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..5ea8c612116f4d9c2690e8369e5938026d79881f 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;
@@ -86,6 +86,8 @@ class CONTENT_EXPORT ServiceWorkerVersion
                                         const base::string16& message,
                                         int line_number,
                                         const GURL& source_url) = 0;
+    virtual void OnMainScriptCacheResult(ServiceWorkerVersion* version,
+                                         bool success) {}
   };
 
   ServiceWorkerVersion(
@@ -215,6 +217,9 @@ class CONTENT_EXPORT ServiceWorkerVersion
   void AddToScriptCache(const GURL& url, int64 resource_id);
   int64 LookupInScriptCache(const GURL& url);
 
+  // Propagates to to Listeners.
+  void NotifyMainScriptCacheResult(bool success);
+
  private:
   typedef ServiceWorkerVersion self;
   typedef std::map<ServiceWorkerProviderHost*, int> ControlleeMap;