[automerger skipped] Merge "Add build task for cts_root." am: b976c07d am:...

[automerger skipped] Merge "Add build task for cts_root." am: b976c07d am: 7b31d8bd am: 71deb5b1 -s ours

am skip reason: Change-Id I4732bf82d3cedc77e30d7fa5eff285d382992853 with SHA-1 434a3b77 is in history

Original change: https://android-review.googlesource.com/c/platform/build/+/1582998

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Idc1772c92e399379f07339e255648e69dc8618f8