Deduct pagination struts when calculating initial column height.

third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h

Index: third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h
diff --git a/third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h b/third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h
index e7bb437d461c5ab623343f1090d5cc9fa7e52aba..d8d92ec568275f15892044b244bd242fd3b2f72a 100644
--- a/third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h
+++ b/third_party/WebKit/Source/core/layout/MultiColumnFragmentainerGroup.h
@@ -72,6 +72,12 @@ public:
     void collectLayerFragments(PaintLayerFragments&, const LayoutRect& layerBoundingBox, const LayoutRect& dirtyRect) const;
     LayoutRect calculateOverflow() const;
 
+    enum ColumnIndexCalculationMode {
+        ClampToExistingColumns, // Stay within the range of already existing columns.
+        AssumeNewColumns // Allow column indices outside the range of already existing columns.
+    };
+    unsigned columnIndexAtOffset(LayoutUnit offsetInFlowThread, ColumnIndexCalculationMode = ClampToExistingColumns) const;
+
     // The "CSS actual" value of column-count. This includes overflowing columns, if any.
     unsigned actualColumnCount() const;
 
@@ -87,12 +93,6 @@ private:
     LayoutRect flowThreadPortionRectAt(unsigned columnIndex) const;
     LayoutRect flowThreadPortionOverflowRectAt(unsigned columnIndex) const;
 
-    enum ColumnIndexCalculationMode {
-        ClampToExistingColumns, // Stay within the range of already existing columns.
-        AssumeNewColumns // Allow column indices outside the range of already existing columns.
-    };
-    unsigned columnIndexAtOffset(LayoutUnit offsetInFlowThread, ColumnIndexCalculationMode = ClampToExistingColumns) const;
-
     // Return the column that the specified visual point belongs to. Only the coordinate on the
     // column progression axis is relevant. Every point belongs to a column, even if said point is
     // not inside any of the columns.