Implement StructTraits for various cc and gpu types

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
new file mode 100644
index 0000000000000000000000000000000000000000..91d967ed27ec96d55f7a9b4f2949c83b4a5c3068
--- /dev/null
+++ b/gpu/ipc/common/mailbox_struct_traits.cc
@@ -0,0 +1,66 @@
+// 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;

[yzshen1, 2016/06/01 15:41:30]

This deson't actually affect gpu::Mailbox's contents, right?

If you never use a nullable MailboxName, you could consider removing IsNull and
SetToNull altogether.

+}
+
+// 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) {
+  DCHECK(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;
+}
+
+// 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