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Changes it into an analysis step rather that runs at the same time as
errorprone.

Removes ability to output .jar files from bytecode_processor. It now
outputs a stamp file.

TBR=agrieve # Renamed build variable.

Bug: 1080670
Change-Id: If98eb4e3673ccdfa47c151370b3f98aa23488a15
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2210873
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#771033}