Check if there is a SW controlling the start page for app banner.

content/browser/service_worker/service_worker_context_wrapper.h

Index: content/browser/service_worker/service_worker_context_wrapper.h
diff --git a/content/browser/service_worker/service_worker_context_wrapper.h b/content/browser/service_worker/service_worker_context_wrapper.h
index 8494035e9fa9a47bc642b7f882fe26e3f48cc1a5..4eb6771dd3ef33da99b24890611f2981b82fc05e 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -85,6 +85,10 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
       const net::CompletionCallback& callback) override;
   void GetAllOriginsInfo(const GetUsageInfoCallback& callback) override;
   void DeleteForOrigin(const GURL& origin_url) override;
+  void CheckHasServiceWorker(
+      const GURL& url,
+      const GURL& other_url,
+      const CheckHasServiceWorkerCallback& callback) override;
 
   // DeleteForOrigin with completion callback.  Does not exit early, and returns
   // false if one or more of the deletions fail.
@@ -129,6 +133,12 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
       const GetUsageInfoCallback& callback,
       const std::vector<ServiceWorkerRegistrationInfo>& registrations);
 
+  void DidFindRegistrationForCheckHasServiceWorker(
+      const GURL& other_url,
+      const CheckHasServiceWorkerCallback& callback,
+      ServiceWorkerStatusCode status,
+      const scoped_refptr<ServiceWorkerRegistration>& registration);
+
   const scoped_refptr<ObserverListThreadSafe<ServiceWorkerContextObserver> >
       observer_list_;
   const scoped_ptr<ServiceWorkerProcessManager> process_manager_;