Ensure files in Blimp engine bundle are group readable.
Ensure files in Blimp engine bundle are group readable.

Some build environments (like the buildbots) output files that aren't group readable.  This can cause a problem when doing a docker build because docker may not be able to read the files once it untars the bundle.  Makes sure all files in the bundle are group readable and are group executable if user executable.

BUG=577309
R=maniscalco@chromium.org

Review URL: https://codereview.chromium.org/1710423003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#377028}

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