Decouple Cache Storage messaging from Service Worker/Embedded Worker

content/renderer/service_worker/cache_storage_message_filter.h

+// 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.
+
+#ifndef CONTENT_RENDERER_SERVICE_WORKER_CACHE_STORAGE_MESSAGE_FILTER_H_
+#define CONTENT_RENDERER_SERVICE_WORKER_CACHE_STORAGE_MESSAGE_FILTER_H_
+
+#include "base/memory/ref_counted.h"
+#include "content/child/worker_thread_message_filter.h"
+
+namespace content {
+
+class CacheStorageMessageFilter : public WorkerThreadMessageFilter {
+ public:
+  explicit CacheStorageMessageFilter(ThreadSafeSender* thread_safe_sender);
+
+ protected:
+  ~CacheStorageMessageFilter() override;
+
+ private:
+  // WorkerThreadMessageFilter:
+  bool ShouldHandleMessage(const IPC::Message& msg) const override;
+  void OnFilteredMessageReceived(const IPC::Message& msg) override;
+  bool GetWorkerThreadIdForMessage(const IPC::Message& msg,
+                                   int* ipc_thread_id) override;
+
+  DISALLOW_COPY_AND_ASSIGN(CacheStorageMessageFilter);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_SERVICE_WORKER_CACHE_STORAGE_MESSAGE_FILTER_H_