Reland of Check that all shared workers are terminated.

content/browser/shared_worker/shared_worker_service_impl.cc

 // 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.
 
 #include "content/browser/shared_worker/shared_worker_service_impl.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 #include <iterator>
@@ skipping 428 matching lines @@
     pending_instances_.erase(to_remove);
 }
 
 void SharedWorkerServiceImpl::NotifyWorkerDestroyed(int worker_process_id,
                                                     int worker_route_id) {
   FOR_EACH_OBSERVER(WorkerServiceObserver,
                     observers_,
                     WorkerDestroyed(worker_process_id, worker_route_id));
 }
 
+// TODO(alokp): Remove after collecting crash data.
+// Temporary checks to verify that all shared workers are terminated.
+// It is suspected that shared workers prevent render process hosts
+// from shutting down: crbug.com/608049
+void SharedWorkerServiceImpl::CheckAllWorkersTerminated() {
+  std::set<int> dependent_renderers = GetRenderersWithWorkerDependency();
+  CHECK_EQ(0u, dependent_renderers.size());
+}
+
 blink::WebWorkerCreationError
 SharedWorkerServiceImpl::ReserveRenderProcessToCreateWorker(
     std::unique_ptr<SharedWorkerPendingInstance> pending_instance) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(!FindPendingInstance(*pending_instance->instance()));
   if (!pending_instance->requests()->size())
     return blink::WebWorkerCreationErrorNone;
 
   int worker_process_id = -1;
   int worker_route_id = MSG_ROUTING_NONE;
@@ skipping 187 matching lines @@
     UpdateWorkerDependencyFunc new_func) {
   update_worker_dependency_ = new_func;
 }
 
 void SharedWorkerServiceImpl::ChangeTryIncrementWorkerRefCountFuncForTesting(
     bool (*new_func)(int)) {
   s_try_increment_worker_ref_count_ = new_func;
 }
 
 }  // namespace content