am b8d890eb: Merge "Initial implementation of the download manager public API." into gingerbread

Merge commit 'b8d890ebc1923d98d19d24f396442c91eb766b16' into gingerbread-plus-aosp

* commit 'b8d890ebc1923d98d19d24f396442c91eb766b16':
  Initial implementation of the download manager public API.