Implement StructTraits for various cc and gpu types

gpu/ipc/common/mailbox_struct_traits.cc

+// 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.
+
+#include "gpu/ipc/common/mailbox_struct_traits.h"
+
+namespace mojo {
+
+// static
+bool ArrayTraits<MailboxName>::IsNull(const MailboxName& b) {
+  return b.data == nullptr;
+}
+
+// static
+void ArrayTraits<MailboxName>::SetToNull(MailboxName* b) {
+  b->data = nullptr;
+}
+
+// static
+size_t ArrayTraits<MailboxName>::GetSize(const MailboxName& b) {
+  return GL_MAILBOX_SIZE_CHROMIUM;
+}
+
+// static
+int8_t* ArrayTraits<MailboxName>::GetData(MailboxName& b) {
+  return b.data;
+}
+
+// static
+const int8_t* ArrayTraits<MailboxName>::GetData(const MailboxName& b) {
+  return b.data;
+}
+
+// static
+int8_t* ArrayTraits<MailboxName>::GetAt(MailboxName& b, size_t i) {
+  return b.data + i;
+}
+
+// static
+const int8_t* ArrayTraits<MailboxName>::GetAt(const MailboxName& b, size_t i) {
+  return b.data + i;
+}
+
+// static
+void ArrayTraits<MailboxName>::Resize(MailboxName& b, size_t size) {
+  CHECK(GL_MAILBOX_SIZE_CHROMIUM == size);

[piman, 2016/05/31 16:08:49]

nit: DCHECK

+}
+
+// static
+MailboxName StructTraits<gpu::mojom::Mailbox, gpu::Mailbox>::name(
+    const gpu::Mailbox& mailbox) {
+  MailboxName mailbox_name;
+  mailbox_name.data = const_cast<int8_t*>(&mailbox.name[0]);
+  return mailbox_name;
+}
+
+// static
+bool StructTraits<gpu::mojom::Mailbox, gpu::Mailbox>::Read(
+    gpu::mojom::MailboxDataView data,
+    gpu::Mailbox* out) {
+  MailboxName mailbox_name;
+  mailbox_name.data = &out->name[0];
+  return data.ReadName(&mailbox_name);
+}
+
+}  // namespace mojo