Store the service worker script and its imports on first load... kinda

content/browser/service_worker/service_worker_version.h

Index: content/browser/service_worker/service_worker_version.h
diff --git a/content/browser/service_worker/service_worker_version.h b/content/browser/service_worker/service_worker_version.h
index 3329844883814932bc12ecb0914fc3e66ae7f930..f7381dadfcbcad4019a3031afa7f6ad628d0f3f2 100644
--- a/content/browser/service_worker/service_worker_version.h
+++ b/content/browser/service_worker/service_worker_version.h
@@ -70,7 +70,7 @@ class CONTENT_EXPORT ServiceWorkerVersion
                  // different states for different termination sequences)
   };
 
-  class Listener {
+  class CONTENT_EXPORT Listener {
    public:
     virtual void OnWorkerStarted(ServiceWorkerVersion* version) = 0;
     virtual void OnWorkerStopped(ServiceWorkerVersion* version) = 0;