Adding CastRemotingSender for media remoting.

chrome/test/data/extensions/api_test/cast_streaming/null_stream.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.
 
 var rtpStream = chrome.cast.streaming.rtpStream;
 var tabCapture = chrome.tabCapture;
 var udpTransport = chrome.cast.streaming.udpTransport;
 var createSession = chrome.cast.streaming.session.create;
 var pass = chrome.test.callbackPass;
 
@@ skipping 27 matching lines @@
                       pass(function(stream, audioId, videoId, udpId) {
           chrome.test.assertTrue(audioId == null);
           chrome.test.assertTrue(videoId > 0);
           chrome.test.assertTrue(udpId > 0);
           rtpStream.destroy(videoId);
           udpTransport.destroy(udpId);
         }.bind(null, stream)));
       }));
     }));
   },
   function noStream() {

[miu, 2016/09/02 21:32:40]

Let's rename this to something like "remotingSession".

[xjz, 2016/09/02 22:00:10]

Done.

     console.log("[TEST] noAudio");

[miu, 2016/09/02 21:32:40]

...and update the logging string here.

[xjz, 2016/09/02 22:00:10]

Done.

     chrome.tabs.create({"url": "about:blank"}, pass(function(tab) {
-      try {
-        createSession(null, null, function(a, b, c) {});
-        chrome.test.fail();
-      } catch (e) {
-        // Success.
-      }
+      createSession(null, null, function(a, b, c) {});
     }));
   },
 ]);