Implement robustness strings in requestMediaKeySystemAccess().

media/test/data/eme_player_js/player_utils.js

 // 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.
 
 // The PlayerUtils provides utility functions to binding common media events
 // to specific player functions. It also provides functions to load media source
 // base on test configurations.
 var PlayerUtils = new function() {
 }
 
@@ skipping 67 matching lines @@
         session.generateRequest(message.initDataType, message.initData)
             .catch(function(error) { Utils.failTest(error, KEY_ERROR); });
       }
     } catch (e) {
       Utils.failTest(e);
     }
   });
 
   this.registerDefaultEventListeners(player);
   Utils.timeLog('Setting video media keys: ' + player.testConfig.keySystem);
+  var persistentState = player.testConfig.sessionToLoad ? "required"
+                                                        : "optional";
   return navigator.requestMediaKeySystemAccess(
-      player.testConfig.keySystem, [{}])
+      player.testConfig.keySystem, [{persistentState: persistentState}])
       .then(function(access) { return access.createMediaKeys(); })
       .then(function(mediaKeys) {
         return player.video.setMediaKeys(mediaKeys);
       })
       .then(function(result) { return player; })
       .catch(function(error) { Utils.failTest(error, NOTSUPPORTEDERROR); });
 };
 
 // Register the necessary event handlers needed when playing encrypted content
 // using the prefixed API. Even though the prefixed API is all synchronous,
@@ skipping 90 matching lines @@
       default:
         Utils.timeLog(keySystem + ' is not a known key system');
         if (usePrefixedEME)
           return PrefixedClearKeyPlayer;
         return ClearKeyPlayer;
     }
   }
   var Player = getPlayerType(testConfig.keySystem);
   return new Player(video, testConfig);
 };