diff --git a/front_end/common/TestBase.js b/front_end/common/TestBase.js
index 5b9cb4bef7..48fecf7b69 100644
--- a/front_end/common/TestBase.js
+++ b/front_end/common/TestBase.js
@@ -79,6 +79,7 @@ WebInspector.TestBase.prototype.releaseControl = function()
         clearTimeout(this.timerId_);
         this.timerId_ = -1;
     }
+    this.controlTaken_ = false;
     this.reportOk_();
 };
 
@@ -107,7 +108,7 @@ WebInspector.TestBase.prototype.reportFailure_ = function(error)
 
 /**
  * Run specified test on a fresh instance of the test suite.
- * @param {string} name Name of a test method from implementation class.
+ * @param {Array<string>} args method name followed by its parameters.
  */
 WebInspector.TestBase.prototype.dispatch = function(args)
 {
@@ -122,6 +123,19 @@ WebInspector.TestBase.prototype.dispatch = function(args)
 };
 
 
+/**
+ * Wrap an async method with TestBase.{takeControl(), releaseControl()}
+ * and invoke TestBase.reportOk_ upon completion.
+ * @param {Array<string>} args method name followed by its parameters.
+ */
+WebInspector.TestBase.prototype.waitForAsync = function(var_args)
+{
+    var args = Array.prototype.slice.call(arguments);
+    this.takeControl();
+    args.push(this.releaseControl.bind(this));
+    this.dispatch(args);
+};
+
 /**
  * Overrides the method with specified name until it's called first time.
  * @param {!Object} receiver An object whose method to override.
diff --git a/front_end/main/Tests.js b/front_end/main/Tests.js
index e63ad97079..4e3588faf3 100644
--- a/front_end/main/Tests.js
+++ b/front_end/main/Tests.js
@@ -47,6 +47,7 @@ function createTestSuite(domAutomationController)
 function TestSuite()
 {
     WebInspector.TestBase.call(this, domAutomationController);
+    this._asyncInvocationId = 0;
 };
 
 TestSuite.prototype = {
@@ -651,10 +652,9 @@ TestSuite.prototype.waitForTestResultsInConsole = function()
     this.takeControl();
 };
 
-TestSuite.prototype.invokeAsyncWithTimeline_ = function(functionName, callback)
+TestSuite.prototype.startTimeline = function(callback)
 {
-    var test = this;
-    test.showPanel("timeline").then(function() {
+    this.showPanel("timeline").then(function() {
         WebInspector.panels.timeline._model.addEventListener(WebInspector.TimelineModel.Events.RecordingStarted, onRecordingStarted);
         WebInspector.panels.timeline._toggleRecording();
     });
@@ -662,32 +662,77 @@ TestSuite.prototype.invokeAsyncWithTimeline_ = function(functionName, callback)
     function onRecordingStarted()
     {
         WebInspector.panels.timeline._model.removeEventListener(WebInspector.TimelineModel.Events.RecordingStarted, onRecordingStarted);
-        test.evaluateInConsole_(functionName + "(function() { console.log('DONE'); });", function() {});
-        WebInspector.multitargetConsoleModel.addEventListener(WebInspector.ConsoleModel.Events.MessageAdded, onConsoleMessage);
+        callback();
+    }
+}
+
+TestSuite.prototype.stopTimeline = function(callback)
+{
+    WebInspector.panels.timeline._model.addEventListener(WebInspector.TimelineModel.Events.RecordingStopped, onRecordingStopped);
+    WebInspector.panels.timeline._toggleRecording();
+    function onRecordingStopped()
+    {
+        WebInspector.panels.timeline._model.removeEventListener(WebInspector.TimelineModel.Events.RecordingStopped, onRecordingStopped);
+        callback();
     }
+}
+
+TestSuite.prototype.invokePageFunctionAsync = function(functionName, opt_args, callback_is_always_last)
+{
+    var callback = arguments[arguments.length - 1];
+    var doneMessage = `DONE: ${functionName}.${++this._asyncInvocationId}`;
+    var argsString = arguments.length < 3 ? "" : Array.prototype.slice.call(arguments, 1, -1).map(arg => JSON.stringify(arg)).join(",") + ",";
+    this.evaluateInConsole_(`${functionName}(${argsString} function() { console.log('${doneMessage}'); });`, function() {});
+    WebInspector.multitargetConsoleModel.addEventListener(WebInspector.ConsoleModel.Events.MessageAdded, onConsoleMessage);
 
     function onConsoleMessage(event)
     {
         var text = event.data.messageText;
-        if (text === "DONE") {
+        if (text === doneMessage) {
             WebInspector.multitargetConsoleModel.removeEventListener(WebInspector.ConsoleModel.Events.MessageAdded, onConsoleMessage);
-            pageActionsDone();
+            callback();
         }
     }
+}
 
-    function pageActionsDone()
+TestSuite.prototype.invokeAsyncWithTimeline_ = function(functionName, callback)
+{
+    var test = this;
+
+    this.startTimeline(onRecordingStarted);
+
+    function onRecordingStarted()
     {
-        WebInspector.panels.timeline._model.addEventListener(WebInspector.TimelineModel.Events.RecordingStopped, onRecordingStopped);
-        WebInspector.panels.timeline._toggleRecording();
+        test.invokePageFunctionAsync(functionName, pageActionsDone);
     }
 
-    function onRecordingStopped()
+    function pageActionsDone()
     {
-        WebInspector.panels.timeline._model.removeEventListener(WebInspector.TimelineModel.Events.RecordingStopped, onRecordingStopped);
-        callback();
+        test.stopTimeline(callback);
     }
 };
 
+TestSuite.prototype.enableExperiment = function(name)
+{
+    Runtime.experiments.enableForTest(name);
+}
+
+TestSuite.prototype.checkInputEventsPresent = function()
+{
+    var expectedEvents = new Set(arguments);
+    var model = WebInspector.panels.timeline._model;
+    var asyncEvents = model.mainThreadAsyncEvents();
+    var input = asyncEvents.get(WebInspector.TimelineUIUtils.asyncEventGroups().input) || [];
+    var prefix = "InputLatency::";
+    for (var e of input) {
+        if (!e.name.startsWith(prefix))
+            continue;
+        expectedEvents.delete(e.name.substr(prefix.length));
+    }
+    if (expectedEvents.size)
+        throw "Some expected events are not found: " + Array.from(expectedEvents.keys()).join(",");
+}
+
 /**
  * Serializes array of uiSourceCodes to string.
  * @param {!Array.<!WebInspectorUISourceCode>} uiSourceCodes