ServiceWorker: Enqueue state change events until the worker thread gets ready

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 <set>
 #include <vector>
 
@@ skipping 29 matching lines @@
 // document.
 //
 // Note this class can also host a running service worker, in which
 // case it will observe resource loads made directly by the service worker.
 class CONTENT_EXPORT ServiceWorkerProviderHost
     : public NON_EXPORTED_BASE(ServiceWorkerRegistration::Listener),
       public base::SupportsWeakPtr<ServiceWorkerProviderHost> {
  public:
   typedef base::Callback<void(bool)> FocusCallback;
 
+  // If |render_frame_id| is MSG_ROUTING_NONE, this provider host works for the
+  // worker context.
   ServiceWorkerProviderHost(int render_process_id,
                             int render_frame_id,
                             int provider_id,
                             base::WeakPtr<ServiceWorkerContextCore> context,
                             ServiceWorkerDispatcherHost* dispatcher_host);
   virtual ~ServiceWorkerProviderHost();
 
   int process_id() const { return render_process_id_; }
   int provider_id() const { return provider_id_; }
   int frame_id() const { return render_frame_id_; }
@@ skipping 94 matching lines @@
   void PrepareForCrossSiteTransfer();
   void CompleteCrossSiteTransfer(
       int new_process_id,
       int new_frame_id,
       int new_provider_id,
       ServiceWorkerDispatcherHost* dispatcher_host);
   ServiceWorkerDispatcherHost* dispatcher_host() const {
     return dispatcher_host_;
   }
 
-  // Called from ServiceWorkerRegistrationHandle.
+  // Sends event messages to the renderer. Events for the worker are queued up
+  // until the worker thread id is known via SetReadyToSendMessagesToWorker().
   void SendUpdateFoundMessage(
       const ServiceWorkerRegistrationObjectInfo& object_info);
   void SendSetVersionAttributesMessage(
       int registration_handle_id,
       ChangedVersionAttributesMask changed_mask,
       ServiceWorkerVersion* installing_version,
       ServiceWorkerVersion* waiting_version,
       ServiceWorkerVersion* active_version);
-
-  // Called from ServiceWorkerHandle.
   void SendServiceWorkerStateChangedMessage(
       int worker_handle_id,
       blink::WebServiceWorkerState state);
 
+  // Sets the worker thread id and flushes queued events.
+  void SetReadyToSendMessagesToWorker(int render_thread_id);
+
  private:
   friend class ServiceWorkerProviderHostTest;
   friend class ServiceWorkerWriteToCacheJobTest;
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerContextRequestHandlerTest,
                            UpdateBefore24Hours);
   FRIEND_TEST_ALL_PREFIXES(ServiceWorkerContextRequestHandlerTest,
                            UpdateAfter24Hours);
 
   // ServiceWorkerRegistration::Listener overrides.
   void OnRegistrationFailed(ServiceWorkerRegistration* registration) override;
   void OnSkippedWaiting(ServiceWorkerRegistration* registration) override;
 
   // Sets the controller version field to |version| or if |version| is NULL,
   // clears the field.
   void SetControllerVersionAttribute(ServiceWorkerVersion* version);
 
   void SendAssociateRegistrationMessage();
 
   // Increase/decrease this host's process reference for |pattern|.
   void IncreaseProcessReference(const GURL& pattern);
   void DecreaseProcessReference(const GURL& pattern);
 
+  bool IsReadyToSendMessages() const;
+  void Send(IPC::Message* message) const;
+
   int render_process_id_;
   int render_frame_id_;
+  int render_thread_id_;
   int provider_id_;
   GURL document_url_;
   GURL topmost_frame_url_;
 
   std::vector<GURL> associated_patterns_;
   scoped_refptr<ServiceWorkerRegistration> associated_registration_;
 
   scoped_refptr<ServiceWorkerVersion> controlling_version_;
   scoped_refptr<ServiceWorkerVersion> running_hosted_version_;
   base::WeakPtr<ServiceWorkerContextCore> context_;
   ServiceWorkerDispatcherHost* dispatcher_host_;
   bool allow_association_;
 
+  std::vector<base::Closure> queued_events_;
+
   DISALLOW_COPY_AND_ASSIGN(ServiceWorkerProviderHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SERVICE_WORKER_SERVICE_WORKER_PROVIDER_HOST_H_