am 6b849e21: Unhide BitmapRegionDecoder.

Merge commit '6b849e2123be98eb2a1a25b8abf0b13a279ce952' into gingerbread-plus-aosp

* commit '6b849e2123be98eb2a1a25b8abf0b13a279ce952':
  Unhide BitmapRegionDecoder.