(Partial update) Fix clipping area issue during window rotation

(Partial update) Fix clipping area issue during window rotation

When window rotation events come from ecore, the result will be stored
at mPositionSize, and send event message to render thread.

But when the event is not comes to render thread,
the window's size value (mPositionSize) and
the scene's size value (scene.GetCurrentSurfaceRect()) mismatched
So the clippingRect will calculate wrong value.

This patch make clipping area always use current scene surface

Change-Id: Id70fd2819b84314db5ef441512a7e042da1b1c81
Signed-off-by: Eunki, Hong <eunkiki.hong@samsung.com>