switch to use atomicString As mentioned in Bug 1030396, the containerName attribute was first added in https://codereview.chromium.org/2515993002/ and it was truncated to 100 chars. The spec does not mention this truncation anywhere, see https://w3c.github.io/longtasks/. In this PR, we removed undocumented containerName truncation, and changed member variables to use atomicString instead of String. Bug: 1030396 Change-Id: Ie1e7e6d7d1878ca16091a5f4db316d9c59368be0 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276680 Commit-Queue: Qiaofei Ye <qiaye@microsoft.com> Commit-Queue: Nicolás Peña Moreno <npm@chromium.org> Reviewed-by: Nicolás Peña Moreno <npm@chromium.org> Cr-Commit-Position: refs/heads/master@{#786484} -- wpt-commits: 1378543f15bedb0365455795053c3b5cd1f08581 wpt-pr: 24508
2020-07-09 14:19:22 +00:00 · 2020-07-09 14:19:22 +00:00 · cf9c4d31da
--- a/testing/web-platform/tests/longtask-timing/containerNames.html
+++ b/testing/web-platform/tests/longtask-timing/containerNames.html
@ -0,0 +1,54 @@
+<!DOCTYPE HTML>
+<meta charset=utf-8>
+<title>LongTask Timing: long tasks in long-name iframe containers</title>
+<body>
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<h1>Longtasks in iframe</h1>
+<div id="log"></div>
+<script>
+const longContainerName = 'iframeWithLongNameMoreThan100CharactersSpaceHolderSpaceHolderSpaceHolderSpaceHolderSpaceHolderSpaceHolder';
+
+promise_test(async t => {
+assert_implements(window.PerformanceLongTaskTiming, 'Longtasks are not supported.');
+const initialTime = performance.now();
+return new Promise(resolve => {
+    const observer = new PerformanceObserver(t.step_func(entryList => {
+        const entries = entryList.getEntries();
+        assert_equals(entries.length, 1,
+            'Exactly one entry is expected.');
+        const longtask = entries[0];
+        assert_equals(longtask.entryType, 'longtask');
+        if (longtask.name == 'self' ||
+            longtask.name == 'multiple-contexts' ||
+            longtask.name == 'unknown')
+            return;
+        assert_equals(longtask.name, 'same-origin-descendant');
+        assert_greater_than(longtask.duration, 50);
+        assert_greater_than_equal(longtask.startTime, initialTime);
+        const currentTime = performance.now();
+        assert_less_than_equal(longtask.startTime, currentTime);
+        // Assert the TaskAttributionTiming entry in attribution.
+        assert_equals(longtask.attribution.length, 1,
+            'Exactly one attribution entry is expected');
+        const attribution = longtask.attribution[0];
+        assert_equals(attribution.entryType, 'taskattribution');
+        assert_equals(attribution.name, 'unknown');
+        assert_equals(attribution.duration, 0);
+        assert_equals(attribution.startTime, 0);
+        assert_equals(attribution.containerId, longContainerName + '-id');
+        assert_equals(attribution.containerName, longContainerName + '-name');
+        assert_equals(attribution.containerSrc, 'resources/subframe-with-longtask.html');
+        observer.disconnect();
+        resolve();
+    }));
+    observer.observe({entryTypes: ['longtask']});
+    const iframe = document.createElement('iframe');
+    iframe.id = longContainerName + '-id';
+    iframe.name = longContainerName + '-name';
+    iframe.src = 'resources/subframe-with-longtask.html';
+    document.body.appendChild(iframe);
+});
+}, `Performance longtask entries in ${longContainerName} are observable in parent.`);
+</script>
+</body>