[automerger skipped] Support optional prop assignments am: d721e870bc
am: 54403635a4
-s ours am: ec1d03db26
-s ours
am skip reason: Change-Id I9c073a21c8257987cf2378012cadaeeeb698a4fb with SHA-1 598ea49881
is in history
Original change: https://android-review.googlesource.com/c/platform/build/+/1344820
Change-Id: I7aca05a3840c7fc39e88d90d749e4de07846fea5
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