[DevTools] New harness for inspector-protocol layout tests

third_party/WebKit/LayoutTests/inspector-protocol/accessibility/accessibility-aria-1.1.js

+(async function(testRunner) {
+  let {page, session, dp} = await testRunner.startHTML(`
+    <input data-dump aria-errormessage='err'>
+    <h3 id='err'>This text field has an error!</h3>
+
+    <img data-dump aria-details='d1 d2' aria-label='Label'>
+    <div id='d1'>Details 1</div>
+    <div id='d2'>Details 2</div>
+
+    <button data-dump aria-keyshortcuts='Ctrl+A'>Select All</button>
+
+    <input data-dump type='checkbox' aria-roledescription='Lightswitch' checked>
+  `, '');
+
+  var dumpAccessibilityNodesBySelectorAndCompleteTest =
+      (await testRunner.loadScript('../resources/accessibility-dumpAccessibilityNodes.js'))(testRunner, session);
+
+  var msg = await dp.DOM.getDocument();
+  dumpAccessibilityNodesBySelectorAndCompleteTest('[data-dump]', false, msg);
+})