Reland "[EventTiming] Fix programmatic click test"

event-timing/programmatic-click-not-observed.html

@@ -8,7 +8,7 @@
 <script src=/resources/testdriver.js></script>
 <script src=/resources/testdriver-vendor.js></script>
 
-<script src=resources/event-timing-support.js></script>
+<script src=resources/event-timing-test-utils.js></script>
 <script>
   let delayCalled = false;
   let beforeClick;
@@ -19,15 +19,19 @@
   }
   async_test(function(t) {
     const observer = new PerformanceObserver(t.step_func_done((entryList) => {
-      const entries = entryList.getEntries().filter(e => e.name === 'click');
+      const entries = entryList.getEntries().filter(e => e.name === 'mousedown');
       // There must only be one click entry: from the clickAndBlockMain() call.
       assert_equals(entries.length, 1);
       const entry = entries[0];
       // This ensures that the entry is exposing timing from the second click, i.e.
       // the one from the clickAndBlockMain() call.
       assert_greater_than_equal(entry.processingStart, beforeClick);
+      // Check that the first input entry was also from the second click.
+      const firstInput = performance.getEntriesByType('firstInput');
+      assert_equals(firstInput.length, 1);
+      assert_greater_than_equal(firstInput[0].processingStart, beforeClick);
     }));
-    observer.observe({entryTypes: ['firstInput', 'event']});
+    observer.observe({entryTypes: ['event']});
     document.getElementById('div').click();
     // Take the timestamp after the programmatic click but before the next click.
     beforeClick = performance.now();