Tease apart ServiceWorkerNetworkProvider from other stuff.

content/child/service_worker/service_worker_network_provider.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/child/service_worker/service_worker_network_provider.h"
+
+#include "base/atomic_sequence_num.h"
+#include "content/child/thread_safe_sender.h"
+#include "content/common/service_worker/service_worker_messages.h"
+
+namespace content {
+
+namespace {
+
+const char kUserDataKey[] = "SWProviderKey";
+
+// Must be unique in the child process.
+int GetNextProviderId() {
+  static base::StaticAtomicSequenceNumber sequence;
+  return sequence.GetNext() + 1;  // We want to start at 1.
+}
+
+}  // namespace
+
+void ServiceWorkerNetworkProvider::AttachToDocumentState(
+        base::SupportsUserData* datasource_userdata,
+        scoped_ptr<ServiceWorkerNetworkProvider> network_provider) {

[michaeln, 2014/02/28 02:04:03]

could use some DCHECKS about datasource_userdata not being null

+  datasource_userdata->SetUserData(&kUserDataKey, network_provider.release());
+}
+
+ServiceWorkerNetworkProvider* ServiceWorkerNetworkProvider::FromDocumentState(
+    base::SupportsUserData* datasource_userdata) {
+  return static_cast<ServiceWorkerNetworkProvider*>(
+      datasource_userdata->GetUserData(&kUserDataKey));
+}
+
+ServiceWorkerNetworkProvider::ServiceWorkerNetworkProvider(
+    ThreadSafeSender* thread_safe_sender)
+    : provider_id_(GetNextProviderId()),
+      thread_safe_sender_(thread_safe_sender) {
+  thread_safe_sender_->Send(

[kinuko, 2014/02/28 04:31:00]

nit: ChildThread::current()->Send is probably enough.

[michaeln, 2014/02/28 20:48:27]

Good point, Done.

+      new ServiceWorkerHostMsg_ProviderCreated(provider_id_));
+}
+
+ServiceWorkerNetworkProvider::~ServiceWorkerNetworkProvider() {
+  thread_safe_sender_->Send(
+      new ServiceWorkerHostMsg_ProviderDestroyed(provider_id_));
+}
+
+
+}  // namespace content