cc: Implement UnionTraits for DrawQuads

cc/ipc/render_pass_struct_traits.cc

Index: cc/ipc/render_pass_struct_traits.cc
diff --git a/cc/ipc/render_pass_struct_traits.cc b/cc/ipc/render_pass_struct_traits.cc
index 61ed5b980a7ecaa13b480271dd79b9b5d255734f..d8396a4176abfd87a89f4c31a830c052d99b1cc7 100644
--- a/cc/ipc/render_pass_struct_traits.cc
+++ b/cc/ipc/render_pass_struct_traits.cc
@@ -27,8 +27,11 @@ bool StructTraits<cc::mojom::RenderPass, std::unique_ptr<cc::RenderPass>>::Read(
   for (size_t i = 0; i < quads.size(); ++i) {
     cc::mojom::DrawQuadDataView quad_data_view;
     quads.GetDataView(i, &quad_data_view);
+    cc::mojom::DrawQuadStateDataView quad_state_data_view;
+    quad_data_view.GetDrawQuadStateDataView(&quad_state_data_view);
+
     cc::DrawQuad* quad =
-        AllocateAndConstruct(quad_data_view.material(), &(*out)->quad_list);
+        AllocateAndConstruct(quad_state_data_view.tag(), &(*out)->quad_list);
     if (!quad)
       return false;
     if (!quads.Read(i, quad))