Implement StructTraits for various cc and gpu types

cc/ipc/returned_resource_struct_traits.h

+// 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.
+
+#ifndef CC_IPC_RETURNED_RESOURCE_STRUCT_TRAITS_H_
+#define CC_IPC_RETURNED_RESOURCE_STRUCT_TRAITS_H_
+
+#include "cc/ipc/returned_resource.mojom.h"
+#include "cc/resources/returned_resource.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<cc::mojom::ReturnedResource, cc::ReturnedResource> {
+  static uint32_t id(const cc::ReturnedResource& resource) {
+    return resource.id;
+  }
+
+  static gpu::SyncToken sync_token(const cc::ReturnedResource& resource) {
+    return resource.sync_token;
+  }
+
+  static int32_t count(const cc::ReturnedResource& resource) {
+    return resource.count;
+  }
+
+  static bool lost(const cc::ReturnedResource& resource) {
+    return resource.lost;
+  }
+
+  static bool Read(cc::mojom::ReturnedResourceDataView data,
+                   cc::ReturnedResource* out) {
+    if (!data.ReadSyncToken(&out->sync_token))
+      return false;
+    out->id = data.id();
+    out->count = data.count();
+    out->lost = data.lost();
+    return true;
+  }
+};
+
+}  // namespace mojo
+
+#endif  // CC_IPC_RETURNED_RESOURCE_STRUCT_TRAITS_H_