am 87bb1857: Merge changes I2337051b,I19b426cb into gingerbread

Merge commit '87bb18579a5eea2e24af78af8c0f54f5455ce8fd' into gingerbread-plus-aosp

* commit '87bb18579a5eea2e24af78af8c0f54f5455ce8fd':
  Tweak ObbFile class
  Allow things that can install packages to set Obb paths