Add support for the column-fill property.

LayoutTests/fast/multicol/float-paginate-empty-lines.html

Index: LayoutTests/fast/multicol/float-paginate-empty-lines.html
diff --git a/LayoutTests/fast/multicol/float-paginate-empty-lines.html b/LayoutTests/fast/multicol/float-paginate-empty-lines.html
index 4f522c445457d343882a603c385c592c49761809..adeb331094e31b4dad559a5dbb46b9c9e3d802e2 100644
--- a/LayoutTests/fast/multicol/float-paginate-empty-lines.html
+++ b/LayoutTests/fast/multicol/float-paginate-empty-lines.html
@@ -1,11 +1,11 @@
 <p>This test is ensuring we don't grow the height of a block improperly when a float has no line association (e.g., when it's at the end of a
 block). The complete dashed border should be in the first column, with none of it appearing in the second column.</p>
 
-<div style="-webkit-column-width:300px;-moz-column-width:300px; height:400px">
+<div style="-moz-column-width:300px; -webkit-column-width:300px; column-width:300px; column-fill:auto; height:400px">
 <div style="border:10px dashed maroon">
 This is some text.<br>
 This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>
 This is some text.<br>This is some text.<br>This is some text.<br>This is some text.<br>
 This is some text.<br>
 <img style="float:right;width:100px;height:200px;background-color:#cccccc">
-</div>
+</div>