Add LayoutTests for MediaSource codec config changes.

LayoutTests/http/tests/media/media-source/mediasource-util.js

 (function(window) {
     EventExpectationsManager = function(test) {
         this.test_ = test;
         this.eventTargetList_ = [];
         this.waitCallbacks_ = [];
     };
 
     EventExpectationsManager.prototype.expectEvent = function(object, eventName, description)
     {
         var eventInfo = { 'target': object, 'type': eventName, 'description': description};
@@ skipping 64 matching lines @@
         request.onload = test.step_func(function(event)
         {
             if (request.status != 200) {
                 assert_unreached("Unexpected status code : " + request.status);
                 return;
             }
             var response = request.response;
             if (isBinary) {
                 response = new Uint8Array(response);
             }
-            callback(new Uint8Array(response));
+            callback(response);
         });
         request.onerror = test.step_func(function(event)
         {
             assert_unreached("Unexpected error");
         });
         request.send();
     }
 
     function openMediaSource_(test, mediaTag, callback)
     {
@@ skipping 69 matching lines @@
         var oldTestDone = test.done.bind(test);
         test.done = function()
         {
             if (test.status == test.PASS)
                 assert_false(test.eventExpectations_.expectingEvents(), "No pending event expectations.");
             oldTestDone();
         };
     };
 
     window['MediaSourceUtil'] = MediaSourceUtil;
-    window['mediasource_test'] = function(testFunction, description)
+    window['mediasource_test'] = function(testFunction, description, options)
     {
+        options = options || {};
         return async_test(function(test) {
             var mediaTag = document.createElement("video");
             document.body.appendChild(mediaTag);
 
             addExtraTestMethods(test);
 
             // Overload done() so that element added to the document can be removed.
             test.removeMediaElement_ = true;
             var oldTestDone = test.done.bind(test);
             test.done = function()
             {
                 if (test.removeMediaElement_) {
                     document.body.removeChild(mediaTag);
                     test.removeMediaElement_ = false;
                 }
                 oldTestDone();
             };
 
             openMediaSource_(test, mediaTag, function(mediaSource)
             {
                 testFunction(test, mediaTag, mediaSource);
             });
-        }, description);
+        }, description, options);
 
     };
 })(window);