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This is apparently used by ffmpeg's robosushi tool, when doing ffmpeg
rolls -- except they currently pull the SDK off a GCS bucket instead
of using cipd like Chromium normally does nowadays. This makes it
possible to make robosushi use the more common method.

Bug: 1098899
Change-Id: I0a2aea6cd0316e536bb3501801831817a5290def
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2277455
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784530}