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gn analyze does not use depfile information, which causes it to not know
that builds need to happen when proguard flags change.

To work around this, this change marks the proguard_configs as inputs to
(somewhat arbitrary) java actions.

Bug: 827197
Change-Id: I1522daa0e3782ac1989cf4e234d8409663bf1357
Reviewed-on: https://chromium-review.googlesource.com/985900Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547799}