Bug 1847548 - Part 1: Use nsIContentPolicy::TYPE_INTERNAL_MODULE for worker's dynamic import scripts. r=dom-worker-reviewers,smaug,evilpie

Differential Revision: https://phabricator.services.mozilla.com/D185563

dom/base/nsIContentPolicy.idl

@@ -336,7 +336,11 @@ interface nsIContentPolicy : nsISupports
 
     /**
      * Indicates an internal constant for ES6 module scripts
-     * loaded through script elements or an import statement.
+     * loaded through script elements or an import statement (static import) or
+     * an import expression (dynamic import).
+     * It also indicates the load for dynamic import in workers.
+     * For static import in module workers,
+     * please check TYPE_INTERNAL_WORKER_STATIC_MODULE.
      *
      * This will be mapped to TYPE_SCRIPT before being passed
      * to content policy implementations.

dom/workers/ScriptLoader.cpp

@@ -602,6 +602,10 @@ nsContentPolicyType WorkerScriptLoader::GetContentPolicyType(
     return mWorkerRef->Private()->ContentPolicyType();
   }
   if (aRequest->IsModuleRequest()) {
+    if (aRequest->AsModuleRequest()->IsDynamicImport()) {
+      return nsIContentPolicy::TYPE_INTERNAL_MODULE;
+    }
+
     // Implements the destination for Step 14 in
     // https://html.spec.whatwg.org/#worker-processing-model
     //
@@ -610,6 +614,7 @@ nsContentPolicyType WorkerScriptLoader::GetContentPolicyType(
     // "sharedworker".
     return nsIContentPolicy::TYPE_INTERNAL_WORKER_STATIC_MODULE;
   }
+  // For script imported in worker's importScripts().
   return nsIContentPolicy::TYPE_INTERNAL_WORKER_IMPORT_SCRIPTS;
 }