Cast audio only policy enforcement support.

extensions/browser/api/cast_channel/cast_channel_api.cc

Index: extensions/browser/api/cast_channel/cast_channel_api.cc
diff --git a/extensions/browser/api/cast_channel/cast_channel_api.cc b/extensions/browser/api/cast_channel/cast_channel_api.cc
index 08e05d42746ccba4fd355d754855ad717e5c3471..5c351b7fe31eefdc29ba83834358f3fb25e9faa9 100644
--- a/extensions/browser/api/cast_channel/cast_channel_api.cc
+++ b/extensions/browser/api/cast_channel/cast_channel_api.cc
@@ -347,7 +347,8 @@ void CastChannelOpenFunction::AsyncWorkStart() {
         base::TimeDelta::FromMilliseconds(connect_info_->timeout.get()
                                               ? *connect_info_->timeout
                                               : kDefaultConnectTimeoutMillis),
-        api_->GetLogger());
+        api_->GetLogger(),
+        connect_info_->capabilities.get() ? *connect_info_->capabilities : 0);

[mark a. foltz, 2015/01/13 01:42:19]

Consider declaring a constant value to provide the default.  It's not clear from
reading this that the default is "no capabilities".

[vadimgo, 2015/01/13 02:21:44]

Done.

   }
   new_channel_id_ = AddSocket(socket);
   scoped_ptr<CastMessageHandler> delegate(new CastMessageHandler(api_, socket));