Add domain-specific language for BPF policies

sandbox/linux/BUILD.gn

Index: sandbox/linux/BUILD.gn
diff --git a/sandbox/linux/BUILD.gn b/sandbox/linux/BUILD.gn
index 0cc9be4562a5576b6ac90132b913c8a36bc080a6..ecaf17b7916988cee9510b8ad8b84d0d30756725 100644
--- a/sandbox/linux/BUILD.gn
+++ b/sandbox/linux/BUILD.gn
@@ -90,6 +90,8 @@ test("sandbox_linux_unittests") {
   if (use_seccomp_bpf) {
     sources += [
       "seccomp-bpf-helpers/baseline_policy_unittest.cc",
+      "seccomp-bpf-helpers/bpf_dsl_unittest.cc",
+      "seccomp-bpf-helpers/cons_unittest.cc",
       "seccomp-bpf/bpf_tests_unittest.cc",
       "seccomp-bpf/codegen_unittest.cc",
       "seccomp-bpf/errorcode_unittest.cc",
@@ -162,6 +164,9 @@ component("seccomp_bpf_helpers") {
   sources = [
     "seccomp-bpf-helpers/baseline_policy.cc",
     "seccomp-bpf-helpers/baseline_policy.h",
+    "seccomp-bpf-helpers/bpf_dsl.cc",
+    "seccomp-bpf-helpers/bpf_dsl.h",
+    "seccomp-bpf-helpers/cons.h",
     "seccomp-bpf-helpers/sigsys_handlers.cc",
     "seccomp-bpf-helpers/sigsys_handlers.h",
     "seccomp-bpf-helpers/syscall_parameters_restrictions.cc",