[DevTools] New harness for inspector-protocol layout tests

third_party/WebKit/LayoutTests/inspector-protocol/timeline/page-frames.js

+(async function(testRunner) {
+  let {page, session, dp} = await testRunner.startHTML(`
+    <iframe src='data:text/html,<script>window.foo = 42</script>' name='frame0'></iframe>
+  `, '');
+
+  function performActions() {
+    var frame1 = document.createElement('iframe');
+    frame1.name = 'Frame No. 1';
+    document.body.appendChild(frame1);
+    frame1.contentWindow.document.write('console.log("frame2")');
+
+    var frame2 = document.createElement('iframe');
+    frame2.src = 'blank.html';
+    document.body.appendChild(frame2);
+
+    return new Promise(fulfill => { frame2.addEventListener('load', fulfill, false) });
+  }
+
+  var tracingHelper = (await testRunner.loadScript('../resources/tracing-test.js'))(testRunner, session);
+  await session.evaluate(performActions.toString());
+  tracingHelper.invokeAsyncWithTracing('performActions', finish);
+
+  function finish(devtoolsEvents, data) {
+    testRunner.log('Frames in TracingStartedInPage');
+    var tracingStarted = tracingHelper.findEvent('TracingStartedInPage', 'I');
+    for (var frame of tracingStarted.args['data']['frames'] || [])
+        dumpFrame(frame);
+
+    testRunner.log('Frames in CommitLoad events');
+    var commitLoads = tracingHelper.findEvents('CommitLoad', 'X');
+    for (var event of commitLoads)
+        dumpFrame(event.args['data']);
+    testRunner.completeTest();
+   }
+
+  function dumpFrame(frame) {
+    var url = frame.url.replace(/.*\/(([^/]*\/){2}[^/]*$)/, '$1');
+    testRunner.log(`url: ${url} name: ${frame.name} parent: ${typeof frame.parent} nodeId: ${typeof frame.nodeId}`);
+  }
+})