Upgrade emulator to emu-master-dev build 3939570 am: 89fbf2893b am: e54ed348b8 am: a01daa9cab
am: f6be4613e9

Change-Id: Ibd10208d55de942a80ce0e0be2e9a7e7c56aaf85
tree: 1194823829bb02a7946e246ad660ff5df6c0ca22
  1. darwin-x86_64/
  2. linux-x86_64/
  3. .gitignore
  4. NOTICE
  5. README
  6. update_emulator.sh