Bug 1784482 - Implement method for single script loading; r=asuth

This will be used by child modules. This is currently not used, but it will be in modules. I can
move this over to the other bug, if necessary.

Depends on D147325

Differential Revision: https://phabricator.services.mozilla.com/D147321

dom/workers/ScriptLoader.cpp

@@ -481,6 +481,25 @@ already_AddRefed<ScriptLoadRequest> WorkerScriptLoader::CreateScriptLoadRequest(
   return request.forget();
 }
 
+bool WorkerScriptLoader::DispatchLoadScript(ScriptLoadRequest* aRequest) {
+  mWorkerRef->Private()->AssertIsOnWorkerThread();
+
+  nsTArray<WorkerLoadContext*> scriptLoadList;
+  scriptLoadList.AppendElement(aRequest->GetWorkerLoadContext());
+
+  nsresult rv =
+      NS_DispatchToMainThread(NewRunnableMethod<nsTArray<WorkerLoadContext*>&&>(
+          "WorkerScriptLoader::LoadScripts", this,
+          &WorkerScriptLoader::LoadScripts, std::move(scriptLoadList)));
+
+  if (NS_FAILED(rv)) {
+    NS_ERROR("Failed to dispatch!");
+    mRv.Throw(NS_ERROR_FAILURE);
+    return false;
+  }
+  return true;
+}
+
 bool WorkerScriptLoader::DispatchLoadScripts() {
   mWorkerRef->Private()->AssertIsOnWorkerThread();
 

dom/workers/ScriptLoader.h

@@ -160,6 +160,8 @@ class WorkerScriptLoader final : public nsINamed {
       const nsString& aScriptURL, const mozilla::Encoding* aDocumentEncoding,
       bool aIsMainScript);
 
+  bool DispatchLoadScript(ScriptLoadRequest* aRequest);
+
   bool DispatchLoadScripts();
 
  protected: