RenderLayer::scrollTo() should call FrameLoaderClient::didChangeScrollOffset()
https://bugs.webkit.org/show_bug.cgi?id=110673

Reviewed by Simon Fraser.

FrameLoaderClient::didChangeScrollOffset() should be called whenever something is 
actually being scrolled. 

* rendering/RenderLayer.cpp:
(WebCore::RenderLayer::scrollTo):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146260 268f45cc-cd09-0410-ab3c-d52691b4dbfc