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Normally, compiling Android resources requires unpacking
and processing resource dependencies into a temporary
directory before sending the result to 'aapt2 compile',
then getting rid of these intermediate files.

To help debug issues related to Android resource compilation,
this CL introduces a new GN variable that can be set in your
args.gn, to force the build to put all such build directories
under a top-level directory, and not removing intermediate
files in it.

This should allow inspecting the intermediate files to better
understand what's going on.

This is needed to debug issues that appeared in my attempt
to change the resources stored in APKs versus bundles, e.g.:
https://chromium-review.googlesource.com/c/chromium/src/+/1270947

BUG=879228,882860,897056
R=agrieve@chromium.org, estevenson@chromium.org,yfriedman@chromium.org

Change-Id: I76c79a893b0bbdb56ba685f4304da929d11c7e05
Reviewed-on: https://chromium-review.googlesource.com/c/1288436Reviewed-by: agrieve <agrieve@chromium.org>
Commit-Queue: David Turner <digit@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601178}