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We can get gzipped flag from gzipped_resource_map_source or
gzipped_resource_file_map_source and use it to unpack gzipped resources
with unpack.py.

Bug: 738243
Change-Id: I1bf56126f702fa6efbd2b3e8806ade9bdf904d1f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1518520
Commit-Queue: Dmitry Guketlev <yavanosta@yandex-team.ru>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#640738}