Cast: Let the extension control if DSCP is on or off.

chrome/common/extensions/api/cast_streaming_udp_transport.idl

Index: chrome/common/extensions/api/cast_streaming_udp_transport.idl
diff --git a/chrome/common/extensions/api/cast_streaming_udp_transport.idl b/chrome/common/extensions/api/cast_streaming_udp_transport.idl
index 11ca003db1c70876a39aed788344be49b804a55b..448d2d02db64504bea541870a87191b16f1f7bfe 100644
--- a/chrome/common/extensions/api/cast_streaming_udp_transport.idl
+++ b/chrome/common/extensions/api/cast_streaming_udp_transport.idl
@@ -26,5 +26,11 @@ namespace cast.streaming.udpTransport {
     // |destination| : The address and port to send packets to.
     [nocompile] static void setDestination(long transportId,
                                            IPEndPoint destination);
+
+    // Sets the option string.
+    // Options are colon-separated strings which specify how the
+    // transport behaves. Normally this is only used for experimentation.
+    // Must be called before setDestination.
+    [nocompile] static void setOptions(DOMString options);

[Alpha Left Google, 2014/09/09 00:30:45]

I think this should be an object instead of a string. Being an object javascript
code can easily add / remove entries and don't have to join when calling this
method. It's also a proper key value data structure.

e.g.
[nocompile] static void setOptions(object options);

v8 object can easily be converted to a base::DictionaryValue.

[hubbe, 2014/09/09 20:10:01]

Done.

   };
 };