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

Source/core/rendering/RenderMultiColumnSpannerSet.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/rendering/RenderMultiColumnSpannerSet.h"
 
 namespace blink {
 
 RenderMultiColumnSpannerSet* RenderMultiColumnSpannerSet::createAnonymous(RenderMultiColumnFlowThread* flowThread, RenderStyle* parentStyle, RenderBox* rendererInFlowThread)
@@ skipping 10 matching lines @@
     : RenderMultiColumnSet(flowThread)
     , m_rendererInFlowThread(rendererInFlowThread)
 {
 }
 
 bool RenderMultiColumnSpannerSet::recalculateColumnHeight(BalancedHeightCalculation calculationMode)
 {
     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";
 }
 
 }