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* trichrome_shared_assets GN arg
* references to o_mr1 and p in config.gni

Bug: 1003532
Change-Id: Ib3c9df5638ed8b336457b9dc9a450ffc9b578879
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1916681
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Richard Coles <torne@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#715411}