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This will be leveraged in follow up CLs, to auto-generate parts of
webui_resources.grd.

Bug: 1132403
Change-Id: I5bd5f8a411c2cbc1f023220a779d74be209e902c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2489920Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#820148}