Introduce ServiceWorkerHandle for tracking WebServiceWorkerImpl reference

content/browser/service_worker/service_worker_version.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_VERSION_H_
 #define CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 50 matching lines @@
     NEW,         // The version is just created.
     INSTALLING,  // Install event is dispatched and being handled.
     INSTALLED,   // Install event is finished and is ready to be activated.
     ACTIVATING,  // Activate event is dispatched and being handled.
     ACTIVE,      // Activation is finished and can run as active.
     DEACTIVATED, // The version is no longer running as active, due to
                  // unregistration or replace. (TODO(kinuko): we may need
                  // different states for different termination sequences)
   };
 
+  class Listener {
+   public:
+    virtual void OnVersionStateChanged() = 0;
+  };
+
   ServiceWorkerVersion(
       ServiceWorkerRegistration* registration,
       int64 version_id,
       base::WeakPtr<ServiceWorkerContextCore> context);
 
   int64 version_id() const { return version_id_; }
-  ServiceWorkerRegistration* registration() { return registration_.get(); }
-
-  void Shutdown();
-  bool is_shutdown() const { return is_shutdown_; }
+  int64 registration_id() const { return registration_id_; }
 
   RunningStatus running_status() const {
     return static_cast<RunningStatus>(embedded_worker_->status());
   }
 
   ServiceWorkerVersionInfo GetInfo();
 
   Status status() const { return status_; }
 
   // This sets the new status and also run status change callbacks
@@ skipping 88 matching lines @@
                                  const IPC::Message& message) OVERRIDE;
 
  private:
   typedef ServiceWorkerVersion self;
   typedef std::set<ServiceWorkerProviderHost*> ProviderHostSet;
   friend class base::RefCounted<ServiceWorkerVersion>;
 
   virtual ~ServiceWorkerVersion();
 
   const int64 version_id_;
+  int64 registration_id_;
+  GURL script_url_;
   Status status_;
-  bool is_shutdown_;
-  scoped_refptr<ServiceWorkerRegistration> registration_;
   scoped_ptr<EmbeddedWorkerInstance> embedded_worker_;
   std::vector<StatusCallback> start_callbacks_;
   std::vector<StatusCallback> stop_callbacks_;
   std::vector<base::Closure> status_change_callbacks_;
   IDMap<MessageCallback, IDMapOwnPointer> message_callbacks_;
 
   ProviderHostSet controllee_providers_;
 
   base::WeakPtrFactory<ServiceWorkerVersion> weak_factory_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerVersion);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_VERSION_H_