Merge Android R

Bug: 168057903
Merged-In: I4e01fbf5d6fd342573625b6e3ad0c2a387432920
Change-Id: Ibe1448b925ebe41ea8fa9ed4c76e5291df6bf2eb
tree: 99a6f20963d7d89d8fd066d42841932fd0a0f7e9
  1. library/
  2. tools/
  3. .gitignore
  4. OWNERS
  5. PREUPLOAD.cfg