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diff --git a/chromium/chrome/browser/resources/chromeos/chromevox/host/interface/abstract_host.js b/chromium/chrome/browser/resources/chromeos/chromevox/host/interface/abstract_host.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 Abstract interface to methods that differ depending on the
+ * host platform.
+ *
+ */
+
+goog.provide('cvox.AbstractHost');
+
+
+/**
+ * @constructor
+ */
+cvox.AbstractHost = function() {
+};
+
+
+/**
+ * @enum {number}
+ */
+cvox.AbstractHost.State = {
+  ACTIVE: 0,
+  INACTIVE: 1,
+  KILLED: 2
+};
+
+
+/**
+ * Do all host-platform-specific initialization.
+ */
+cvox.AbstractHost.prototype.init = function() {
+};
+
+
+/**
+ * Used to reinitialize ChromeVox if initialization fails.
+ */
+cvox.AbstractHost.prototype.reinit = function() {
+};
+
+
+/**
+ * Executed on page load.
+ */
+cvox.AbstractHost.prototype.onPageLoad = function() {
+};
+
+
+/**
+ * Sends a message to the background page (if it exists) for this host.
+ * @param {Object} message The message to pass to the background page.
+ */
+cvox.AbstractHost.prototype.sendToBackgroundPage = function(message) {
+};
+
+
+/**
+ * Returns the absolute URL to the API source.
+ * @return {string} The URL.
+ */
+cvox.AbstractHost.prototype.getApiSrc = function() {
+  return '';
+};
+
+
+/**
+ * Return the absolute URL to the given file.
+ * @param {string} path The URL suffix.
+ * @return {string} The full URL.
+ */
+cvox.AbstractHost.prototype.getFileSrc = function(path) {
+  return '';
+};
+
+
+/**
+ * @return {boolean} True if the host has a Tts callback.
+ */
+cvox.AbstractHost.prototype.hasTtsCallback = function() {
+  return true;
+};
+
+
+/**
+ * @return {boolean} True if the TTS has been loaded.
+ */
+cvox.AbstractHost.prototype.ttsLoaded = function() {
+  return true;
+};
+
+
+/**
+ * @return {boolean} True if the ChromeVox is supposed to intercept and handle
+ * mouse clicks for the platform, instead of just letting the clicks fall
+ * through.
+ *
+ * Note: This behavior is only needed for Android because of the way touch
+ * exploration and double-tap to click is implemented by the platform.
+ */
+cvox.AbstractHost.prototype.mustRedispatchClickEvent = function() {
+  return false;
+};
+
+/**
+ * Activate or deactivate ChromeVox on this host.
+ * @param {boolean} active The desired state; true for active, false for
+ * inactive.
+ */
+cvox.AbstractHost.prototype.activateOrDeactivateChromeVox = function(active) {
+  this.onStateChanged_(active ? cvox.AbstractHost.State.ACTIVE :
+      cvox.AbstractHost.State.INACTIVE);
+};
+
+
+/**
+ * Kills ChromeVox on this host.
+ */
+cvox.AbstractHost.prototype.killChromeVox = function() {
+  this.onStateChanged_(cvox.AbstractHost.State.KILLED);
+};
+
+
+/**
+ * Helper managing the three states of ChromeVox --
+ * active: all event listeners registered
+ * inactive: only key down listener registered
+ * killed: no listeners registered
+ * @param {cvox.AbstractHost.State} state The new state.
+ * @private
+ */
+cvox.AbstractHost.prototype.onStateChanged_ = function(state) {
+  var active = state == cvox.AbstractHost.State.ACTIVE;
+  if (active == cvox.ChromeVox.isActive) {
+    return;
+  }
+  cvox.ChromeVoxEventWatcher.cleanup(window);
+  switch (state) {
+    case cvox.AbstractHost.State.ACTIVE:
+      cvox.ChromeVox.isActive = true;
+      cvox.ChromeVox.navigationManager.showOrHideIndicator(true);
+      cvox.ChromeVoxEventWatcher.init(window);
+      if (document.activeElement) {
+        var speakNodeAlso = document.hasFocus() && !document.webkitHidden;
+        cvox.ApiImplementation.syncToNode(
+            document.activeElement, speakNodeAlso);
+      } else {
+        cvox.ChromeVox.navigationManager.updateIndicator();
+      }
+      break;
+    case cvox.AbstractHost.State.INACTIVE:
+      cvox.ChromeVox.isActive = false;
+      cvox.ChromeVox.navigationManager.showOrHideIndicator(false);
+      // If ChromeVox is inactive, the event watcher will only listen for key
+      // down events.
+      cvox.ChromeVoxEventWatcher.init(window);
+      break;
+    case cvox.AbstractHost.State.KILLED:
+      cvox.ChromeVox.isActive = false;
+      cvox.ChromeVox.navigationManager.showOrHideIndicator(false);
+      break;
+  }
+};