WIP - improve ScrollableArea handling.

Source/core/layout/compositing/DeprecatedPaintLayerCompositor.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 360 matching lines @@
         CompositingRequirementsUpdater(m_layoutView, m_compositingReasonFinder).update(updateRoot);
 
         CompositingLayerAssigner layerAssigner(this);
         layerAssigner.assign(updateRoot, layersNeedingPaintInvalidation);
 
         bool layersChanged = layerAssigner.layersChanged();
 
         {
             TRACE_EVENT0("blink", "DeprecatedPaintLayerCompositor::updateAfterCompositingChange");
             if (const FrameView::ScrollableAreaSet* scrollableAreas = m_layoutView.frameView()->scrollableAreas()) {
-                for (auto* scrollableArea : *scrollableAreas)
+                for (ScrollableArea* scrollableArea : *scrollableAreas)
                     layersChanged |= scrollableArea->updateAfterCompositingChange();
             }
         }
 
         if (layersChanged)
             updateType = std::max(updateType, CompositingUpdateRebuildTree);
     }
 
     if (updateType != CompositingUpdateNone) {
         GraphicsLayerUpdater updater;
@@ skipping 814 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink