Include net test data in the binary distribution (see issue #3348)

libcef/browser/test/test_helpers_impl.cc

@@ -0,0 +1,14 @@
+// Copyright (c) 2022 The Chromium Embedded Framework 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 "include/test/cef_test_helpers.h"
+
+#include "base/files/file_path.h"
+#include "base/path_service.h"
+
+void CefSetDataDirectoryForTests(const CefString& dir) {
+  base::PathService::OverrideAndCreateIfNeeded(
+      base::DIR_SRC_TEST_DATA_ROOT, base::FilePath(dir), /*is_absolute=*/true,
+      /*create=*/false);
+}