am 8c9eacd9: Merge "DO NOT MERGE. Use the new -knowntags option to suppress warnings for some known tags." into gingerbread

Merge commit '8c9eacd9b9669642b052e3349d55c6a303f54b31' into gingerbread-plus-aosp

* commit '8c9eacd9b9669642b052e3349d55c6a303f54b31':
  DO NOT MERGE. Use the new -knowntags option to suppress warnings for some known tags.