Implement StructTraits for various cc and gpu types

gpu/ipc/common/traits_test_service.mojom

Index: gpu/ipc/common/traits_test_service.mojom
diff --git a/gpu/ipc/common/traits_test_service.mojom b/gpu/ipc/common/traits_test_service.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..4097e5659d0c33048057c3acb049a53f907811bc
--- /dev/null
+++ b/gpu/ipc/common/traits_test_service.mojom
@@ -0,0 +1,15 @@
+// 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.
+
+module gpu.mojom;
+
+import "gpu/ipc/common/mailbox.mojom";
+import "gpu/ipc/common/mailbox_holder.mojom";
+import "gpu/ipc/common/sync_token.mojom";
+
+interface TraitsTestService {
+  EchoMailbox(Mailbox m) => (Mailbox pass);
+  EchoMailboxHolder(MailboxHolder m) => (MailboxHolder pass);
+  EchoSyncToken(SyncToken s) => (SyncToken pass);
+};