Pinpoint needs to request builds at specific revisions, e.g. clank@0123 + chromium/src@4567 + v8@89ab. It's not aware of the path of the repositories in the src tree, so it makes more sense to pass in the repository URLs instead.

Bug: https://github.com/catapult-project/catapult/issues/3394

Change-Id: Ib9fb9a7bf5d918c18f37c3b2b36418537512b235
Reviewed-on: https://chromium-review.googlesource.com/520569
Commit-Queue: David Tu <dtu@chromium.org>
Reviewed-by: Paweł Hajdan Jr. <phajdan.jr@chromium.org>