Merge Android U (ab/10368041)

Bug: 291102124
Merged-In: I778414bff8458886319fd0e9e02ec8eb89ea3e54
Change-Id: I643052a45a96e692ab9a2d87b809c19264e26688
tree: 0c91b4fe0d116cc7024d552da86cfbfb4908f9ce
  1. Android.bp
  2. CarMessengerApp.apk
  3. OWNERS
  4. ReadMe.txt
  5. update_prebuilt.sh