Reviewed by darin.

        Push more of MacFrame down into Frame.
        Add visibleContentRect method to ScrollView.

        * bridge/mac/MacFrame.h:
        * bridge/mac/MacFrame.mm:
        (WebCore::MacFrame::imageFromRect):
        (WebCore::MacFrame::setDisplaysWithFocusAttributes):
        (WebCore::MacFrame::bodyBackgroundColor):
        * bridge/mac/WebCoreFrameBridge.mm:
        * page/Frame.cpp:
        (WebCore::Frame::visibleSelectionRect):
        (WebCore::Frame::setDisplaysWithFocusAttributes):
        * page/Frame.h:
        * platform/ScrollView.h:
        * platform/mac/ScrollViewMac.mm:
        (WebCore::ScrollView::visibleWidth):
        (WebCore::ScrollView::visibleHeight):
        (WebCore::ScrollView::visibleContentRect):
        (WebCore::ScrollView::contentsWidth):
        (WebCore::ScrollView::contentsHeight):
        (WebCore::ScrollView::contentsX):
        (WebCore::ScrollView::contentsY):
        (WebCore::ScrollView::scrollXOffset):
        (WebCore::ScrollView::scrollYOffset):
        (WebCore::ScrollView::inWindow):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@13327 268f45cc-cd09-0410-ab3c-d52691b4dbfc