diff --git a/components/script/dom/dedicatedworkerglobalscope.rs b/components/script/dom/dedicatedworkerglobalscope.rs
index 2d1fba86cf8..fc1b2301559 100644
--- a/components/script/dom/dedicatedworkerglobalscope.rs
+++ b/components/script/dom/dedicatedworkerglobalscope.rs
@@ -21,7 +21,7 @@ use dom::eventtarget::{EventTarget, EventTargetHelpers, EventTargetTypeId};
 use dom::messageevent::MessageEvent;
 use dom::worker::{TrustedWorkerAddress, WorkerMessageHandler, WorkerEventHandler, WorkerErrorHandler};
 use dom::workerglobalscope::{WorkerGlobalScope, WorkerGlobalScopeHelpers};
-use dom::workerglobalscope::WorkerGlobalScopeTypeId;
+use dom::workerglobalscope::{WorkerGlobalScopeTypeId, WorkerGlobalScopeInit};
 use script_task::{ScriptTask, ScriptChan, ScriptMsg, TimerSource, ScriptPort};
 use script_task::StackRootTLS;
 
@@ -107,25 +107,19 @@ pub struct DedicatedWorkerGlobalScope {
 }
 
 impl DedicatedWorkerGlobalScope {
-    fn new_inherited(worker_url: Url,
+    fn new_inherited(init: WorkerGlobalScopeInit,
+                     worker_url: Url,
                      id: PipelineId,
-                     mem_profiler_chan: mem::ProfilerChan,
-                     devtools_chan: Option<IpcSender<ScriptToDevtoolsControlMsg>>,
-                     devtools_sender: Option<IpcSender<DevtoolScriptControlMsg>>,
                      devtools_port: Receiver<DevtoolScriptControlMsg>,
                      runtime: Rc<Runtime>,
-                     resource_task: ResourceTask,
-                     constellation_chan: ConstellationChan,
                      parent_sender: Box<ScriptChan+Send>,
                      own_sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
-                     receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>,
-                     worker_id: WorkerId)
+                     receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>)
                      -> DedicatedWorkerGlobalScope {
         DedicatedWorkerGlobalScope {
             workerglobalscope: WorkerGlobalScope::new_inherited(
-                WorkerGlobalScopeTypeId::DedicatedGlobalScope, worker_url, runtime, resource_task,
-                mem_profiler_chan, devtools_chan, devtools_sender, devtools_port, constellation_chan,
-                worker_id),
+                WorkerGlobalScopeTypeId::DedicatedGlobalScope, init, worker_url,
+                runtime, devtools_port),
             id: id,
             receiver: receiver,
             own_sender: own_sender,
@@ -134,24 +128,18 @@ impl DedicatedWorkerGlobalScope {
         }
     }
 
-    pub fn new(worker_url: Url,
+    pub fn new(init: WorkerGlobalScopeInit,
+               worker_url: Url,
                id: PipelineId,
-               mem_profiler_chan: mem::ProfilerChan,
-               devtools_chan: Option<IpcSender<ScriptToDevtoolsControlMsg>>,
-               devtools_sender: Option<IpcSender<DevtoolScriptControlMsg>>,
                devtools_port: Receiver<DevtoolScriptControlMsg>,
                runtime: Rc<Runtime>,
-               resource_task: ResourceTask,
-               constellation_chan: ConstellationChan,
                parent_sender: Box<ScriptChan+Send>,
                own_sender: Sender<(TrustedWorkerAddress, ScriptMsg)>,
-               receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>,
-               worker_id: WorkerId)
+               receiver: Receiver<(TrustedWorkerAddress, ScriptMsg)>)
                -> Root<DedicatedWorkerGlobalScope> {
         let scope = box DedicatedWorkerGlobalScope::new_inherited(
-            worker_url, id, mem_profiler_chan, devtools_chan, devtools_sender, devtools_port,
-            runtime.clone(), resource_task, constellation_chan, parent_sender, own_sender, receiver,
-            worker_id);
+            init, worker_url, id, devtools_port, runtime.clone(), parent_sender,
+            own_sender, receiver);
         DedicatedWorkerGlobalScopeBinding::Wrap(runtime.cx(), scope)
     }
 }
@@ -197,10 +185,17 @@ impl DedicatedWorkerGlobalScope {
             let (devtools_mpsc_chan, devtools_mpsc_port) = channel();
             ROUTER.route_ipc_receiver_to_mpsc_sender(devtools_ipc_port, devtools_mpsc_chan);
 
+            let init = WorkerGlobalScopeInit {
+                resource_task: resource_task,
+                mem_profiler_chan: mem_profiler_chan.clone(),
+                devtools_chan: devtools_chan,
+                devtools_sender: devtools_ipc_chan,
+                constellation_chan: constellation_chan,
+                worker_id: worker_id,
+            };
             let global = DedicatedWorkerGlobalScope::new(
-                url, id, mem_profiler_chan.clone(), devtools_chan, devtools_ipc_chan, devtools_mpsc_port,
-                runtime.clone(), resource_task, constellation_chan, parent_sender, own_sender, receiver,
-                worker_id);
+                init, url, id, devtools_mpsc_port, runtime.clone(),
+                parent_sender, own_sender, receiver);
             // FIXME(njn): workers currently don't have a unique ID suitable for using in reporter
             // registration (#6631), so we instead use a random number and cross our fingers.
             let scope = WorkerGlobalScopeCast::from_ref(global.r());
diff --git a/components/script/dom/workerglobalscope.rs b/components/script/dom/workerglobalscope.rs
index dd3b9d21c00..91d140dc823 100644
--- a/components/script/dom/workerglobalscope.rs
+++ b/components/script/dom/workerglobalscope.rs
@@ -42,6 +42,15 @@ pub enum WorkerGlobalScopeTypeId {
     DedicatedGlobalScope,
 }
 
+pub struct WorkerGlobalScopeInit {
+    pub resource_task: ResourceTask,
+    pub mem_profiler_chan: mem::ProfilerChan,
+    pub devtools_chan: Option<IpcSender<ScriptToDevtoolsControlMsg>>,
+    pub devtools_sender: Option<IpcSender<DevtoolScriptControlMsg>>,
+    pub constellation_chan: ConstellationChan,
+    pub worker_id: WorkerId,
+}
+
 // https://html.spec.whatwg.org/multipage/#the-workerglobalscope-common-interface
 #[dom_struct]
 pub struct WorkerGlobalScope {
@@ -76,34 +85,29 @@ pub struct WorkerGlobalScope {
 
 impl WorkerGlobalScope {
     pub fn new_inherited(type_id: WorkerGlobalScopeTypeId,
+                         init: WorkerGlobalScopeInit,
                          worker_url: Url,
                          runtime: Rc<Runtime>,
-                         resource_task: ResourceTask,
-                         mem_profiler_chan: mem::ProfilerChan,
-                         devtools_chan: Option<IpcSender<ScriptToDevtoolsControlMsg>>,
-                         devtools_sender: Option<IpcSender<DevtoolScriptControlMsg>>,
-                         devtools_receiver: Receiver<DevtoolScriptControlMsg>,
-                         constellation_chan: ConstellationChan,
-                         worker_id: WorkerId)
+                         devtools_receiver: Receiver<DevtoolScriptControlMsg>)
                          -> WorkerGlobalScope {
         WorkerGlobalScope {
             eventtarget: EventTarget::new_inherited(EventTargetTypeId::WorkerGlobalScope(type_id)),
             next_worker_id: Cell::new(WorkerId(0)),
-            worker_id: worker_id,
+            worker_id: init.worker_id,
             worker_url: worker_url,
             runtime: runtime,
-            resource_task: resource_task,
+            resource_task: init.resource_task,
             location: Default::default(),
             navigator: Default::default(),
             console: Default::default(),
             crypto: Default::default(),
             timers: TimerManager::new(),
-            mem_profiler_chan: mem_profiler_chan,
-            devtools_chan: devtools_chan,
-            devtools_sender: devtools_sender,
+            mem_profiler_chan: init.mem_profiler_chan,
+            devtools_chan: init.devtools_chan,
+            devtools_sender: init.devtools_sender,
             devtools_receiver: devtools_receiver,
             devtools_wants_updates: Cell::new(false),
-            constellation_chan: constellation_chan,
+            constellation_chan: init.constellation_chan,
         }
     }