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Adds GN arg: java_warnings_as_errors = !is_java_debug

And sets the arg on our trybot that runs errorprone.

TBR=jbudorick  # Expedite fixing local dev flow.

Bug: 1029357
Change-Id: I817931328dc56ca67d7047d711fa60ba38e21fd6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1943014
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720074}