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Run two compile_java steps in parallel, one without errorprone (~20s) to
unblock subsequent build steps (desugar, bytecode rewriting, dexing),
and one with errorprone (if enabled) to check the build (~40s).

This saves approximately 19 seconds for the overall incremental build of
chrome_java.

Bug: 906803
Change-Id: I4dee29c246bbc65791088dcc5e38d1030310c466
Reviewed-on: https://chromium-review.googlesource.com/c/1346992
Commit-Queue: Peter Wen <wnwen@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610477}