tree d20fdebb59ae8e91d335c85f1f1a103caf963735
parent b75f162a38c9a004e43a97665f92d08d4cefac99
author Nan Zhang <nanzhang@google.com> 1519162154 -0800
committer Dan Willemsen <dwillemsen@google.com> 1540103787 -0700

Restore "Use HAS_BUILD_NUMBER to check engineering build"

And use BUILD_NUMBER_FROM_FILE instead of BUILD_NUMBER to reduce build
reruns.

This was reverted in 6a2a9219b9ea3a2a9b56acd7038c9819f8959c35

Test: m -j32
Bug: b/70351683
Change-Id: I4ac6e62c716c05b103db3a3e09ec288a46149b18
Original-Change-Id: If5eb8891920ddd0486e263dd996f21efd36677c0