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

content/browser/service_worker/service_worker_version.cc

Index: content/browser/service_worker/service_worker_version.cc
diff --git a/content/browser/service_worker/service_worker_version.cc b/content/browser/service_worker/service_worker_version.cc
index 77e01c1a470d7b9719000a9c2f73284d7ec5a4e6..027504c955e1bddb20385709b55bb0177f1b376e 100644
--- a/content/browser/service_worker/service_worker_version.cc
+++ b/content/browser/service_worker/service_worker_version.cc
@@ -550,7 +550,7 @@ void ServiceWorkerVersion::OnSyncEventFinished(
 void ServiceWorkerVersion::AddToScriptCache(
     const GURL& url, int64 resource_id) {
   DCHECK_EQ(kInvalidServiceWorkerResponseId, LookupInScriptCache(url));
-  DCHECK_EQ(NEW, status_);
+  DCHECK(status_ == NEW || status_ == INSTALLING);
   script_cache_map_[url] = resource_id;
 }