PlzNavigate: detect when a ServiceWorker is present

content/browser/loader/navigation_url_loader_delegate.h

 // Copyright 2014 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.
 
 #ifndef CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_DELEGATE_H_
 #define CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_DELEGATE_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 31 matching lines @@
   // network error code for the failure. |has_stale_copy_in_cache| is true if
   // there is a stale copy of the unreachable page in cache.
   virtual void OnRequestFailed(bool has_stale_copy_in_cache, int net_error) = 0;
 
   // Called after the network request has begun on the IO thread at time
   // |timestamp|. This is just a thread hop but is used to compare timing
   // against the pre-PlzNavigate codepath which didn't start the network request
   // 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() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NavigationURLLoaderDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_LOADER_NAVIGATION_URL_LOADER_DELEGATE_H_