Bug 1522790 - [wpt] Fix intermittent test failures for short timer. r=whimboo

Depends on D23972

Differential Revision: https://phabricator.services.mozilla.com/D204234

Author: jgraham

testing/web-platform/meta/html/webappapis/timers/setinterval-cross-realm-callback-report-exception.html.ini

@@ -153,7 +153,11 @@
       await new Promise(resolve => t.step_timeout(resolve, 0));
 
       const expected = isDisabledFormControl(element) ? expectedEvents : nonDisabledExpectedEvents;
-      assert_array_equals(observedEvents.map(e => e.type), expected, "Observed events");
+
+      t.step_wait_func_done(() => observedEvents.length > 0,
+        () => assert_array_equals(observedEvents.map(e => e.type), expected, "Observed events"),
+        undefined, 1000, 10);
+      ;
 
       for (const observed of observedEvents) {
         assert_equals(observed.target, target, `${observed.type}.target`)

testing/web-platform/meta/html/webappapis/timers/settimeout-cross-realm-callback-report-exception.html.ini

@@ -23,10 +23,9 @@
     `), 4);
     window.clearThisInterval = () => { frames[0].clearInterval(id); };
 
-    t.step_timeout(() => {
-      assert_array_equals(onerrorCalls, ["frame1"]);
-      t.done();
-    }, 8);
+    t.step_wait_func_done(() => onerrorCalls.length > 0,
+                          () => assert_array_equals(onerrorCalls, ["frame1"]),
+                          undefined, 1000, 10);
   });
 });
 </script>

testing/web-platform/tests/html/semantics/disabled-elements/event-propagate-disabled.tentative.html

@@ -19,10 +19,9 @@
   window.onload = t.step_func(() => {
     frames[0].setTimeout(new frames[1].Function(`throw new parent.frames[2].Error("PASS");`), 4);
 
-    t.step_timeout(() => {
-      assert_array_equals(onerrorCalls, ["frame1"]);
-      t.done();
-    }, 8);
+    t.step_wait_func_done(() => onerrorCalls.length > 0,
+      () => assert_array_equals(onerrorCalls, ["frame1"]),
+      undefined, 1000, 10);
   });
 });
 </script>