Let CornerRadius / Borderline works on very small visual

Let CornerRadius / Borderline works on very small visual

We setup the range of anti-alias as fixed value; 1.0.
It cause we only assume that user will use this visual at pixel-unit.

But if we try to use ImageView / Control in 3D world,
The size of visual can be smaller than 1.0.
In this case, CornerRadius / Borderline break down.

This patch make the range of anti-alias relative with visual size.
So even if we setup the view size smaller than 1.0,
it will show the result like 50x50 size of visual.

Change-Id: I17614783c2ec8c4a38b51330ba166160d7d4db16
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>