tree 6758b6936596525963edf6526f415ce34bd2345a
parent 5b42bf3ae3f494c339fe3b03ec55190c2986ba5c
author Keun-young Park <keunyoung@google.com> 1488230630 -0800
committer Keun-young Park <keunyoung@google.com> 1488312534 -0800

add base::WaitForPropertyCreation

- unlike base::WaitForProperty, which waits for specific value to
  be set, this one only waits until the property is created.

bug: 35178781
Test: added unit test
Change-Id: Idbf98c2152fe768357302f6b69310c55305f5d54