[automerger skipped] Make EphemeralTest test apks target API 26
am: eb4d66a17b -s ours
am skip reason: change_id Ib0fcd429463e36293f5c19f58b65ab2b76ffbed8 with SHA1 c7b91319c5 is in history

Change-Id: Ic5d3a8948850239039f45f96c406207f55afc1c5