PlzNavigate: detect when a ServiceWorker is present

content/browser/loader/navigation_url_loader_delegate.h

Index: content/browser/loader/navigation_url_loader_delegate.h
diff --git a/content/browser/loader/navigation_url_loader_delegate.h b/content/browser/loader/navigation_url_loader_delegate.h
index 6f6cf1db2fbb8c17657ead15f935b5400d15f324..abfe074f667a3da6b4f6fab72ad7051ce2c64b18 100644
--- a/content/browser/loader/navigation_url_loader_delegate.h
+++ b/content/browser/loader/navigation_url_loader_delegate.h
@@ -49,6 +49,9 @@ class CONTENT_EXPORT NavigationURLLoaderDelegate {
   // until after the renderer was initialized.
   virtual void OnRequestStarted(base::TimeTicks timestamp) = 0;
 
+  // Called when a ServiceWorker was found for the navigation.
+  virtual void OnServiceWorkerEncountered() = 0;
+
  protected:
   NavigationURLLoaderDelegate() {}
   virtual ~NavigationURLLoaderDelegate() {}