TabManager checks if ServiceWorker exists on the suspending process

content/public/browser/service_worker_context.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_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_
 
 #include <set>
 #include <string>
 
@@ skipping 127 matching lines @@
   // thread. The |callback| will always be called on the UI thread.
   // This method can fail if:
   //  * No Service Worker was registered for |document_url|.
   //  * The specified render process is not suitable for loading |document_url|.
   virtual void StartServiceWorkerForNavigationHint(
       const GURL& document_url,
       blink::WebNavigationHintType type,
       int render_process_id,
       const ResultCallback& callback) = 0;
 
+  // Check if any service worker exists on the process specified by
+  // |render_process_id|. Must be called from the IO thread. Returns true if
+  // one or more service workers exist on the process and false if no worker
+  // resides.
+  virtual bool IsServiceWorkerExistsOnProcess(int render_process_id) = 0;
+
  protected:
   ServiceWorkerContext() {}
   virtual ~ServiceWorkerContext() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SERVICE_WORKER_CONTEXT_H_