[New Multicolumn] Intrinsic/preferred logical width calculation for spanners.

Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp

Index: Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp
diff --git a/Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp b/Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp
index ddf778817f44548ba829445e84840bf5ec7b3b44..b776c355abd4eacd45ee6cbbfffcfc63203439f9 100644
--- a/Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp
+++ b/Source/core/rendering/RenderMultiColumnSpannerPlaceholder.cpp
@@ -53,6 +53,16 @@ bool RenderMultiColumnSpannerPlaceholder::needsPreferredWidthsRecalculation() co
     return m_rendererInFlowThread->needsPreferredWidthsRecalculation();
 }
 
+LayoutUnit RenderMultiColumnSpannerPlaceholder::minPreferredLogicalWidth() const
+{
+    return m_rendererInFlowThread->minPreferredLogicalWidth();
+}
+
+LayoutUnit RenderMultiColumnSpannerPlaceholder::maxPreferredLogicalWidth() const
+{
+    return m_rendererInFlowThread->maxPreferredLogicalWidth();
+}
+
 void RenderMultiColumnSpannerPlaceholder::layout()
 {
     ASSERT(needsLayout());