DO NOT MERGE - Merge pi-platform-release (PPRL.190505.001) into stage-aosp-master

Bug: 132622481
Change-Id: I91dbf16a1e49e138aa2fbc4a7e54fe8b0fc660a6
tree: 1a9bf1cd7918f7a6faae4268e86afa4b90745a16
  1. .gitignore
  2. OWNERS
  3. PREUPLOAD.cfg
  4. library/
  5. navigationbar/
  6. tools/