Implement a stub Worker interface.

Part of #2811.

src/components/script/dom/webidls/Worker.webidl

@@ -0,0 +1,20 @@
+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+// http://www.whatwg.org/html/#abstractworker
+[NoInterfaceObject/*, Exposed=Window,Worker*/]
+interface AbstractWorker {
+  //         attribute EventHandler onerror;
+};
+
+// http://www.whatwg.org/html/#worker
+[Constructor(DOMString scriptURL)/*, Exposed=Window,Worker*/]
+interface Worker : EventTarget {
+  //void terminate();
+
+  //void postMessage(any message/*, optional sequence<Transferable> transfer*/);
+  //         attribute EventHandler onmessage;
+};
+Worker implements AbstractWorker;

src/components/script/dom/worker.rs

@@ -0,0 +1,31 @@
+/* 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/. */
+
+use dom::bindings::error::{Fallible, Security};
+use dom::bindings::global::GlobalRef;
+use dom::bindings::js::Temporary;
+use dom::bindings::utils::{Reflectable, Reflector};
+use dom::eventtarget::EventTarget;
+
+use servo_util::str::DOMString;
+
+#[deriving(Encodable)]
+pub struct Worker {
+    eventtarget: EventTarget,
+}
+
+impl Worker {
+    pub fn Constructor(_global: &GlobalRef, _scriptURL: DOMString) -> Fallible<Temporary<Worker>> {
+        Err(Security)
+    }
+}
+
+pub trait WorkerMethods {
+}
+
+impl Reflectable for Worker {
+    fn reflector<'a>(&'a self) -> &'a Reflector {
+        self.eventtarget.reflector()
+    }
+}

src/components/script/script.rs

@@ -173,6 +173,7 @@ pub mod dom {
     pub mod validitystate;
     pub mod virtualmethods;
     pub mod window;
+    pub mod worker;
     pub mod xmlhttprequest;
     pub mod xmlhttprequesteventtarget;
     pub mod xmlhttprequestupload;

src/test/content/test_interfaces.html

@@ -155,6 +155,7 @@ var interfaceNamesInGlobalScope = [
   "URLSearchParams",
   "ValidityState",
   "Window",
+  "Worker",
   "XMLHttpRequest",
   "XMLHttpRequestUpload",
 ];