Decouple Cache Storage messaging from Service Worker/Embedded Worker

content/renderer/service_worker/cache_storage_message_filter.cc

+// Copyright 2015 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/renderer/service_worker/cache_storage_message_filter.h"
+
+#include "content/child/thread_safe_sender.h"
+#include "content/common/service_worker/cache_storage_messages.h"
+#include "content/renderer/service_worker/service_worker_cache_storage_dispatcher.h"
+
+namespace content {
+
+CacheStorageMessageFilter::CacheStorageMessageFilter(
+    ThreadSafeSender* thread_safe_sender)
+    : WorkerThreadMessageFilter(thread_safe_sender) {
+}
+
+CacheStorageMessageFilter::~CacheStorageMessageFilter() {
+}
+
+bool CacheStorageMessageFilter::ShouldHandleMessage(
+    const IPC::Message& msg) const {
+  return IPC_MESSAGE_CLASS(msg) == CacheStorageMsgStart;
+}
+
+void CacheStorageMessageFilter::OnFilteredMessageReceived(
+    const IPC::Message& msg) {
+  ServiceWorkerCacheStorageDispatcher::ThreadSpecificInstance(
+      thread_safe_sender())->OnMessageReceived(msg);
+}
+
+bool CacheStorageMessageFilter::GetWorkerThreadIdForMessage(
+    const IPC::Message& msg,
+    int* ipc_thread_id) {
+  return PickleIterator(msg).ReadInt(ipc_thread_id);
+}
+
+}  // namespace content