Upgrade emulator to emu-master-dev build 6893349 am: ea0dd96967 am: 327477f3a2

Original change: https://android-review.googlesource.com/c/platform/prebuilts/android-emulator/+/1455232

Change-Id: I79ee79e3fbfbe5bf1c1c66c0ec02a420c0e3cdd5