Add AGP 3.0.0-beta6.

Bug: 66219151
Test: ./gradlew buildOnServer
Change-Id: I196a0e5a7ca03f283ee2f64271a6101c7a41569e
495 files changed
tree: 7ba3510cf2503dfc460307adea09008a41f94257
  1. com/
  2. net/
  3. org/
  4. .gitignore