Removed ScrollingCoordinator and a bunch of composited scrolling'

sky/engine/platform/scroll/ScrollableArea.cpp

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  * Copyright (C) 2008, 2011 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 99 matching lines @@
 }
 
 void ScrollableArea::setScrollOrigin(const IntPoint& origin)
 {
     if (m_scrollOrigin != origin) {
         m_scrollOrigin = origin;
         m_scrollOriginChanged = true;
     }
 }
 
-GraphicsLayer* ScrollableArea::layerForContainer() const
-{
-    return layerForScrolling() ? layerForScrolling()->parent() : 0;
-}
-
 bool ScrollableArea::scroll(ScrollDirection direction, ScrollGranularity granularity, float delta)
 {
     ScrollbarOrientation orientation;
 
     if (direction == ScrollUp || direction == ScrollDown)
         orientation = VerticalScrollbar;
     else
         orientation = HorizontalScrollbar;
 
     if (!userInputScrollable(orientation))
@@ skipping 57 matching lines @@
 
     IntPoint oldPosition = scrollPosition();
     // Tell the derived class to scroll its contents.
     setScrollOffset(position);
 
     Scrollbar* verticalScrollbar = this->verticalScrollbar();
 
     // Tell the scrollbars to update their thumb postions.
     if (Scrollbar* horizontalScrollbar = this->horizontalScrollbar()) {
         horizontalScrollbar->offsetDidChange();
-        if (horizontalScrollbar->isOverlayScrollbar() && !hasLayerForHorizontalScrollbar()) {
+        if (horizontalScrollbar->isOverlayScrollbar()) {
             if (!verticalScrollbar)
                 horizontalScrollbar->invalidate();
             else {
                 // If there is both a horizontalScrollbar and a verticalScrollbar,
                 // then we must also invalidate the corner between them.
                 IntRect boundsAndCorner = horizontalScrollbar->boundsRect();
                 boundsAndCorner.setWidth(boundsAndCorner.width() + verticalScrollbar->width());
                 horizontalScrollbar->invalidateRect(boundsAndCorner);
             }
         }
     }
     if (verticalScrollbar) {
         verticalScrollbar->offsetDidChange();
-        if (verticalScrollbar->isOverlayScrollbar() && !hasLayerForVerticalScrollbar())
+        if (verticalScrollbar->isOverlayScrollbar())
             verticalScrollbar->invalidate();
     }
 
     if (scrollPosition() != oldPosition)
         scrollAnimator()->notifyContentAreaScrolled(scrollPosition() - oldPosition);
 }
 
 bool ScrollableArea::scrollBehaviorFromString(const String& behaviorString, ScrollBehavior& behavior)
 {
     if (behaviorString == "auto")
@@ skipping 135 matching lines @@
         scrollbar->invalidate();
     }
 
     if (Scrollbar* scrollbar = verticalScrollbar()) {
         scrollbar->invalidate();
     }
 }
 
 void ScrollableArea::invalidateScrollbar(Scrollbar* scrollbar, const IntRect& rect)
 {
-    if (scrollbar == horizontalScrollbar()) {
-        if (GraphicsLayer* graphicsLayer = layerForHorizontalScrollbar()) {
-            graphicsLayer->setNeedsDisplay();
-            graphicsLayer->setContentsNeedsDisplay();
-            return;
-        }
-    } else if (scrollbar == verticalScrollbar()) {
-        if (GraphicsLayer* graphicsLayer = layerForVerticalScrollbar()) {
-            graphicsLayer->setNeedsDisplay();
-            graphicsLayer->setContentsNeedsDisplay();
-            return;
-        }
-    }
     invalidateScrollbarRect(scrollbar, rect);
 }
 
-bool ScrollableArea::hasLayerForHorizontalScrollbar() const
-{
-    return layerForHorizontalScrollbar();
-}
-
-bool ScrollableArea::hasLayerForVerticalScrollbar() const
-{
-    return layerForVerticalScrollbar();
-}
-
 bool ScrollableArea::scheduleAnimation()
 {
     WTF_LOG(ScriptedAnimationController, "ScrollableArea::scheduleAnimation: window = %d",
         hostWindow() ? 1 : 0);
     if (HostWindow* window = hostWindow()) {
         window->scheduleAnimation();
         return true;
     }
     return false;
 }
@@ skipping 26 matching lines @@
 {
     return scrollSize(orientation);
 }
 
 float ScrollableArea::pixelStep(ScrollbarOrientation) const
 {
     return 1;
 }
 
 } // namespace blink