Remove a bunch of frame-level scrolling machinery.

sky/engine/core/rendering/RenderLayerClipper.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 51 matching lines @@
         clipRects.setPosClipRect(clipRects.overflowClipRect());
     } else if (position == AbsolutePosition) {
         clipRects.setOverflowClipRect(clipRects.posClipRect());
     }
 }
 
 static void applyClipRects(const ClipRectsContext& context, RenderObject& renderer, LayoutPoint offset, ClipRects& clipRects)
 {
     ASSERT(renderer.hasOverflowClip() || renderer.hasClip());
 
-    RenderView* view = renderer.view();
-    ASSERT(view);
-    if (clipRects.fixed() && context.rootLayer->renderer() == view)
-        offset -= view->frameView()->scrollOffsetForFixedPosition();
-
     if (renderer.hasOverflowClip()) {
         ClipRect newOverflowClip = toRenderBox(renderer).overflowClipRect(offset, context.scrollbarRelevancy);
         newOverflowClip.setHasRadius(renderer.style()->hasBorderRadius());
         clipRects.setOverflowClipRect(intersection(newOverflowClip, clipRects.overflowClipRect()));
         if (renderer.isPositioned())
             clipRects.setPosClipRect(intersection(newOverflowClip, clipRects.posClipRect()));
     }
 
     if (renderer.hasClip()) {
         LayoutRect newClip = toRenderBox(renderer).clipRect(offset);
@@ skipping 235 matching lines @@
 {
     ASSERT(m_renderer.layer()->parent());
     ASSERT(m_renderer.view());
 
     ClipRects parentClipRects;
     if (m_renderer.layer() == context.rootLayer)
         parentClipRects.reset(PaintInfo::infiniteRect());
     else
         m_renderer.layer()->parent()->clipper().getOrCalculateClipRects(context, parentClipRects);
 
-    ClipRect result = backgroundClipRectForPosition(parentClipRects, m_renderer.style()->position());
-
-    // Note: infinite clipRects should not be scrolled here, otherwise they will accidentally no longer be considered infinite.
-    if (parentClipRects.fixed() && context.rootLayer->renderer() == m_renderer.view() && result != PaintInfo::infiniteRect())
-        result.move(m_renderer.view()->frameView()->scrollOffsetForFixedPosition());
-
-    return result;
+    return backgroundClipRectForPosition(parentClipRects, m_renderer.style()->position());
 }
 
 void RenderLayerClipper::getOrCalculateClipRects(const ClipRectsContext& context, ClipRects& clipRects) const
 {
     if (context.usesCache())
         clipRects = *getClipRects(context);
     else
         calculateClipRects(context, clipRects);
 }
 
@@ skipping 15 matching lines @@
         ASSERT(current);
         if (current->transform() || current->isPaintInvalidationContainer())
             return const_cast<RenderLayer*>(current);
     }
 
     ASSERT_NOT_REACHED();
     return 0;
 }
 
 } // namespace blink