Tease apart ServiceWorkerNetworkProvider from other stuff.

content/child/service_worker/service_worker_network_provider.h

+// 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.
+
+#ifndef CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_NETWORK_PROVIDER_IMPL_H_
+#define CONTENT_CHILD_SERVICE_WORKER_SERVICE_WORKER_NETWORK_PROVIDER_IMPL_H_
+
+#include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/supports_user_data.h"
+#include "content/common/content_export.h"
+
+namespace content {
+
+// A unique provider_id is generated for each instance.
+// Instantiated prior to the main resource load being started and remains
+// allocated until after the last subresource load has occurred.
+// This is used to track the lifetime of a Document to create
+// and dispose the ServiceWorkerProviderHost in the browser process
+// to match its lifetime. Each request coming from the Document is
+// tagged with this id in willSendRequest.
+//
+// Basically, it's a scoped integer that sends an ipc upon construction
+// and destruction.
+class CONTENT_EXPORT ServiceWorkerNetworkProvider
+    : public base::SupportsUserData::Data {
+ public:
+  // Ownership is transferred to the DocumentState.
+  static void AttachToDocumentState(
+      base::SupportsUserData* document_state,
+      scoped_ptr<ServiceWorkerNetworkProvider> network_provider);
+
+  static ServiceWorkerNetworkProvider* FromDocumentState(
+      base::SupportsUserData* document_state);
+
+  ServiceWorkerNetworkProvider();
+  virtual ~ServiceWorkerNetworkProvider();
+
+  int provider_id() const { return provider_id_; }
+
+ private:
+  const int provider_id_;
+  DISALLOW_COPY_AND_ASSIGN(ServiceWorkerNetworkProvider);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_CHILD_SERVICE_WORKER_WEB_SERVICE_WORKER_PROVIDER_IMPL_H_