Update DIR_METADATA for buganizer

Based of off crrev.com/5242327. Seems like "monorail" is
still referenced (at least for now).

No-Try: true
Change-Id: I4f3a062a6064bb95acd03bdcbdce822f53513354
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/187380
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
diff --git a/DIR_METADATA b/DIR_METADATA
index 0ca8187..a8b8113 100644
--- a/DIR_METADATA
+++ b/DIR_METADATA
@@ -1,3 +1,6 @@
-monorail {
-  component: "Internals>GPU>Dawn"
+monorail: {
+  component: "Dawn"
 }
+buganizer_public: {
+  component_id: 1570784
+}
\ No newline at end of file