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The fetching script currently fetches about 2 GB (on my linux workstation)
from cloud storage serially. This can (and is) trivially parallelizable, and
should speed up the fetching script significantly.

This script has been taking 20 minutes on mac machines for a long time. This
will hopefully significantly speed the mac builders up.

Bug: 1102597
Change-Id: I93d2fa2b1f4b4ef6e27e9c894a9dd4c0d0e12d7b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2285503
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: Wenbin Zhang <wenbinzhang@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#786521}