Merge Android Pie into master

Bug: 112104996
Change-Id: Idd2cac4993546ed13475d305bfda2169f8695847
tree: cc9e5433ecb65a9beaf1d1f02d435ddb0d784ad0
  1. BUILD.gn
  2. DEPS
  3. proguard.flags
  4. src/