Implement StructTraits for various cc and gpu types

gpu/ipc/common/BUILD.gn

 # 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.
 
 import("//build/config/ui.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 group("common") {
   if (is_component_build) {
     public_deps = [
@@ skipping 107 matching lines @@
 
 mojom("interfaces") {
   sources = [
     "capabilities.mojom",
     "command_buffer.mojom",
     "mailbox.mojom",
     "mailbox_holder.mojom",
     "sync_token.mojom",
   ]
 }
+
+mojom("test_interfaces") {
+  testonly = true
+  sources = [
+    "traits_test_service.mojom",
+  ]
+
+  public_deps = [
+    ":interfaces",
+  ]
+}