[DevTools] New harness for inspector-protocol layout tests

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

+(async function() {
+  let {page, session, Protocol} = await InspectorTest.startHTML(`
+    <div id='myDiv'>DIV</div>
+  `, '');
+
+  function performActions() {
+    var callback;
+    var promise = new Promise((fulfill) => callback = fulfill);
+    var timerId = setTimeout(function() {
+      callback({timerId: timerId, timerId2: timerId2});
+    }, 0);
+
+    var timerId2 = setTimeout(function() { }, 0);
+    clearTimeout(timerId2);
+    return promise;
+  }
+
+  (await InspectorTest.loadScript('../resources/tracing-test.js'))(session);
+  await session.evaluate(performActions.toString());
+  InspectorTest.invokeAsyncWithTracing('performActions', finish);
+
+  function finish(devtoolsEvents, data) {
+    var firedTimerId = data.timerId;
+    var removedTimerId = data.timerId2;
+    InspectorTest.log('SUCCESS: testFunctionTimerFired');
+
+    function hasTimerId(id, e) { return e.args.data.timerId === id}
+
+    var installTimer1 = InspectorTest.findEvent('TimerInstall', 'I', hasTimerId.bind(this, firedTimerId));
+    var installTimer2 = InspectorTest.findEvent('TimerInstall', 'I', hasTimerId.bind(this, removedTimerId));
+
+    InspectorTest.log('TimerInstall has frame: ' + !!installTimer1.args.data.frame);
+    InspectorTest.log('TimerInstall frames match: ' + (installTimer1.args.data.frame === installTimer2.args.data.frame));
+
+    InspectorTest.findEvent('TimerRemove', 'I', hasTimerId.bind(this, removedTimerId));
+    InspectorTest.findEvent('TimerFire', 'X', hasTimerId.bind(this, firedTimerId));
+
+    InspectorTest.log('SUCCESS: found all expected events.');
+    InspectorTest.completeTest();
+  }
+})();