Issue 4497: Converts WorkerPostMessage into a Runnable.

Implements WorkerMessage handler implementing Runnable trait.

components/script/dom/worker.rs

@@ -16,7 +16,7 @@ use dom::bindings::utils::{Reflectable, reflect_dom_object};
 use dom::dedicatedworkerglobalscope::DedicatedWorkerGlobalScope;
 use dom::eventtarget::{EventTarget, EventTargetHelpers, EventTargetTypeId};
 use dom::messageevent::MessageEvent;
-use script_task::{ScriptChan, ScriptMsg};
+use script_task::{ScriptChan, ScriptMsg, Runnable};
 
 use servo_util::str::DOMString;
 
@@ -120,3 +120,24 @@ impl<'a> WorkerMethods for JSRef<'a, Worker> {
     event_handler!(message, GetOnmessage, SetOnmessage)
 }
 
+pub struct WorkerMessageHandler {
+    addr: TrustedWorkerAddress,
+    data: *mut u64,
+    nbytes: size_t
+}
+
+impl WorkerMessageHandler {
+    pub fn new(addr: TrustedWorkerAddress, data: *mut u64, nbytes: size_t) -> WorkerMessageHandler {
+        WorkerMessageHandler {
+            addr: addr,
+            data: data,
+            nbytes: nbytes,
+        }
+    }
+}
+
+impl Runnable for WorkerMessageHandler {
+    fn handler(&self){
+        Worker::handle_message(self.addr.clone(), self.data, self.nbytes);
+    }
+}