Implement native bindings for cast extensions API

chrome/common/extensions/api/webrtc_cast_udp_transport.idl

 // Copyright 2013 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 <code>chrome.webrtc.castUdpTransport</code> API creates a UDP
 // transport for outer transport to send and receive data. This API is not
 // useful when standalone since it does not have send and receive methods.
 // It should be used as an inner transport for other transports such as
 // castSendTransport.
 namespace webrtc.castUdpTransport {
   // The UDP socket address and port.
   dictionary UdpParams {
     DOMString address;
     long port;
   };
 
   // Result of <code>create</code> call.
   dictionary CreateInfo {
     // The ID of the newly created UDP transport.
-    long tranportId;
+    long transportId;
 
     // The transport params.
     UdpParams params;
   };
 
   // Callback from the <code>create</code> method.
   // |createInfo| : The transport info.
   // A null value indicates an error.
   callback CreateCallback = void (CreateInfo createInfo);
 
   interface Functions {
     // Creates a UDP transport.
     // |callback| : Called when the transport has been created.
     [nocompile] static void create(CreateCallback callback);
 
     // Destroys a UDP transport.
     // |transportId| : The transport ID.
     [nocompile] static void destroy(long transportId);
 
     // Starts to use the transport by providing remote UDP info.
     // |transportId| : The transport ID.
     // |remoteParams| : The address and port to send packets to.
     [nocompile] static void start(long transportId, UdpParams remoteParams);
 
     // Stops using the transport.
     // |transportId| : The transport ID.
     [nocompile] static void stop(long transportId);
   };
 };