Move to AGP 3.0.0-alpha6

Bug: 62578429
Test: ./gradlew buildOnServer for support library
Change-Id: Ib539bf793727b127376ee9645f339cc2bd3d3892
513 files changed
tree: 4cc7943e7b5c4508997470088448de0e35312470
  1. com/
  2. net/
  3. org/
  4. .gitignore