Upgrade emulator to emu-master-dev build 3840836 am: d3988c7d54
am: bc2e710df2

Change-Id: Id07c39cbb5e6f4b6ea8a0c7c937e80fab5ba8e48
tree: 4ad27ccf376efa74442353a2a4e64b66a73e4bb3
  1. darwin-x86_64/
  2. linux-x86_64/
  3. .gitignore
  4. NOTICE
  5. README
  6. update_emulator.sh