TabManager checks if ServiceWorker exists on the suspending process

content/browser/service_worker/embedded_worker_registry.cc

 // Copyright 2013 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.
 
 #include "content/browser/service_worker/embedded_worker_registry.h"
 
 #include "base/bind_helpers.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "content/browser/renderer_host/render_widget_helper.h"
@@ skipping 161 matching lines @@
     const base::string16& message,
     int line_number,
     const GURL& source_url) {
   EmbeddedWorkerInstance* worker = GetWorker(embedded_worker_id);
   if (!worker)
     return;
   worker->OnReportConsoleMessage(source_identifier, message_level, message,
                                  line_number, source_url);
 }
 
+bool EmbeddedWorkerRegistry::IsWorkerExists(int process_id) {
+  return base::ContainsKey(worker_process_map_, process_id);
+}
+
 void EmbeddedWorkerRegistry::AddChildProcessSender(
     int process_id,
     IPC::Sender* sender,
     MessagePortMessageFilter* message_port_message_filter) {
   process_sender_map_[process_id] = sender;
   process_message_port_message_filter_map_[process_id] =
       message_port_message_filter;
   DCHECK(!base::ContainsKey(worker_process_map_, process_id));
 }
 
@@ skipping 128 matching lines @@
   EmbeddedWorkerInstance* worker = GetWorker(embedded_worker_id);
   if (!worker || worker->process_id() != process_id) {
     UMA_HISTOGRAM_BOOLEAN("ServiceWorker.WorkerForMessageFound", false);
     return nullptr;
   }
   UMA_HISTOGRAM_BOOLEAN("ServiceWorker.WorkerForMessageFound", true);
   return worker;
 }
 
 }  // namespace content