tree ddd51bee77f166915932f3021bcb6983e2ce6d55
parent 8720f27a3081b402a62ee7a589d60346bac2ddc1
author Gary Miguel <garymm@google.com> 1578503171 +0000
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1578503171 +0000

Add child_build_id property

This will be used when re-running tests to skip the sub-build and
go straight to testing.

See design doc:
https://docs.google.com/document/d/1Jv6rHFwvXdafzpQik-a9fiv3G6YGL9ata_FT8RezOXM/edit#heading=h.ypsbql4vhbwa

Bug: 39904
Change-Id: I86432ba5f9a405d92ee71cf8dd8c600b50213e8f