Add support for the column-fill property.

Source/core/rendering/style/RenderStyleConstants.h

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2003, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 72 matching lines @@
     // Internal IDs follow:
     SCROLLBAR_THUMB, SCROLLBAR_BUTTON, SCROLLBAR_TRACK, SCROLLBAR_TRACK_PIECE, SCROLLBAR_CORNER, RESIZER,
     INPUT_LIST_BUTTON,
     AFTER_LAST_INTERNAL_PSEUDOID,
     FULL_SCREEN, FULL_SCREEN_DOCUMENT, FULL_SCREEN_ANCESTOR,
     FIRST_PUBLIC_PSEUDOID = FIRST_LINE,
     FIRST_INTERNAL_PSEUDOID = SCROLLBAR_THUMB,
     PUBLIC_PSEUDOID_MASK = ((1 << FIRST_INTERNAL_PSEUDOID) - 1) & ~((1 << FIRST_PUBLIC_PSEUDOID) - 1)
 };
 
+enum ColumnFill { ColumnFillBalance, ColumnFillAuto };
+
 enum ColumnSpan { ColumnSpanNone = 0, ColumnSpanAll };
 
 enum EBorderCollapse { BSEPARATE = 0, BCOLLAPSE = 1 };
 
 // These have been defined in the order of their precedence for border-collapsing. Do
 // not change this order! This order also must match the order in CSSValueKeywords.in.
 enum EBorderStyle { BNONE, BHIDDEN, INSET, GROOVE, OUTSET, RIDGE, DOTTED, DASHED, SOLID, DOUBLE };
 
 enum EBorderPrecedence { BOFF, BTABLE, BCOLGROUP, BCOL, BROWGROUP, BROW, BCELL };
 
@@ skipping 411 matching lines @@
 enum EIsolation { IsolationAuto, IsolationIsolate };
 
 // Reasonable maximum to prevent insane font sizes from causing crashes on some platforms (such as Windows).
 static const float maximumAllowedFontSize = 1000000.0f;
 
 enum TextIndentLine { TextIndentFirstLine, TextIndentEachLine };
 
 } // namespace WebCore
 
 #endif // RenderStyleConstants_h