cc: Implement UnionTraits for DrawQuads

cc/ipc/render_pass_struct_traits.cc

 // 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 "cc/ipc/render_pass_struct_traits.h"
 
 #include "base/numerics/safe_conversions.h"
 #include "cc/ipc/shared_quad_state_struct_traits.h"
 
 namespace mojo {
 
 // static
 bool StructTraits<cc::mojom::RenderPass, std::unique_ptr<cc::RenderPass>>::Read(
     cc::mojom::RenderPassDataView data,
     std::unique_ptr<cc::RenderPass>* out) {
   *out = cc::RenderPass::Create();
   if (!data.ReadId(&(*out)->id) || !data.ReadOutputRect(&(*out)->output_rect) ||
       !data.ReadDamageRect(&(*out)->damage_rect) ||
       !data.ReadTransformToRootTarget(&(*out)->transform_to_root_target)) {
     return false;
   }
   (*out)->has_transparent_background = data.has_transparent_background();
 
   mojo::ArrayDataView<cc::mojom::DrawQuadDataView> quads;
   data.GetQuadListDataView(&quads);
   cc::SharedQuadState* last_sqs = nullptr;
   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))
       return false;
 
     // Read the SharedQuadState.
     cc::mojom::SharedQuadStateDataView sqs_data_view;
     quad_data_view.GetSqsDataView(&sqs_data_view);
     // If there is no seralized SharedQuadState then used the last deseriaized
     // one.
     if (!sqs_data_view.is_null()) {
       last_sqs = (*out)->CreateAndAppendSharedQuadState();
       if (!quad_data_view.ReadSqs(last_sqs))
         return false;
     }
     quad->shared_quad_state = last_sqs;
     if (!quad->shared_quad_state)
       return false;
   }
   return true;
 }
 
 }  // namespace mojo