Upgrade emulator to emu-master-dev build 4104019
am: b4d74283d3  -s ours

Change-Id: If2cc279555c7d72d9ab101bce1ce4913806582f4
tree: 231fcd3567643231ee5fa842d3e8a1ca4ab79ab4
  1. darwin-x86_64/
  2. linux-x86_64/
  3. .gitignore
  4. NOTICE
  5. README
  6. update_emulator.sh