Added bottom padding in textview's focused rectangle

Bug 6017386

Focused rect in used in ViewRoot when a new view takes focus.
TextView bringPointIntoView defines an other rectangle as text is typed.

Make sure the latter is included in the former to avoid the jump when one
starts typing text.

Change-Id: I0177adc046c77a5fd9c1423c0069d5b9798dc0b9