Add ArrayTraits<CArray<T>> utility template

gpu/ipc/common/mailbox_struct_traits.cc

Index: gpu/ipc/common/mailbox_struct_traits.cc
diff --git a/gpu/ipc/common/mailbox_struct_traits.cc b/gpu/ipc/common/mailbox_struct_traits.cc
index 0282ff128defad5986b8dc1c055da36c8dfe815c..6166eaf256c51e2c8e05683afbbc7d8e0fd1d18b 100644
--- a/gpu/ipc/common/mailbox_struct_traits.cc
+++ b/gpu/ipc/common/mailbox_struct_traits.cc
@@ -7,49 +7,17 @@
 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]);
-  return mailbox_name;
+  return {GL_MAILBOX_SIZE_CHROMIUM, GL_MAILBOX_SIZE_CHROMIUM,
+          const_cast<int8_t*>(&mailbox.name[0])};
 }
 
 // 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);
 }