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diff --git a/contexts/data/lib/closure-library/closure/goog/testing/mockclock.js b/contexts/data/lib/closure-library/closure/goog/testing/mockclock.js
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--- a/contexts/data/lib/closure-library/closure/goog/testing/mockclock.js
+++ /dev/null
@@ -1,506 +0,0 @@
-// Copyright 2007 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 Mock Clock implementation for working with setTimeout,
- * setInterval, clearTimeout and clearInterval within unit tests.
- *
- * Derived from jsUnitMockTimeout.js, contributed to JsUnit by
- * Pivotal Computer Systems, www.pivotalsf.com
- *
- */
-
-goog.provide('goog.testing.MockClock');
-
-goog.require('goog.Disposable');
-goog.require('goog.testing.PropertyReplacer');
-goog.require('goog.testing.events');
-goog.require('goog.testing.events.Event');
-
-
-
-/**
- * Class for unit testing code that uses setTimeout and clearTimeout.
- *
- * NOTE: If you are using MockClock to test code that makes use of
- *       goog.fx.Animation, then you must either:
- *
- * 1. Install and dispose of the MockClock in setUpPage() and tearDownPage()
- *    respectively (rather than setUp()/tearDown()).
- *
- * or
- *
- * 2. Ensure that every test clears the animation queue by calling
- *    mockClock.tick(x) at the end of each test function (where `x` is large
- *    enough to complete all animations).
- *
- * Otherwise, if any animation is left pending at the time that
- * MockClock.dispose() is called, that will permanently prevent any future
- * animations from playing on the page.
- *
- * @param {boolean=} opt_autoInstall Install the MockClock at construction time.
- * @constructor
- * @extends {goog.Disposable}
- */
-goog.testing.MockClock = function(opt_autoInstall) {
-  goog.Disposable.call(this);
-
-  /**
-   * Reverse-order queue of timers to fire.
-   *
-   * The last item of the queue is popped off.  Insertion happens from the
-   * right.  For example, the expiration times for each element of the queue
-   * might be in the order 300, 200, 200.
-   *
-   * @type {Array.<Object>}
-   * @private
-   */
-  this.queue_ = [];
-
-  /**
-   * Set of timeouts that should be treated as cancelled.
-   *
-   * Rather than removing cancelled timers directly from the queue, this set
-   * simply marks them as deleted so that they can be ignored when their
-   * turn comes up.  The keys are the timeout keys that are cancelled, each
-   * mapping to true.
-   *
-   * @type {Object}
-   * @private
-   */
-  this.deletedKeys_ = {};
-
-  if (opt_autoInstall) {
-    this.install();
-  }
-};
-goog.inherits(goog.testing.MockClock, goog.Disposable);
-
-
-/**
- * Default wait timeout for mocking requestAnimationFrame (in milliseconds).
- *
- * @type {number}
- * @const
- */
-goog.testing.MockClock.REQUEST_ANIMATION_FRAME_TIMEOUT = 20;
-
-
-/**
- * Count of the number of timeouts made.
- * @type {number}
- * @private
- */
-goog.testing.MockClock.prototype.timeoutsMade_ = 0;
-
-
-/**
- * PropertyReplacer instance which overwrites and resets setTimeout,
- * setInterval, etc. or null if the MockClock is not installed.
- * @type {goog.testing.PropertyReplacer}
- * @private
- */
-goog.testing.MockClock.prototype.replacer_ = null;
-
-
-/**
- * Map of deleted keys.  These keys represents keys that were deleted in a
- * clearInterval, timeoutid -> object.
- * @type {Object}
- * @private
- */
-goog.testing.MockClock.prototype.deletedKeys_ = null;
-
-
-/**
- * The current simulated time in milliseconds.
- * @type {number}
- * @private
- */
-goog.testing.MockClock.prototype.nowMillis_ = 0;
-
-
-/**
- * Additional delay between the time a timeout was set to fire, and the time
- * it actually fires.  Useful for testing workarounds for this Firefox 2 bug:
- * https://bugzilla.mozilla.org/show_bug.cgi?id=291386
- * May be negative.
- * @type {number}
- * @private
- */
-goog.testing.MockClock.prototype.timeoutDelay_ = 0;
-
-
-/**
- * Installs the MockClock by overriding the global object's implementation of
- * setTimeout, setInterval, clearTimeout and clearInterval.
- */
-goog.testing.MockClock.prototype.install = function() {
-  if (!this.replacer_) {
-    var r = this.replacer_ = new goog.testing.PropertyReplacer();
-    r.set(goog.global, 'setTimeout', goog.bind(this.setTimeout_, this));
-    r.set(goog.global, 'setInterval', goog.bind(this.setInterval_, this));
-    r.set(goog.global, 'clearTimeout', goog.bind(this.clearTimeout_, this));
-    r.set(goog.global, 'clearInterval', goog.bind(this.clearInterval_, this));
-
-    // Replace the requestAnimationFrame functions.
-    this.replaceRequestAnimationFrame_();
-
-    // PropertyReplacer#set can't be called with renameable functions.
-    this.oldGoogNow_ = goog.now;
-    goog.now = goog.bind(this.getCurrentTime, this);
-  }
-};
-
-
-/**
- * Installs the mocks for requestAnimationFrame and cancelRequestAnimationFrame.
- * @private
- */
-goog.testing.MockClock.prototype.replaceRequestAnimationFrame_ = function() {
-  var r = this.replacer_;
-  var requestFuncs = ['requestAnimationFrame',
-                      'webkitRequestAnimationFrame',
-                      'mozRequestAnimationFrame',
-                      'oRequestAnimationFrame',
-                      'msRequestAnimationFrame'];
-
-  var cancelFuncs = ['cancelRequestAnimationFrame',
-                     'webkitCancelRequestAnimationFrame',
-                     'mozCancelRequestAnimationFrame',
-                     'oCancelRequestAnimationFrame',
-                     'msCancelRequestAnimationFrame'];
-
-  for (var i = 0; i < requestFuncs.length; ++i) {
-    if (goog.global && goog.global[requestFuncs[i]]) {
-      r.set(goog.global, requestFuncs[i],
-          goog.bind(this.requestAnimationFrame_, this));
-    }
-  }
-
-  for (var i = 0; i < cancelFuncs.length; ++i) {
-    if (goog.global && goog.global[cancelFuncs[i]]) {
-      r.set(goog.global, cancelFuncs[i],
-          goog.bind(this.cancelRequestAnimationFrame_, this));
-    }
-  }
-};
-
-
-/**
- * Removes the MockClock's hooks into the global object's functions and revert
- * to their original values.
- */
-goog.testing.MockClock.prototype.uninstall = function() {
-  if (this.replacer_) {
-    this.replacer_.reset();
-    this.replacer_ = null;
-    goog.now = this.oldGoogNow_;
-  }
-};
-
-
-/** @override */
-goog.testing.MockClock.prototype.disposeInternal = function() {
-  this.uninstall();
-  this.queue_ = null;
-  this.deletedKeys_ = null;
-  goog.testing.MockClock.superClass_.disposeInternal.call(this);
-};
-
-
-/**
- * Resets the MockClock, removing all timeouts that are scheduled and resets
- * the fake timer count.
- */
-goog.testing.MockClock.prototype.reset = function() {
-  this.queue_ = [];
-  this.deletedKeys_ = {};
-  this.nowMillis_ = 0;
-  this.timeoutsMade_ = 0;
-  this.timeoutDelay_ = 0;
-};
-
-
-/**
- * Sets the amount of time between when a timeout is scheduled to fire and when
- * it actually fires.
- * @param {number} delay The delay in milliseconds.  May be negative.
- */
-goog.testing.MockClock.prototype.setTimeoutDelay = function(delay) {
-  this.timeoutDelay_ = delay;
-};
-
-
-/**
- * @return {number} delay The amount of time between when a timeout is
- *     scheduled to fire and when it actually fires, in milliseconds.  May
- *     be negative.
- */
-goog.testing.MockClock.prototype.getTimeoutDelay = function() {
-  return this.timeoutDelay_;
-};
-
-
-/**
- * Increments the MockClock's time by a given number of milliseconds, running
- * any functions that are now overdue.
- * @param {number=} opt_millis Number of milliseconds to increment the counter.
- *     If not specified, clock ticks 1 millisecond.
- * @return {number} Current mock time in milliseconds.
- */
-goog.testing.MockClock.prototype.tick = function(opt_millis) {
-  if (typeof opt_millis != 'number') {
-    opt_millis = 1;
-  }
-  var endTime = this.nowMillis_ + opt_millis;
-  this.runFunctionsWithinRange_(endTime);
-  this.nowMillis_ = endTime;
-  return endTime;
-};
-
-
-/**
- * @return {number} The number of timeouts that have been scheduled.
- */
-goog.testing.MockClock.prototype.getTimeoutsMade = function() {
-  return this.timeoutsMade_;
-};
-
-
-/**
- * @return {number} The MockClock's current time in milliseconds.
- */
-goog.testing.MockClock.prototype.getCurrentTime = function() {
-  return this.nowMillis_;
-};
-
-
-/**
- * @param {number} timeoutKey The timeout key.
- * @return {boolean} Whether the timer has been set and not cleared,
- *     independent of the timeout's expiration.  In other words, the timeout
- *     could have passed or could be scheduled for the future.  Either way,
- *     this function returns true or false depending only on whether the
- *     provided timeoutKey represents a timeout that has been set and not
- *     cleared.
- */
-goog.testing.MockClock.prototype.isTimeoutSet = function(timeoutKey) {
-  return timeoutKey <= this.timeoutsMade_ && !this.deletedKeys_[timeoutKey];
-};
-
-
-/**
- * Runs any function that is scheduled before a certain time.  Timeouts can
- * be made to fire early or late if timeoutDelay_ is non-0.
- * @param {number} endTime The latest time in the range, in milliseconds.
- * @private
- */
-goog.testing.MockClock.prototype.runFunctionsWithinRange_ = function(
-    endTime) {
-  var adjustedEndTime = endTime - this.timeoutDelay_;
-
-  // Repeatedly pop off the last item since the queue is always sorted.
-  while (this.queue_.length &&
-      this.queue_[this.queue_.length - 1].runAtMillis <= adjustedEndTime) {
-    var timeout = this.queue_.pop();
-
-    if (!(timeout.timeoutKey in this.deletedKeys_)) {
-      // Only move time forwards.
-      this.nowMillis_ = Math.max(this.nowMillis_,
-          timeout.runAtMillis + this.timeoutDelay_);
-      // Call timeout in global scope and pass the timeout key as the argument.
-      timeout.funcToCall.call(goog.global, timeout.timeoutKey);
-      // In case the interval was cleared in the funcToCall
-      if (timeout.recurring) {
-        this.scheduleFunction_(
-            timeout.timeoutKey, timeout.funcToCall, timeout.millis, true);
-      }
-    }
-  }
-};
-
-
-/**
- * Schedules a function to be run at a certain time.
- * @param {number} timeoutKey The timeout key.
- * @param {Function} funcToCall The function to call.
- * @param {number} millis The number of milliseconds to call it in.
- * @param {boolean} recurring Whether to function call should recur.
- * @private
- */
-goog.testing.MockClock.prototype.scheduleFunction_ = function(
-    timeoutKey, funcToCall, millis, recurring) {
-  var timeout = {
-    runAtMillis: this.nowMillis_ + millis,
-    funcToCall: funcToCall,
-    recurring: recurring,
-    timeoutKey: timeoutKey,
-    millis: millis
-  };
-
-  goog.testing.MockClock.insert_(timeout, this.queue_);
-};
-
-
-/**
- * Inserts a timer descriptor into a descending-order queue.
- *
- * Later-inserted duplicates appear at lower indices.  For example, the
- * asterisk in (5,4,*,3,2,1) would be the insertion point for 3.
- *
- * @param {Object} timeout The timeout to insert, with numerical runAtMillis
- *     property.
- * @param {Array.<Object>} queue The queue to insert into, with each element
- *     having a numerical runAtMillis property.
- * @private
- */
-goog.testing.MockClock.insert_ = function(timeout, queue) {
-  // Although insertion of N items is quadratic, requiring goog.structs.Heap
-  // from a unit test will make tests more prone to breakage.  Since unit
-  // tests are normally small, scalability is not a primary issue.
-
-  // Find an insertion point.  Since the queue is in reverse order (so we
-  // can pop rather than unshift), and later timers with the same time stamp
-  // should be executed later, we look for the element strictly greater than
-  // the one we are inserting.
-
-  for (var i = queue.length; i != 0; i--) {
-    if (queue[i - 1].runAtMillis > timeout.runAtMillis) {
-      break;
-    }
-    queue[i] = queue[i - 1];
-  }
-
-  queue[i] = timeout;
-};
-
-
-/**
- * Maximum 32-bit signed integer.
- *
- * Timeouts over this time return immediately in many browsers, due to integer
- * overflow.  Such known browsers include Firefox, Chrome, and Safari, but not
- * IE.
- *
- * @type {number}
- * @private
- */
-goog.testing.MockClock.MAX_INT_ = 2147483647;
-
-
-/**
- * Schedules a function to be called after {@code millis} milliseconds.
- * Mock implementation for setTimeout.
- * @param {Function} funcToCall The function to call.
- * @param {number} millis The number of milliseconds to call it after.
- * @return {number} The number of timeouts created.
- * @private
- */
-goog.testing.MockClock.prototype.setTimeout_ = function(funcToCall, millis) {
-  if (millis > goog.testing.MockClock.MAX_INT_) {
-    throw Error(
-        'Bad timeout value: ' + millis + '.  Timeouts over MAX_INT ' +
-        '(24.8 days) cause timeouts to be fired ' +
-        'immediately in most browsers, except for IE.');
-  }
-  this.timeoutsMade_ = this.timeoutsMade_ + 1;
-  this.scheduleFunction_(this.timeoutsMade_, funcToCall, millis, false);
-  return this.timeoutsMade_;
-};
-
-
-/**
- * Schedules a function to be called every {@code millis} milliseconds.
- * Mock implementation for setInterval.
- * @param {Function} funcToCall The function to call.
- * @param {number} millis The number of milliseconds between calls.
- * @return {number} The number of timeouts created.
- * @private
- */
-goog.testing.MockClock.prototype.setInterval_ = function(funcToCall, millis) {
-  this.timeoutsMade_ = this.timeoutsMade_ + 1;
-  this.scheduleFunction_(this.timeoutsMade_, funcToCall, millis, true);
-  return this.timeoutsMade_;
-};
-
-
-/**
- * Schedules a function to be called when an animation frame is triggered.
- * Mock implementation for requestAnimationFrame.
- * @param {Function} funcToCall The function to call.
- * @return {number} The number of timeouts created.
- * @private
- */
-goog.testing.MockClock.prototype.requestAnimationFrame_ = function(funcToCall) {
-  return this.setTimeout_(goog.bind(function() {
-    if (funcToCall) {
-      funcToCall(this.getCurrentTime());
-    } else if (goog.global.mozRequestAnimationFrame) {
-      var event = new goog.testing.events.Event('MozBeforePaint', goog.global);
-      event['timeStamp'] = this.getCurrentTime();
-      goog.testing.events.fireBrowserEvent(event);
-    }
-  }, this), goog.testing.MockClock.REQUEST_ANIMATION_FRAME_TIMEOUT);
-};
-
-
-/**
- * Clears a timeout.
- * Mock implementation for clearTimeout.
- * @param {number} timeoutKey The timeout key to clear.
- * @private
- */
-goog.testing.MockClock.prototype.clearTimeout_ = function(timeoutKey) {
-  // Some common libraries register static state with timers.
-  // This is bad. It leads to all sorts of crazy test problems where
-  // 1) Test A sets up a new mock clock and a static timer.
-  // 2) Test B sets up a new mock clock, but re-uses the static timer
-  //    from Test A.
-  // 3) A timeout key from test A gets cleared, breaking a timeout in
-  //    Test B.
-  //
-  // For now, we just hackily fail silently if someone tries to clear a timeout
-  // key before we've allocated it.
-  // Ideally, we should throw an exception if we see this happening.
-  //
-  // TODO(user): We might also try allocating timeout ids from a global
-  // pool rather than a local pool.
-  if (this.isTimeoutSet(timeoutKey)) {
-    this.deletedKeys_[timeoutKey] = true;
-  }
-};
-
-
-/**
- * Clears an interval.
- * Mock implementation for clearInterval.
- * @param {number} timeoutKey The interval key to clear.
- * @private
- */
-goog.testing.MockClock.prototype.clearInterval_ = function(timeoutKey) {
-  this.clearTimeout_(timeoutKey);
-};
-
-
-/**
- * Clears a requestAnimationFrame.
- * Mock implementation for cancelRequestAnimationFrame.
- * @param {number} timeoutKey The requestAnimationFrame key to clear.
- * @private
- */
-goog.testing.MockClock.prototype.cancelRequestAnimationFrame_ =
-    function(timeoutKey) {
-  this.clearTimeout_(timeoutKey);
-};