Adding upstream version 115.8.0esr.upstream/115.8.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 12 insertions, 0 deletions

diff --git a/testing/web-platform/tests/performance-timeline/observer-buffered-false.any.js b/testing/web-platform/tests/performance-timeline/observer-buffered-false.any.js
new file mode 100644
index 0000000000..a28100b0fd
--- /dev/null
+++ b/testing/web-platform/tests/performance-timeline/observer-buffered-false.any.js
@@ -0,0 +1,12 @@
+async_test(t => {
+  performance.mark('foo');
+  // Use a timeout to ensure the remainder of the test runs after the entry is created.
+  t.step_timeout(() => {
+    // Observer with buffered flag set to false should not see entry.
+    new PerformanceObserver(() => {
+      assert_unreached('Should not have observed any entry!');
+    }).observe({type: 'mark', buffered: false});
+    // Use a timeout to give time to the observer.
+    t.step_timeout(t.step_func_done(() => {}), 100);
+  }, 0);
+}, 'PerformanceObserver without buffered flag set to false cannot see past entries.');