am 25ab3dcc: Merge "DO NOT MERGE - Add a -knowntags option to droiddoc" into gingerbread

Merge commit '25ab3dcce40bc2d19eeb99c7b36eeab52e4fa582' into gingerbread-plus-aosp

* commit '25ab3dcce40bc2d19eeb99c7b36eeab52e4fa582':
  DO NOT MERGE - Add a -knowntags option to droiddoc