Add ArrayTraits<CArray<T>> utility template

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
-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
-bool ArrayTraits<MailboxName>::Resize(MailboxName& b, size_t size) {
-  return GL_MAILBOX_SIZE_CHROMIUM == size;
-}
-
-// 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]);
+  MailboxName mailbox_name = {GL_MAILBOX_SIZE_CHROMIUM,
+                              GL_MAILBOX_SIZE_CHROMIUM,
+                              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];
+  MailboxName mailbox_name = {0, GL_MAILBOX_SIZE_CHROMIUM, &out->name[0]};
   return data.ReadName(&mailbox_name);
 }
 
 }  // namespace mojo