Enable new multicol for testing and experimental web platform features.

Source/core/paint/DeprecatedPaintLayer.cpp

Index: Source/core/paint/DeprecatedPaintLayer.cpp
diff --git a/Source/core/paint/DeprecatedPaintLayer.cpp b/Source/core/paint/DeprecatedPaintLayer.cpp
index 4f930e09e83c7c3e2e6eb8c0f45159eea8ca9e38..5d70439d08a9bafe87cde8292b7d740f4ab4abf3 100644
--- a/Source/core/paint/DeprecatedPaintLayer.cpp
+++ b/Source/core/paint/DeprecatedPaintLayer.cpp
@@ -479,17 +479,12 @@ static void convertFromFlowThreadToVisualBoundingBoxInAncestor(const DeprecatedP
     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)
@@ -504,7 +499,7 @@ void DeprecatedPaintLayer::updatePaginationRecursive(bool 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.
 
@@ -871,7 +866,7 @@ bool DeprecatedPaintLayer::updateLayerPosition()
         // 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())
@@ -2463,7 +2458,7 @@ LayoutRect DeprecatedPaintLayer::boundingBoxForCompositing(const DeprecatedPaint
     // 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 layout content of the multicol container.
-    if (useRegionBasedColumns() && layoutObject()->isLayoutFlowThread())
+    if (RuntimeEnabledFeatures::regionBasedColumnsEnabled() && layoutObject()->isLayoutFlowThread())
         return LayoutRect();
 
     LayoutRect result = clipper().localClipRect();