Enable new multicol for testing and experimental web platform features.

Source/core/paint/DeprecatedPaintLayer.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 461 matching lines @@
     // Finally, make the visual rectangle relative to |ancestorLayer|.
     if (ancestorLayer->enclosingPaginationLayer() != paginationLayer) {
         rect.moveBy(paginationLayer->visualOffsetFromAncestor(ancestorLayer));
         return;
     }
     // The ancestor layer is inside the same pagination layer as |layer|, so we need to subtract
     // the visual distance from the ancestor layer to the pagination layer.
     rect.moveBy(-ancestorLayer->visualOffsetFromAncestor(paginationLayer));
 }
 
-bool DeprecatedPaintLayer::useRegionBasedColumns() const
-{
-    return layoutObject()->document().regionBasedColumnsEnabled();
-}
-
 void DeprecatedPaintLayer::updatePaginationRecursive(bool needsPaginationUpdate)
 {
     m_isPaginated = false;
     m_enclosingPaginationLayer = 0;
 
-    if (useRegionBasedColumns() && layoutObject()->isLayoutFlowThread())
+    if (RuntimeEnabledFeatures::regionBasedColumnsEnabled() && layoutObject()->isLayoutFlowThread())
         needsPaginationUpdate = true;
 
     if (needsPaginationUpdate)
         updatePagination();
 
     if (layoutObject()->hasColumns())
         needsPaginationUpdate = true;
 
     for (DeprecatedPaintLayer* child = firstChild(); child; child = child->nextSibling())
         child->updatePaginationRecursive(needsPaginationUpdate);
 }
 
 void DeprecatedPaintLayer::updatePagination()
 {
-    bool usesRegionBasedColumns = useRegionBasedColumns();
+    bool usesRegionBasedColumns = RuntimeEnabledFeatures::regionBasedColumnsEnabled();
     if ((!usesRegionBasedColumns && compositingState() != NotComposited) || !parent())
         return; // FIXME: For now the LayoutView can't be paginated.  Eventually printing will move to a model where it is though.
 
     // The main difference between the paginated booleans for the old column code and the new column code
     // is that each paginated layer has to paint on its own with the new code. There is no
     // recurring into child layers. This means that the m_isPaginated bits for the new column code can't just be set on
     // "roots" that get split and paint all their descendants. Instead each layer has to be checked individually and
     // genuinely know if it is going to have to split itself up when painting only its contents (and not any other descendant
     // layers). We track an enclosingPaginationLayer instead of using a simple bit, since we want to be able to get back
     // to that layer easily.
@@ skipping 341 matching lines @@
 
         if (positionedParent->layoutObject()->isRelPositioned() && positionedParent->layoutObject()->isLayoutInline()) {
             LayoutSize offset = toLayoutInline(positionedParent->layoutObject())->offsetForInFlowPositionedInline(*toLayoutBox(layoutObject()));
             localPoint += offset;
         }
     } else if (parent()) {
         // FIXME: This code is very wrong, but luckily only needed in the old/current multicol
         // implementation. The compositing system doesn't understand columns and we're hacking
         // around that fact by faking the position of the Layers when we think we'll end up
         // being composited.
-        if (hasStyleDeterminedDirectCompositingReasons() && !useRegionBasedColumns()) {
+        if (hasStyleDeterminedDirectCompositingReasons() && !RuntimeEnabledFeatures::regionBasedColumnsEnabled()) {
             // FIXME: Composited layers ignore pagination, so about the best we can do is make sure they're offset into the appropriate column.
             // They won't split across columns properly.
             if (!parent()->layoutObject()->hasColumns() && parent()->layoutObject()->isDocumentElement() && layoutObject()->view()->hasColumns())
                 localPoint += layoutObject()->view()->columnOffset(localPoint);
             else
                 localPoint += parent()->layoutObject()->columnOffset(localPoint);
         }
 
         if (parent()->layoutObject()->hasOverflowClip()) {
             IntSize scrollOffset = parent()->layoutBox()->scrolledContentOffset();
@@ skipping 1575 matching lines @@
     if (this != ancestorLayer && !hasVisibleContent() && !hasVisibleDescendant())
         return LayoutRect();
 
     // The root layer is always just the size of the document.
     if (isRootLayer())
         return LayoutRect(m_renderer->view()->unscaledDocumentRect());
 
     // The layer created for the LayoutFlowThread is just a helper for painting and hit-testing,
     // and should not contribute to the bounding box. The LayoutMultiColumnSets will contribute
     // the correct size for the rendered content of the multicol container.
-    if (useRegionBasedColumns() && layoutObject()->isLayoutFlowThread())
+    if (RuntimeEnabledFeatures::regionBasedColumnsEnabled() && layoutObject()->isLayoutFlowThread())
         return LayoutRect();
 
     LayoutRect result = clipper().localClipRect();
     if (result == LayoutRect::infiniteIntRect()) {
         LayoutPoint origin;
         result = physicalBoundingBox(ancestorLayer, &origin);
 
         const_cast<DeprecatedPaintLayer*>(this)->stackingNode()->updateLayerListsIfNeeded();
 
         // Reflections are implemented with Layers that hang off of the reflected layer. However,
@@ skipping 497 matching lines @@
     }
 }
 
 void showLayerTree(const blink::LayoutObject* renderer)
 {
     if (!renderer)
         return;
     showLayerTree(renderer->enclosingLayer());
 }
 #endif