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And add step for ErrorProne.

Change-Id: Ic6054026e5c8d7b47a0f212499076b8f8d5ff8dd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1855470Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705118}