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This is in preparation for using these defines in a new preprocessing-
only grit rule.

Bug: 1071641
Change-Id: I5414bc82d89b825ae6c40b910056030d08d4c163
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370087Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801529}