Compose singleLine & textAllCaps transforms

TextView only supports a single TransformationMethod per TextView, and
singleLine and textAllCaps are both implemented as
TransformationMethods. Composing both operations into a single
TransformationMethod gives us all-caps text (if requested by
kg_use_all_caps) on a single line.

Bug: 11421105
Change-Id: I069721b887ea90b8daf2af2cf82081319e499962