Add CSS parser support for break-after, break-before and break-inside.

third_party/WebKit/Source/core/style/ComputedStyleConstants.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 303 matching lines @@
 enum TextAlignLast {
     TextAlignLastAuto, TextAlignLastStart, TextAlignLastEnd, TextAlignLastLeft, TextAlignLastRight, TextAlignLastCenter, TextAlignLastJustify
 };
 
 enum TextUnderlinePosition {
     // FIXME: Implement support for 'under left' and 'under right' values.
     TextUnderlinePositionAuto,
     TextUnderlinePositionUnder
 };
 
-enum EPageBreak {
-    PBAUTO, PBALWAYS, PBAVOID
+enum EBreak {
+    BreakAuto,
+    BreakAvoid,
+    BreakAvoidColumn,
+    BreakAvoidPage,
+    // Values below are only allowed for break-after and break-before. Values above are also
+    // allowed for break-inside (in addition to break-after and break-before).
+    BreakValueLastAllowedForBreakInside = BreakAvoidPage,
+    BreakColumn,
+    BreakLeft,
+    BreakPage,
+    BreakRecto,
+    BreakRight,
+    BreakVerso,
+    BreakValueLastAllowedForBreakAfterAndBefore = BreakVerso,
+    BreakAlways // Only needed by {page,-webkit-column}-break-{after,before} shorthands.
 };
 
 enum EEmptyCell {
     SHOW, HIDE
 };
 
 enum ECaptionSide {
     CAPTOP, CAPBOTTOM, CAPLEFT, CAPRIGHT
 };
 
@@ skipping 218 matching lines @@
 
 enum ScrollSnapType {
     ScrollSnapTypeNone,
     ScrollSnapTypeMandatory,
     ScrollSnapTypeProximity
 };
 
 } // namespace blink
 
 #endif // ComputedStyleConstants_h