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This adds the standalone code for MojoLPM; it's not functional by
itself but it is a dependency for the generated code.

This is a cherrypick/split from
https://chromium-review.googlesource.com/c/chromium/src/+/2108507

Change-Id: I71deba7182adc31acde2546b42808a959a87b8a4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2109698Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Commit-Queue: Mark Brand <markbrand@google.com>
Cr-Commit-Position: refs/heads/master@{#751984}