Add CHECKs to investigate ServiceWorkerControlleeRequestHandler crash.

content/browser/service_worker/service_worker_provider_host.h

 // 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.
 
 #ifndef CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 241 matching lines @@
   void AddMatchingRegistration(ServiceWorkerRegistration* registration);
   void RemoveMatchingRegistration(ServiceWorkerRegistration* registration);
 
   // An optimized implementation of [[Match Service Worker Registration]]
   // for current document.
   ServiceWorkerRegistration* MatchRegistration() const;
 
   // Called when our controller has been terminated and doomed due to an
   // exceptional condition like it could no longer be read from the script
   // cache.
-  void NotifyControllerLost();
+  void NotifyControllerLost(bool was_deleted);
+  bool controller_was_deleted() { return controller_was_deleted_; }
 
  private:
   friend class ForeignFetchRequestHandlerTest;
   friend class LinkHeaderServiceWorkerTest;
   friend class ServiceWorkerProviderHostTestP;
   friend class ServiceWorkerWriteToCacheJobTest;
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest, Update_SameScript);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest,
                            Update_SameSizeScript);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerWriteToCacheJobTest,
@@ skipping 93 matching lines @@
   // starts with. It is empty if IsContextSecureForServiceWorker() is
   // false.
   ServiceWorkerRegistrationMap matching_registrations_;
 
   std::unique_ptr<OneShotGetReadyCallback> get_ready_callback_;
   scoped_refptr<ServiceWorkerVersion> controlling_version_;
   scoped_refptr<ServiceWorkerVersion> running_hosted_version_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
   ServiceWorkerDispatcherHost* dispatcher_host_;
   bool allow_association_;
+  // TODO(falken): Remove once https://crbug.com/655910 is resolved.
+  bool controller_was_deleted_;
 
   std::vector<base::Closure> queued_events_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerProviderHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_