Make BitmapFactory.Options API Changes

This changes the documentation for inPreferQualityOverSpeed,
inDither, and requestCancelDecode().

These changes are a result of modifying the backends of
BitmapFactory and BitmapRegionDecoder to be faster, higher quality,
and to use standard libraries.

BUG:26266063
BUG:25556965
Change-Id: I9008fd276a38c737e242bcc6930ffe4e36d9fd1d
5 files changed