Add support for the column-fill property.

LayoutTests/fast/multicol/pageLogicalOffset-vertical-expected.html

 <style>
     .container {
         background-color: lightblue;
         height: 200px;
         width: 100px;
         -webkit-columns: 2;
         -webkit-column-gap: 0;
+        columns: 2;
+        column-gap: 0;
+        column-fill: auto;
         margin: 8px;
     }
 
     .margin-before {
         width: 90px;
     }
 
     .test {
         font: 20px ahem;
         background-color: yellow;
     }
 </style>
 <div class="container" style="-webkit-writing-mode: vertical-rl;">
     <div>
         <div class="margin-before"></div>
         <div class="test">Test</div>
     </div>
 </div>
 
 <div class="container" style="-webkit-writing-mode: vertical-lr;">
     <div>
         <div class="margin-before"></div>
         <div class="test">Test</div>
     </div>
 </div>