[WK2] WEB-2776 Page not displaying selected item via context menu

[WK2] WEB-2776 Page not displaying selected item via context menu

[Version] N/A
[Project] TIZEN BROWSER
[Title] WEB-2776 Page not displaying selected item via contextmenu
[BinType] N/A
[Customer] N/A
[Issue#] when the link(e.g htttp://morellc.com/#moreinfo)
 contain hash anchor to current page, the webprocess decide
scroll position when parsing is finished, before page is
rendered fully.But didRenderFrame initializes the scrollPosition to
default position(0,0) thus resetting the old value
of scrollPosition. So resetting the scroll position.
So  that page doesnot scroll upto anchor node

[Problem] page doesnot get scrolled by default when scroll position
is decided before page is rendered completely
[Cause] NA
[Solution] Remmebered the scrollposition(before the page is rendered completely)
and restore that when page is rendered
[Team] Browser(WCS)
[Developer] Santosh Mahto(santosh.ma)

Change-Id: If0fabe8c79be694db9f624f2f26c02776a579b72