[WK2] Fix for fixed layer's wrong position for tizen.org

[WK2] Fix for fixed layer's wrong position for tizen.org

[Title] Fix for fixed layer's wrong position for tizen.org
[issue#] N_SE-55082
[Problem] Display error occurs due to wrong position of fixed layer
[Cause] After navigating to new page, new scroll position(0,0) is not updated on webProcess side  and it is still having the old scroll position.
[Solution] Update the new scroll position immediatly while navigation by calling setVisibleContentsRect.
           This change is already there in private branch.
[Developer] shanmuga.m

Change-Id: I41016a7f4d3f175c9167550e1211335d1ae3ea74