thestig@ reminds me we do have linux x86 bots on the waterfall. Add them
to the read64le party. Minor: run git cl format over BUILD.gn, and add a
line space here and there for readability.

Bug: 760853
Change-Id: Ia47296a26bff77f9be699e31053d8b94aac583f4
Reviewed-on: https://chromium-review.googlesource.com/910328


Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Noel Gordon <noel@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#535612}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b07c92a12d39e1ac51fe0dab8e4cb98f91f0d213