Cast Extensions API: Factory method for creating a cast session

chrome/common/extensions/api/cast_streaming.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.cast.streaming</code> API creates a Cast
+// session using WebMediaStreamTrack as sources. The session is composed
+// by RTP streams and a network transport.
+namespace cast.streaming {
+  // Callback from the <code>castCreateSession</code> method.
+  // |id| : The transport id.

[haibinlu, 2013/11/23 02:10:00]

document parameters.

+  callback CreateCallback = void (long audioId,

[haibinlu, 2013/11/23 02:10:00]

audioId and vidoeId are unclear. 

+                                  long videoId,
+                                  long transportId);

[haibinlu, 2013/11/23 02:10:00]

udpTransportId?

+
+  interface Functions {
+    // Creates a Cast session using the provided audio and video track as
+    // source. This will create two RTP streams and a UDP transport that
+    // builds the session.
+    //
+    // |audioTrack| : the source audio track.
+    // |videoTrack| : the source video track.
+    // |callback| : Called when the sesion has been created.
+    [nocompile] static void createSession(
+        [instanceOf=MediaStreamTrack] object audioTrack,
+        [instanceOf=MediaStreamTrack] object videoTrack,
+        CreateCallback callback);
+  };
+};