begin messageport, transferable objects, impl

Accept transfer argument for StructuredCloneData::write

Allow structured clone reads to return a boolean

Add Transferable trait

Add basic skeletons to MessagePort

Implement transfer and transfer-receiving steps on MessagePort

Use transfer and transfer_receive in StructuredClone callbacks

Implement MessageChannel

Freeze the array object for the MessageEvent ports attribute

Implement transfer argument on window.postMessage

Use ReentrantMutex instead for MessagePortInternal

Accept origin as a parameter in dispatch_jsval

Fix BorrowMut crash with pending_port_message

Detach port on closure and check for detached during transfer

Enable webmessaging tests

fix webidl

fix

components/script/dom/abstractworker.rs

@@ -12,7 +12,10 @@ pub enum WorkerScriptMsg {
     /// Common variants associated with the script messages
     Common(CommonScriptMsg),
     /// Message sent through Worker.postMessage
-    DOMMessage(StructuredCloneData),
+    DOMMessage {
+        origin: String,
+        data: StructuredCloneData,
+    }
 }
 
 pub struct SimpleWorkerErrorHandler<T: DomObject> {