Fix math round when number > 2^52 on IE11

build/types/polyfill

@@ -2,6 +2,7 @@
 
 +../../lib/polyfill/fullscreen.js
 +../../lib/polyfill/indexed_db.js
++../../lib/polyfill/mathround.js
 +../../lib/polyfill/mediakeys.js
 +../../lib/polyfill/mediasource.js
 +../../lib/polyfill/patchedmediakeys_ms.js

lib/polyfill/mathround.js

@@ -0,0 +1,51 @@
+/**
+ * @license
+ * Copyright 2016 Google Inc.
+ *
+ * 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.
+ */
+goog.provide('shaka.polyfill.MathRound');
+
+goog.require('shaka.log');
+goog.require('shaka.polyfill.register');
+
+/**
+ * @namespace shaka.polyfill.MathRound
+ *
+ * @summary A polyfill to patch math round bug on IE11.
+ */
+
+
+/**
+ * Install the polyfill if needed.
+ */
+shaka.polyfill.MathRound.install = function() {
+  shaka.log.debug('mathRound.install');
+
+  var agent = navigator.userAgent;
+  if (agent && agent.indexOf('rv:11.0') >= 0) {
+    shaka.log.debug('fix mathRound on IE11');
+    var original_mathRound = Math.round;
+    Math.round = function(number) {
+      var result = number;
+      // workaround for IE brain-dead Math.round() implementation
+      // https://stackoverflow.com/questions/12830742/javascript-math-round-bug-in-ie
+      if (number < 4503599627370496) {
+        result = original_mathRound(number);
+      }
+      return result;
+    };
+  }
+};
+
+shaka.polyfill.register(shaka.polyfill.MathRound.install);

shaka-player.uncompiled.js

@@ -49,5 +49,6 @@ goog.require('shaka.polyfill.MediaSource');
 goog.require('shaka.polyfill.Promise');
 goog.require('shaka.polyfill.VTTCue');
 goog.require('shaka.polyfill.VideoPlaybackQuality');
+goog.require('shaka.polyfill.MathRound');
 goog.require('shaka.polyfill.installAll');
 goog.require('shaka.util.Error');