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

content/browser/service_worker/service_worker_version.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/service_worker/service_worker_version.h"
 
 #include "base/command_line.h"
 #include "base/stl_util.h"
 #include "content/browser/service_worker/embedded_worker_instance.h"
 #include "content/browser/service_worker/embedded_worker_registry.h"
@@ skipping 543 matching lines @@
   script_cache_map_[url] = resource_id;
 }
 
 int64 ServiceWorkerVersion::LookupInScriptCache(const GURL& url) {
   ResourceIDMap::const_iterator found = script_cache_map_.find(url);
   if (found == script_cache_map_.end())
     return kInvalidServiceWorkerResponseId;
   return found->second;
 }
 
+void ServiceWorkerVersion::NotifyMainScriptCacheResult(bool success) {
+  FOR_EACH_OBSERVER(Listener, listeners_,
+                    OnMainScriptCacheResult(this, success));
+}
+
 }  // namespace content