am 389a440a: Backport ParcelFileDescriptor.createPipe() from master.

Merge commit '389a440ad13f7b16e8f7c7f1670bdd55f1e2112a' into gingerbread-plus-aosp

* commit '389a440ad13f7b16e8f7c7f1670bdd55f1e2112a':
  Backport ParcelFileDescriptor.createPipe() from master.