Sample code: IPC Transport object for GPU

content/gpu/chrome_gpu_memory_buffer_service_ipc_transport.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_GPU_CHROME_GPU_MEMORY_BUFFER_SERVICE_IPC_TRANSPORT_H_
+#define CONTENT_GPU_CHROME_GPU_MEMORY_BUFFER_SERVICE_IPC_TRANSPORT_H_
+
+#include "content/gpu/gpu_memory_buffer_service_ipc_transport.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "ipc/message_filter.h"
+
+namespace IPC {
+class Message;
+class Sender;
+}
+
+namespace content {
+
+namespace {
+class GpuMemoryBufferServiceMessageFilter;
+}
+
+class ChromeGpuMemoryBufferServiceIPCTransport
+    : public GpuMemoryBufferServiceIPCTransport {
+ public:
+  static scoped_ptr<GpuMemoryBufferServiceIPCTransport> Create();
+
+  ~ChromeGpuMemoryBufferServiceIPCTransport() override;
+
+  // TODO(fsamuel): It shouldn't be necessary to expose this MessageFilter.
+  IPC::MessageFilter* filter() { return message_filter_.get(); }
+
+  // TODO(fsamuel): Add a BindToService once we have a
+  // ChromeGpuChildThreadIPCTransport.
+  // void BindToService(ChromeGpuChildThreadIPCTransport* channel_transport);
+ private:
+  friend class GpuMemoryBufferServiceMessageFilter;
+
+  ChromeGpuMemoryBufferServiceIPCTransport();
+
+  void CloseConnection();
+
+  // GpuMemoryBufferServiceIPCTrnasport implementation:
+  bool GpuMemoryBufferCreated(
+      const gfx::GpuMemoryBufferHandle& handle) override;
+  void SetClient(GpuMemoryBufferServiceIPCTransport::Client* client) override;
+
+  bool OnMessageReceived(const IPC::Message& message);
+
+  // Message handlers.
+  void OnCreateGpuMemoryBuffer(const CreateGpuMemoryBufferParams& params);
+  void OnCreateGpuMemoryBufferFromHandle(
+      const CreateGpuMemoryBufferFromHandleParams& params);
+
+  GpuMemoryBufferServiceIPCTransport::Client* client_;
+  IPC::Sender* sender_;
+  scoped_refptr<IPC::MessageFilter> message_filter_;
+  base::WeakPtrFactory<ChromeGpuMemoryBufferServiceIPCTransport> factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeGpuMemoryBufferServiceIPCTransport);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_GPU_CHROME_GPU_MEMORY_BUFFER_SERVICE_IPC_TRANSPORT_H_