Add ArrayTraits<CArray<T>> utility template

gpu/ipc/common/mailbox_struct_traits.h

Index: gpu/ipc/common/mailbox_struct_traits.h
diff --git a/gpu/ipc/common/mailbox_struct_traits.h b/gpu/ipc/common/mailbox_struct_traits.h
index 4fd7f952ee33c5404c2e0e88462678711b3daaf7..817973363833ea5df9c01537790a12db54222e36 100644
--- a/gpu/ipc/common/mailbox_struct_traits.h
+++ b/gpu/ipc/common/mailbox_struct_traits.h
@@ -13,21 +13,7 @@ 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 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 bool Resize(MailboxName& b, size_t size);
-};
+using MailboxName = CArray<int8_t>;
 
 template <>
 struct StructTraits<gpu::mojom::Mailbox, gpu::Mailbox> {