Add blink_perf.html_to_dom benchmark.

third_party/WebKit/PerformanceTests/HTMLToDOM/dom/bindings/fakedomparserbindings.js

+// Copyright 2016 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.
+"use strict";
+
+(function(exports) {
+
+class FakeNode {
+  constructor() {
+    this.parentNode = null;
+    this.nextSibling = null;
+    this.previousSibling = null;
+  }
+  contains(other) {
+      while (other && other != this)
+        other = other.parentNode;
+      return other === this;
+  }
+  remove() {
+    if (!this.parentNode)
+      return;
+    if (this.nextSibling)
+      this.nextSibling._previousSibling = this._previousSibling;
+    if (this.previousSibling)
+      this.previousSibling._nextSibling = this._nextSibling;
+    this._parentNode = null;
+    this._nextSibling = null;
+    this._previousSibling = null;
+  }
+}
+
+class FakeParentNode extends FakeNode {
+  constructor() {
+    super();
+    this.firstChild = null;
+    this.lastChild = null;
+  }
+  appendChild(node) {
+    if (node.contains(this))
+      throw new Error("HierarchyRequestError");
+    node.remove();
+    node.parentNode = this;
+    node.previousSibling = this.lastChild;
+    if (this.lastChild)
+      this.lastChild.nextSibling = node;
+    this.lastChild = node;
+    if (!this.firstChild)
+      this.firstChild = node;
+    return node;
+  }
+}
+
+class FakeDocumentFragment extends FakeParentNode {
+}
+
+class FakeElement extends FakeParentNode {
+  constructor(tagName) {
+    super();
+    this.tagName = tagName;
+    this.attributes = new Map();
+    this.children = [];
+  }
+  setAttribute(name, value) {
+    this.attributes.set(name, value);
+  }
+}
+
+class FakeText extends FakeNode {
+  constructor(value) {
+    super();
+    this.value = value;
+  }
+}
+
+class FakeDomParserBindings {
+  static setAttribute(element, name, value) {
+    element.setAttribute(name, value);
+  }
+
+  static appendChild(parent, child) {
+    parent.appendChild(child);
+  }
+
+  static createText(value) {
+    return new FakeText(value);
+  }
+
+  static createElement(tagName) {
+    return new FakeElement(tagName);
+  }
+
+  static createDocumentFragment() {
+    return new FakeDocumentFragment();
+  }
+}
+
+exports.FakeDomParserBindings = FakeDomParserBindings;
+
+})(this);