Always invalidate TextView on checkForRelayout

Previously we would check whether relayout was required and optionally
invalidate; however, with partial layout we leave this work for the
makeNewLayout() method. We still need to manually invalidate, though,
since makeNewLayout() does not handle invalidation.

Bug: 25857300
Change-Id: I81ef9062c9fb4964d5e42a3562e6c782492ad65f