FreeType: fix garbled bitmap glyphs.
FreeType: fix garbled bitmap glyphs.

At some point (probably in one of the LCD patches), the fMaskFormat
for bitmap glyphs changed from kA8 to kBW. Formerly, bitmap glyphs
were always transformed into A8 format. With this patch, we check the
fMaskFormat and pick the correct transform at run time.

http://code.google.com/p/chromium/issues/detail?id=18531
http://codereview.appspot.com/104071


csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia