Implement sync XHR by creating and spinning on-demand event loops.

components/script/dom/bindings/global.rs

@@ -12,8 +12,8 @@ use dom::bindings::js::{JS, JSRef, Root, Unrooted};
 use dom::bindings::utils::{Reflectable, Reflector};
 use dom::workerglobalscope::{WorkerGlobalScope, WorkerGlobalScopeHelpers};
 use dom::window::{self, WindowHelpers};
-use script_task::ScriptChan;
 use devtools_traits::DevtoolsControlChan;
+use script_task::{ScriptChan, ScriptPort, ScriptMsg, ScriptTask};
 
 use msg::constellation_msg::{PipelineId, WorkerId};
 use net_traits::ResourceTask;
@@ -129,6 +129,24 @@ impl<'a> GlobalRef<'a> {
             GlobalRef::Worker(ref worker) => worker.script_chan(),
         }
     }
+
+    /// `ScriptChan` used to send messages to the event loop of this global's
+    /// thread.
+    pub fn new_script_pair(&self) -> (Box<ScriptChan+Send>, Box<ScriptPort+Send>) {
+        match *self {
+            GlobalRef::Window(ref window) => window.new_script_pair(),
+            GlobalRef::Worker(ref worker) => worker.new_script_pair(),
+        }
+    }
+
+    /// Process a single event as if it were the next event in the task queue for
+    /// this global.
+    pub fn process_event(&self, msg: ScriptMsg) {
+        match *self {
+            GlobalRef::Window(_) => ScriptTask::process_event(msg),
+            GlobalRef::Worker(ref worker) => worker.process_event(msg),
+        }
+    }
 }
 
 impl<'a> Reflectable for GlobalRef<'a> {