ScrollPoint is not coming properly in page reload.

ScrollPoint is not coming properly in page reload.

[Version]    N/A
[Project]    Redwood
[Title]      Reload On the Page after scroll should not comes to the start position.
[BinType]    N/A
[Customer]   HQ
[Issue#]     WEB-3334
[Problem]    ScrollPosition are getting set to 0,0
[Cause]      setVisibleContent() from initializeVisibleContentRect() in PageClientImpl.cpp is setting m_visibleContectRect to 0,0
[Solution]   code added to restore scroll position that will frame load notification come.
[Team]       WebCoreSupport
[Developer]  deepak.m1@samsung.com
[Request]    N/A
[Horizontal expansion] N/A
[SCMRequest] NA

Change-Id: I2ace399f2546cb0fe0107eb7f4621c5a899845d7