Implement StructTraits for various cc and gpu types

gpu/ipc/common/mailbox_struct_traits.h

+// Copyright 2016 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 GPU_IPC_COMMON_MAILBOX_STRUCT_TRAITS_H_
+#define GPU_IPC_COMMON_MAILBOX_STRUCT_TRAITS_H_
+
+#include "gpu/command_buffer/common/mailbox.h"
+#include "gpu/ipc/common/mailbox.mojom.h"
+#include "mojo/public/cpp/bindings/array_traits.h"
+
+namespace mojo {
+
+// A buffer used to read bytes directly from MailboxDataView to gpu::Mailbox
+// name.
+struct MailboxName {
+  int8_t* data;
+};
+
+// ArrayTraits needed for ReadName use with MailboxName.
+template <>
+struct ArrayTraits<MailboxName> {
+  using Element = int8_t;
+  static bool IsNull(const MailboxName& b);
+  static void SetToNull(MailboxName* b);
+  static size_t GetSize(const MailboxName& b);
+  static int8_t* GetData(MailboxName& b);
+  static const int8_t* GetData(const MailboxName& b);
+  static int8_t& GetAt(MailboxName& b, size_t i);
+  static const int8_t& GetAt(const MailboxName& b, size_t i);
+  static void Resize(MailboxName& b, size_t size);
+};
+
+template <>
+struct StructTraits<gpu::mojom::Mailbox, gpu::Mailbox> {
+  static MailboxName name(const gpu::Mailbox& mailbox);
+  static bool Read(gpu::mojom::MailboxDataView data, gpu::Mailbox* out);
+};
+
+}  // namespace mojo
+
+#endif  // GPU_IPC_COMMON_MAILBOX_STRUCT_TRAITS_H_