Add script to grab emulator prebuilts.

Bug: 325468469
Test: ./update-emu-prebuilts.sh <build_number>
Change-Id: I805fbc504fa308a76f948858c3caec53452fc054
1 file changed
tree: 9987073a9059eb059ba8415ee4cb3da002d27dbc
  1. darwin/
  2. generic/
  3. linux/
  4. windows/
  5. README.TXT
  6. update-emu-prebuilts.sh