Add AGP 3.0.0 beta 2 to prebuilts.
am: 99070836ef

Change-Id: Ie9954f9aea4281563ac5c3d2e49af88e76fe137c
tree: 50f2b703f2cdcdd273b54b9b7a300cce6fd0aa41
  1. com/
  2. net/
  3. org/
  4. .gitignore