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diff --git a/chrome/browser/resources/chromeos/braille_ime/externs.js b/chrome/browser/resources/chromeos/braille_ime/externs.js
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+++ b/chrome/browser/resources/chromeos/braille_ime/externs.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 Externs for the braille IME.
+ * @externs
+ */
+
+/**
+ * @const
+ */
+chrome.input = {};
+
+/** @const */
+chrome.input.ime = {};
+
+/**
+ * @constructor
+ */
+function ChromeInputImeOnKeyEventEvent() {}
+
+/**
+ * @param {function(string, !ChromeKeyboardEvent): (boolean|undefined)} callback
+ * @param {Array.<string>=} opt_extraInfoSpec
+ */
+ChromeInputImeOnKeyEventEvent.prototype.addListener =
+    function(callback, opt_extraInfoSpec) {};
+
+/**
+ * @param {!Object.<string,(string|number)>} parameters An object with
+ *     'contextID' (number) and 'text' (string) keys.
+ * @param {function(boolean): void=} opt_callback Callback function.
+ */
+chrome.input.ime.commitText = function(parameters, opt_callback) {};
+
+/**
+ * @param {!Object.<string,(string|number)>} parameters An object with
+ *     'contextID' (number) and 'text' (string) keys.
+ * @param {function(boolean): void=} opt_callback Callback function.
+ */
+chrome.input.ime.deleteSurroundingText = function(parameters, opt_callback) {};
+
+/**
+ * @param {{engineID: string, items: Array.<chrome.input.ime.MenuItem>}}
+ *     parameters
+ * @param {function()=} opt_callback
+ */
+chrome.input.ime.setMenuItems = function(parameters, opt_callback) {};
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onActivate;
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onBlur;
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onDeactivated;
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onFocus;
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onInputContextUpdate;
+
+/** @type {!ChromeInputImeOnKeyEventEvent} */
+chrome.input.ime.onKeyEvent;
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onMenuItemActivated;
+
+/** @type {!ChromeEvent} */
+chrome.input.ime.onReset;
+
+/**
+ * @const
+ */
+chrome.runtime = {};
+
+/** @type {!Object|undefined} */
+chrome.runtime.lastError = {};
+
+/**
+ * @param {string|!Object.<string>=} opt_extensionIdOrConnectInfo Either the
+ *     extensionId to connect to, in which case connectInfo params can be
+ *     passed in the next optional argument, or the connectInfo params.
+ * @param {!Object.<string>=} opt_connectInfo The connectInfo object,
+ *     if arg1 was the extensionId to connect to.
+ * @return {!Port} New port.
+ */
+chrome.runtime.connect = function(
+    opt_extensionIdOrConnectInfo, opt_connectInfo) {};
+
+/**
+ * @constructor
+ */
+function Port() {}
+
+/** @type {ChromeEvent} */
+Port.prototype.onDisconnect;
+
+/** @type {ChromeEvent} */
+Port.prototype.onMessage;
+
+/**
+ * @param {Object.<string>} obj Message object.
+ */
+Port.prototype.postMessage = function(obj) {};
+
+/**
+ * Note: as of 2012-04-12, this function is no longer documented on
+ * the public web pages, but there are still existing usages.
+ */
+Port.prototype.disconnect = function() {};
+
+/**
+ * @constructor
+ */
+function ChromeEvent() {}
+
+/** @param {Function} callback */
+ChromeEvent.prototype.addListener = function(callback) {};
+
+/**
+ * @constructor
+ */
+function ChromeKeyboardEvent() {}
+
+/** @type {string} */
+ChromeKeyboardEvent.prototype.type;
+
+/** @type {string} */
+ChromeKeyboardEvent.prototype.code;
+
+/** @type {boolean} */
+ChromeKeyboardEvent.prototype.altKey;
+
+/** @type {boolean} */
+ChromeKeyboardEvent.prototype.ctrlKey;
+
+/** @type {boolean} */
+ChromeKeyboardEvent.prototype.shiftKey;
+
+/**
+ * @constructor
+ */
+function InputContext() {}
+
+/** @type {number} */
+InputContext.prototype.contextID;
+
+/** @type {string} */
+InputContext.prototype.type;
+
+/**
+ * @typedef {{
+ *     id: string,
+ *     label: (string|undefined),
+ *     style: string,
+ *     visible: (boolean|undefined),
+ *     checked: (boolean|undefined),
+ *     enabled: (boolean|undefined)
+ * }}
+ */
+chrome.input.ime.MenuItem;
+
+/**
+ * @type {Object}
+ */
+var localStorage;