(DocumentWindow::scroll) : Clean up
[CSSOM] getComputedStyle must return the same object for the same element.

(ViewCSSImp::constructComputedStyle) : Refine
(DocumentWindow::setDocument) : Refine
(DocumentWindow::getComputedStyle, DocumentWindow::putComputedStyle) : New
(CSSStyleDeclarationImp::reset) : New
[CSSOM] getComputedStyle must return the most up-to-date values

(WindowImp::getComputedStyle) : Update the view before getting the result
(CSSStyleDeclarationImp::item) : Update the view before getting the result
(WindowImp::updateView) : New
(WindowImp::BackgroundTask::sleep) : Refine to wake up threads waiting at wait()
(WindowImp::BackgroundTask::wait) : New
(HTMLElementImp::getBox) : Refine to use the current view (not the most up-to-date one)
(CSSStyleDeclarationImp::setProperty) : Refine to use the current view (not the most up-to-date one)