gn format: penalty-based scheme for line breaking

tools/gn/format_test_data/047.gn

Index: tools/gn/format_test_data/047.gn
diff --git a/tools/gn/format_test_data/047.gn b/tools/gn/format_test_data/047.gn
new file mode 100644
index 0000000000000000000000000000000000000000..f1fdbeca8b5580b450918d1364e2dd18a641963f
--- /dev/null
+++ b/tools/gn/format_test_data/047.gn
@@ -0,0 +1,7 @@
+if (true) {
+  args += [ "--template" ] +
+      rebase_path(remoting_webapp_template_files, template_rel_dir)
+  args += [ "--dir-for-templates",
+            rebase_path(template_rel_dir, root_build_dir) ]
+  args += ["--js"] + rebase_path(remoting_webapp_main_html_js_files, template_rel_dir_and_some_more)
+}