--- a/third_party/lss/BUILD.gn
+++ b/third_party/lss/BUILD.gn
@@ -0,0 +1,31 @@
+# Copyright 2019 The Crashpad Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import("../../build/crashpad_buildconfig.gni")
+
+config("lss_config") {
+  if (crashpad_is_in_chromium) {
+    defines = [ "CRASHPAD_LSS_SOURCE_EXTERNAL" ]
+  } else {
+    defines = [ "CRASHPAD_LSS_SOURCE_EMBEDDED" ]
+  }
+}
+
+source_set("lss") {
+  public_configs = [ ":lss_config" ]
+
+  sources = [
+    "lss.h",
+  ]
+}
--- a/third_party/lss/lss.h
+++ b/third_party/lss/lss.h
@@ -0,0 +1,26 @@
+// Copyright 2019 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_THIRD_PARTY_LSS_LSS_H_
+#define CRASHPAD_THIRD_PARTY_LSS_LSS_H_
+
+#if defined(CRASHPAD_LSS_SOURCE_EXTERNAL)
+#include "third_party/lss/linux_syscall_support.h"
+#elif defined(CRASHPAD_LSS_SOURCE_EMBEDDED)
+#include "third_party/lss/lss/linux_syscall_support.h"
+#else
+#error Unknown lss source
+#endif
+
+#endif  // CRASHPAD_THIRD_PARTY_LSS_LSS_H_