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This is a reland of 8ab0b856

Original change's description:
> Parallelize fetching telemetry benchmark deps
> 
> 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}

Bug: 1102597
Change-Id: I37d0055fadb26bf4eae2b0b5fe0ecc4732edde3d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2288740
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789736}