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Apparently older versions of GTK require IDs for all objects.

Change-Id: I01063d543623e4ae676616dc527a368252c080d0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865477
Commit-Queue: Erik Jensen <rkjnsn@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Auto-Submit: Erik Jensen <rkjnsn@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706559}