fix(cmcd): Fix Symbol usage in CMCD on Xbox One (shaka-project#4073)

Close shaka-project#4072

Co-authored-by: Joey Parrish <[email protected]>

build/types/polyfill

@@ -15,6 +15,7 @@
 +../../lib/polyfill/pip_webkit.js
 +../../lib/polyfill/random_uuid.js
 +../../lib/polyfill/storage_estimate.js
++../../lib/polyfill/symbol.js
 +../../lib/polyfill/video_play_promise.js
 +../../lib/polyfill/videoplaybackquality.js
 +../../lib/polyfill/vttcue.js

lib/polyfill/symbol.js

@@ -0,0 +1,46 @@
+/*! @license
+ * Shaka Player
+ * Copyright 2016 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+goog.provide('shaka.polyfill.Symbol');
+
+goog.require('shaka.log');
+goog.require('shaka.polyfill');
+
+/**
+ * @summary A polyfill to provide Symbol.prototype.description in all browsers.
+ * See: https://caniuse.com/mdn-javascript_builtins_symbol_description
+ * @export
+ */
+shaka.polyfill.Symbol = class {
+  /**
+   * Install the polyfill if needed.
+   * @export
+   */
+  static install() {
+    shaka.log.debug('Symbol.install');
+
+    // eslint-disable-next-line no-restricted-syntax
+    const proto = Symbol.prototype;
+
+    if (!('description' in proto)) {
+      Object.defineProperty(proto, 'description', {
+        get: shaka.polyfill.Symbol.getSymbolDescription_,
+      });
+    }
+  }
+
+  /**
+   * @this {Symbol}
+   * @return {(string|undefined)}
+   * @private
+   */
+  static getSymbolDescription_() {
+    const m = /\((.*)\)/.exec(this.toString());
+    return m ? m[1] : undefined;
+  }
+};
+
+
+shaka.polyfill.register(shaka.polyfill.Symbol.install);

shaka-player.uncompiled.js

@@ -45,6 +45,7 @@ goog.require('shaka.polyfill.PatchedMediaKeysNop');
 goog.require('shaka.polyfill.PatchedMediaKeysWebkit');
 goog.require('shaka.polyfill.PiPWebkit');
 goog.require('shaka.polyfill.RandomUUID');
+goog.require('shaka.polyfill.Symbol');
 goog.require('shaka.polyfill.VTTCue');
 goog.require('shaka.polyfill.VideoPlayPromise');
 goog.require('shaka.polyfill.VideoPlaybackQuality');