Upgrade emulator to emu-master-dev build 8499664 am: 21ed0f6dbf am: 825ca35034

Original change: https://googleplex-android-review.googlesource.com/c/platform/prebuilts/android-emulator/+/17965680

Change-Id: I92132f3e2680280ae58c611f0f634b10d2fc1ab4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>