[DevTools] New harness for inspector-protocol layout tests

third_party/WebKit/LayoutTests/inspector-protocol/timeline/timeline-dispatchEvent.js

+(async function(testRunner) {
+  let {page, session, dp} = await testRunner.startHTML(`
+    <div id='my-div'></div>
+  `, '');
+
+  function performAction() {
+    var div = document.querySelector('#my-div');
+    div.addEventListener('click', function(e) {  }, false);
+    div.click();
+
+    var iframe = document.createElement('iframe');
+    div.appendChild(iframe);
+    return new Promise(resolve => {
+      iframe.onload = resolve;
+      iframe.src = 'blank.html';
+    });
+  }
+
+  var tracingHelper = (await testRunner.loadScript('../resources/tracing-test.js'))(testRunner, session);
+  await session.evaluate(performAction.toString());
+  tracingHelper.invokeAsyncWithTracing('performAction', finish);
+
+  function finish(devtoolsEvents) {
+    function windowEventFilter(type, e) {
+      return e.name === 'EventDispatch' && e.args.data.type === type;
+    };
+
+    var windowEventNames = [ 'click', 'beforeunload', 'unload', 'load' ];
+    for (var i = 0; i < windowEventNames.length; i++) {
+      var eventName = windowEventNames[i];
+      var events = devtoolsEvents.filter(windowEventFilter.bind(this, eventName));
+      if (events.length >= 1)
+        testRunner.log('SUCCESS: found ' + eventName + ' event');
+      else
+        fail(eventName + ' event is missing', devtoolsEvents);
+    }
+
+    testRunner.completeTest();
+  }
+
+  function fail(message, devtoolsEvents) {
+    var formattedEvents = devtoolsEvents.map(function(e) {
+      return e.name + (e.args.data ? '(' + e.args.data.type + ')' : '');
+    });
+    testRunner.log('FAIL: ' + message + ' devtools.timeline events: ' + JSON.stringify(formattedEvents, null, 2));
+  }
+})