DevTools: add console test helpers to new test runner & migrate a console test

third_party/WebKit/Source/devtools/front_end/elements_test_runner/ElementsTestRunner.js

+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview using private properties isn't a Closure violation in tests.
+ * @suppress {accessControls}
+ */
+
+/**
+ * @param {string} idValue
+ * @param {!Function} callback
+ */
+ElementsTestRunner.selectNodeWithId = function(idValue, callback) {
+  callback = TestRunner.safeWrap(callback);
+  function onNodeFound(node) {
+    ElementsTestRunner.selectNode(node).then(callback.bind(null, node));
+  }
+  ElementsTestRunner.nodeWithId(idValue, onNodeFound);
+};
+
+/**
+ * @param {!Object} node
+ * @return {!Promise.<undefined>}
+ */
+ElementsTestRunner.selectNode = function(node) {
+  return Common.Revealer.revealPromise(node);
+};
+
+/**
+ * @param {string} idValue
+ * @param {!Function} callback
+ */
+ElementsTestRunner.nodeWithId = function(idValue, callback) {
+  ElementsTestRunner.findNode(node => node.getAttribute('id') === idValue, callback);
+};
+
+/**
+ * @param {function(!Element): boolean} matchFunction
+ * @param {!Function} callback
+ */
+ElementsTestRunner.findNode = function(matchFunction, callback) {
+  callback = TestRunner.safeWrap(callback);
+  var result = null;
+  var pendingRequests = 0;
+  function processChildren(node) {
+    try {
+      if (result)
+        return;
+
+      var pseudoElementsMap = node.pseudoElements();
+      var pseudoElements = pseudoElementsMap ? pseudoElementsMap.valuesArray() : [];
+      var children = (node.children() || []).concat(node.shadowRoots()).concat(pseudoElements);
+      if (node.templateContent())
+        children.push(node.templateContent());
+      else if (node.importedDocument())
+        children.push(node.importedDocument());
+
+      for (var i = 0; i < children.length; ++i) {
+        var childNode = children[i];
+        if (matchFunction(childNode)) {
+          result = childNode;
+          callback(result);
+          return;
+        }
+        pendingRequests++;
+        childNode.getChildNodes(processChildren.bind(null, childNode));
+      }
+    } finally {
+      pendingRequests--;
+    }
+
+    if (!result && !pendingRequests)
+      callback(null);
+  }
+
+  TestRunner.domModel.requestDocument(doc => {
+    pendingRequests++;
+    doc.getChildNodes(processChildren.bind(null, doc));
+  });
+};