Run the WebGL conformance tests with the passthrough command decoder.

gpu/ipc/common/gpu_info_struct_traits.h

Index: gpu/ipc/common/gpu_info_struct_traits.h
diff --git a/gpu/ipc/common/gpu_info_struct_traits.h b/gpu/ipc/common/gpu_info_struct_traits.h
index ea76e0e279ea3fbb03a08d77e1a0c756347b611d..6dfa12c1ccbc698c2a5f459fe4d60edc8e2be422 100644
--- a/gpu/ipc/common/gpu_info_struct_traits.h
+++ b/gpu/ipc/common/gpu_info_struct_traits.h
@@ -243,6 +243,10 @@ struct StructTraits<gpu::mojom::GpuInfoDataView, gpu::GPUInfo> {
     return input.in_process_gpu;
   }
 
+  static bool passthrough_cmd_decoder(const gpu::GPUInfo& input) {
+    return input.passthrough_cmd_decoder;
+  }
+
   static gpu::CollectInfoResult basic_info_state(const gpu::GPUInfo& input) {
     return input.basic_info_state;
   }