Fix scaled-view droppings artifact

Sometimes views that are scaled leave behind rows/columns on the
screen as they move/scale around.

The problem was that the pivot point around which the scale takes place
(in the default case of scaling around the center of the view)
was getting truncated to integer coordinates in the display list.
Meanwhile, the pivot point at the Java level was using the true float
values, resulting in a mis-match between the invalidation rectangle
(computed at the Java level) and the drawing-operation rectangle (computed
at the native level).

This only occurred when views had odd bounds (thus the integer representation
of the center differed from the float representation of the center), and only
when some other drawing operation would expand the clip rect to allow the
incorrect drawing operation (using the wrong pivot point) to draw outside of
its clip boundaries.

Issue #8617023 7x7 screen not updated correctly

Change-Id: If88889b9450d34535df732b78077a29b1f24802d