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And refactors how input_jars_paths and proguard_configs works a bit.

You can now any put any of these variables on any java target's
build_config.

Bug: 1105693
Change-Id: I332c0ea5637eb7778a12d1ddca3b5fddd54f308f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431788
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811243}