Upgrade emulator to emu-master-dev build 6893349 am: ea0dd96967 am: 327477f3a2 am: a3f2ae454a

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

Change-Id: I8ff8bc7e2e1416a3f8046f3b800e4fbd024f022e