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/webidls/MessageChannel.webidl

@@ -0,0 +1,14 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/#messagechannel
+ */
+
+[Exposed=(Window,Worker)]
+interface MessageChannel {
+  [Throws] constructor();
+  readonly attribute MessagePort port1;
+  readonly attribute MessagePort port2;
+};

components/script/dom/webidls/MessageEvent.webidl

@@ -12,7 +12,7 @@ interface MessageEvent : Event {
   // FIXME(#22617): WindowProxy is not exposed in Worker globals
   readonly attribute object? source;
   //readonly attribute (WindowProxy or MessagePort)? source;
-  //readonly attribute MessagePort[]? ports;
+  readonly attribute /*FrozenArray<MessagePort>*/any ports;
 };
 
 dictionary MessageEventInit : EventInit {
@@ -22,5 +22,7 @@ dictionary MessageEventInit : EventInit {
   //DOMString channel;
   Window? source;
   //(WindowProxy or MessagePort)? source;
-  //sequence<MessagePort> ports;
+  sequence<MessagePort> ports;
 };
+
+typedef (/*WindowProxy or */MessagePort or ServiceWorker) MessageEventSource;

components/script/dom/webidls/MessagePort.webidl

@@ -0,0 +1,17 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+/*
+ * The origin of this IDL file is:
+ * https://html.spec.whatwg.org/multipage/#messageport
+ */
+
+[Exposed=(Window,Worker)]
+interface MessagePort : EventTarget {
+  [Throws] void postMessage(any message, optional sequence<object> transfer /*= []*/);
+  void start();
+  void close();
+
+  // event handlers
+  attribute EventHandler onmessage;
+};

components/script/dom/webidls/Window.webidl

@@ -63,9 +63,8 @@
   unsigned long requestAnimationFrame(FrameRequestCallback callback);
   void cancelAnimationFrame(unsigned long handle);
 
-  //void postMessage(any message, DOMString targetOrigin, optional sequence<Transferable> transfer);
   [Throws]
-  void postMessage(any message, DOMString targetOrigin);
+  void postMessage(any message, USVString targetOrigin, optional sequence<object> transfer /*= []*/);
 
   // also has obsolete members
 };