An editable TextView caches text rendering inside an adaptive
number of sub display lists. The bounds of these use to be those
of the entire View.
This CL creates block display lists with tighten bounds, so that
(a still-to-be-implemented) quick rejection can occur.
Also cleaned-up the contradictory translations that were used to
handle the TextView's internal scroll and removed the invalidation
of display lists in that case.
TODO: When internal scroll sets a tighter clipping rect, quick
reject the creation and display of the clipped display lists.
Also renamed blockEnds to a more explicit blockEndLines.
Change-Id: I7d79bea78d06d19b6935aef75ff7aa7df2594050
157aafcbee