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diff --git a/chromium/chrome/browser/resources/chromeos/chromevox/host/interface/abstract_mathjax.js b/chromium/chrome/browser/resources/chromeos/chromevox/host/interface/abstract_mathjax.js
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+// Copyright 2014 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 Implentation of ChromeVox's bridge to MathJax.
+ *
+ */
+
+goog.provide('cvox.AbstractMathJax');
+
+goog.require('cvox.MathJaxInterface');
+
+
+/**
+ * Creates a new instance.
+ * @constructor
+ * @implements {cvox.MathJaxInterface}
+ */
+cvox.AbstractMathJax = function() {
+};
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.isMathjaxActive = goog.abstractMethod;
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.getAllJax = goog.abstractMethod;
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.registerSignal = goog.abstractMethod;
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.getTex = goog.abstractMethod;
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.getAsciiMath = goog.abstractMethod;
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.injectScripts = goog.abstractMethod;
+
+
+/**
+ * @override
+ */
+cvox.AbstractMathJax.prototype.configMediaWiki = goog.abstractMethod;
+
+
+/**
+ * Get MathML represententations for all images that have latex alt text.
+ * @param {function(Node, string)} callback A function taking a MathML node and
+ * an id string.
+ */
+cvox.AbstractMathJax.prototype.getAllTexs = function(callback) {
+  var allTexs = document.
+      querySelectorAll(cvox.DomUtil.altMathQuerySelector('tex'));
+  for (var i = 0, tex; tex = allTexs[i]; i++) {
+    this.getTex(callback, tex);
+  }
+};
+
+
+/**
+ * Get MathML represententations for all images that have asciimath alt text.
+ * @param {function(Node, string)} callback A function taking a MathML node and
+ * an id string.
+ */
+cvox.AbstractMathJax.prototype.getAllAsciiMaths = function(callback) {
+  var allAsciiMaths = document.
+      querySelectorAll(cvox.DomUtil.altMathQuerySelector('asciimath'));
+  for (var i = 0, tex; tex = allAsciiMaths[i]; i++) {
+    this.getAsciiMath(callback, tex);
+  }
+};
+
+
+/**
+ * Converts a XML markup string to a DOM node and applies a callback function.
+ * The function is generally used in the context of retrieving a MathJax
+ * element's MathML representation and converting it from a string. The callback
+ * is therefore use by MathJax internally in case the requested MathML
+ * representation is not ready yet.
+ * @param {function(Node, string)} callback A function taking a node and an id
+ * string.
+ * @param {string} mml The MathML string.
+ * @param {string} id The Mathjax node id.
+ */
+cvox.AbstractMathJax.prototype.convertMarkupToDom = function(
+    callback, mml, id) {
+  if (mml) {
+    var dp = new DOMParser;
+    var cleanMml = mml.replace(/>\s+</g, '><');
+    callback(dp.parseFromString(cleanMml, 'text/xml').firstChild, id);
+  }
+};