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We were including build config and android support library files in the
weblayer aar. We really only want to include the weblayer files in the
aar, since the app including it will provide the support library and
other things we need. This adds arguments to the dist_aar rule to
filter what goes into the jar files, similar to other java rules.

Change-Id: Id5393d06dac8b0d957469a3279c74199088f3732
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825567
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700338}