Remove more frame-level scrolling machinery.

sky/engine/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 348 matching lines @@
 {
     if (m_overflowControlsHostLayer)
         m_overflowControlsHostLayer->setPosition(contentsOffset);
 }
 
 void RenderLayerCompositor::frameViewDidChangeSize()
 {
     if (m_containerLayer) {
         FrameView* frameView = m_renderView.frameView();
         m_containerLayer->setSize(frameView->unscaledVisibleContentSize());
-
-        frameViewDidScroll();
         updateOverflowControlsLayers();
     }
 }
 
-enum AcceleratedFixedRootBackgroundHistogramBuckets {
-    ScrolledMainFrameBucket = 0,
-    ScrolledMainFrameWithAcceleratedFixedRootBackground = 1,
-    ScrolledMainFrameWithUnacceleratedFixedRootBackground = 2,
-    AcceleratedFixedRootBackgroundHistogramMax = 3
-};
-
-void RenderLayerCompositor::frameViewDidScroll()
-{
-    FrameView* frameView = m_renderView.frameView();
-    IntPoint scrollPosition = frameView->scrollPosition();
-
-    if (!m_scrollLayer)
-        return;
-
-    // Scroll position = scroll minimum + scroll offset. Adjust the layer's
-    // position to handle whatever the scroll coordinator isn't handling.
-    // The minimum scroll position is non-zero for RTL pages with overflow.
-    m_scrollLayer->setPosition(-scrollPosition);
-
-
-    Platform::current()->histogramEnumeration("Renderer.AcceleratedFixedRootBackground",
-        ScrolledMainFrameBucket,
-        AcceleratedFixedRootBackgroundHistogramMax);
-}
-
 void RenderLayerCompositor::rootFixedBackgroundsChanged()
 {
     if (!supportsFixedRootBackgroundCompositing())
         return;
 
     // To avoid having to make the fixed root background layer fixed positioned to
     // stay put, we position it in the layer tree as follows:
     //
     // + Overflow controls host
     //   + LocalFrame clip
@@ skipping 474 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink