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diff --git a/contexts/data/lib/closure-library/closure/goog/result/result_interface.js b/contexts/data/lib/closure-library/closure/goog/result/result_interface.js
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+// Copyright 2012 The Closure Library Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS-IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+/**
+ * @fileoverview Defines an interface that represents a Result.
+ */
+
+goog.provide('goog.result.Result');
+
+goog.require('goog.debug.Error');
+
+
+
+/**
+ * A Result object represents a value returned by an asynchronous
+ * operation at some point in the future (e.g. a network fetch). This is akin
+ * to a 'Promise' or a 'Future' in other languages and frameworks.
+ *
+ * @interface
+ */
+goog.result.Result = function() {};
+
+
+/**
+ * Attaches handlers to be called when the value of this Result is available.
+ *
+ * @param {!function(!goog.result.Result)} handler The function called when
+ *     the value is available. The function is passed the Result object as the
+ *     only argument.
+ */
+goog.result.Result.prototype.wait = function(handler) {};
+
+
+/**
+ * The States this object can be in.
+ *
+ * @enum {string}
+ */
+goog.result.Result.State = {
+  /** The operation was a success and the value is available. */
+  SUCCESS: 'success',
+
+  /** The operation resulted in an error. */
+  ERROR: 'error',
+
+  /** The operation is incomplete and the value is not yet available. */
+  PENDING: 'pending'
+};
+
+
+/**
+ * @return {!goog.result.Result.State} The state of this Result.
+ */
+goog.result.Result.prototype.getState = function() {};
+
+
+/**
+ * @return {*} The value of this Result. Will return undefined if the Result is
+ *     pending or was an error.
+ */
+goog.result.Result.prototype.getValue = function() {};
+
+
+/**
+ * @return {*} The error slug for this Result. Will return undefined if the
+ *     Result was a success, the error slug was not set, or if the Result is
+ *     pending.
+ */
+goog.result.Result.prototype.getError = function() {};
+
+
+/**
+ * Cancels the current Result, invoking the canceler function, if set.
+ *
+ * @return {boolean} Whether the Result was canceled.
+ */
+goog.result.Result.prototype.cancel = function() {};
+
+
+/**
+ * @return {boolean} Whether this Result was canceled.
+ */
+goog.result.Result.prototype.isCanceled = function() {};
+
+
+
+/**
+ * The value to be passed to the error handlers invoked upon cancellation.
+ * @constructor
+ * @param {string=} opt_msg The error message for CancelError.
+ * @extends {goog.debug.Error}
+ */
+goog.result.Result.CancelError = function(opt_msg) {
+  var msg = opt_msg || 'Result canceled';
+  goog.base(this, msg);
+};
+goog.inherits(goog.result.Result.CancelError, goog.debug.Error);