[New Multicolumn] Actual support for layout of column-span:all.

Source/core/rendering/RenderMultiColumnSpannerSet.cpp

Index: Source/core/rendering/RenderMultiColumnSpannerSet.cpp
diff --git a/Source/core/rendering/RenderMultiColumnSpannerSet.cpp b/Source/core/rendering/RenderMultiColumnSpannerSet.cpp
index 69ae4f36398f84e73fb69e9fb029b7a511a12baf..d41b8b757de9777dcfb1be198c47b9f7c7fe6765 100644
--- a/Source/core/rendering/RenderMultiColumnSpannerSet.cpp
+++ b/Source/core/rendering/RenderMultiColumnSpannerSet.cpp
@@ -28,6 +28,18 @@ bool RenderMultiColumnSpannerSet::recalculateColumnHeight(BalancedHeightCalculat
     return false;
 }
 
+void RenderMultiColumnSpannerSet::computeLogicalHeight(LayoutUnit, LayoutUnit logicalTop, LogicalExtentComputedValues& computedValues) const
+{
+    computedValues.m_extent = m_rendererInFlowThread->logicalHeight();
+    computedValues.m_position = logicalTop;
+}
+
+LayoutUnit RenderMultiColumnSpannerSet::pageLogicalHeight() const
+{
+    ASSERT(!m_rendererInFlowThread->needsLayout());
+    return m_rendererInFlowThread->logicalHeight();
+}
+
 const char* RenderMultiColumnSpannerSet::renderName() const
 {
     return "RenderMultiColumnSpannerSet";