Implement StructTraits for various cc and gpu types

gpu/ipc/common/mailbox_holder_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_HOLDER_STRUCT_TRAITS_H_
+#define GPU_IPC_COMMON_MAILBOX_HOLDER_STRUCT_TRAITS_H_
+
+#include "gpu/command_buffer/common/mailbox_holder.h"
+#include "gpu/ipc/common/mailbox_holder.mojom.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<gpu::mojom::MailboxHolder, gpu::MailboxHolder> {
+  static gpu::Mailbox mailbox(const gpu::MailboxHolder& holder) {
+    return holder.mailbox;
+  }
+
+  static gpu::SyncToken sync_token(const gpu::MailboxHolder& holder) {
+    return holder.sync_token;
+  }
+
+  static uint32_t texture_target(const gpu::MailboxHolder& holder) {
+    return holder.texture_target;
+  }
+
+  static bool Read(gpu::mojom::MailboxHolderDataView data,
+                   gpu::MailboxHolder* out) {
+    gpu::Mailbox mailbox;
+    gpu::SyncToken sync_token;
+    if (!data.ReadMailbox(&mailbox) || !data.ReadSyncToken(&sync_token))
+      return false;
+    *out = gpu::MailboxHolder(mailbox, sync_token, data.texture_target());
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // GPU_IPC_COMMON_MAILBOX_HOLDER_STRUCT_TRAITS_H_