Add until directive from lit-html

lit-html's until directive will be needed in an upcoming CL
(https://crrev.com/c/2640576), adding it here separately for simplicity.

Bug: 1165710
Change-Id: I1a939bd45062370efd3b618ac856d0a9d10e437a
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2662824
Reviewed-by: Jack Franklin <[email protected]>
Commit-Queue: Wolfgang Beyer <[email protected]>
diff --git a/front_end/third_party/lit-html/BUILD.gn b/front_end/third_party/lit-html/BUILD.gn
index 5cacad4..efbf712 100644
--- a/front_end/third_party/lit-html/BUILD.gn
+++ b/front_end/third_party/lit-html/BUILD.gn
@@ -24,6 +24,9 @@
     "package/directives/style-map.d.ts",
     "package/directives/style-map.js",
     "package/directives/style-map.js.map",
+    "package/directives/until.d.ts",
+    "package/directives/until.js",
+    "package/directives/until.js.map",
     "package/lib/default-template-processor.d.ts",
     "package/lib/default-template-processor.js",
     "package/lib/default-template-processor.js.map",