Spec-compliant shorthand parsing of foo-break-(after,before,inside).

third_party/WebKit/Source/core/css/ComputedStyleCSSValueMapping.cpp

 /*
  * Copyright (C) 2004 Zack Rusin <zack@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2011 Sencha, Inc. All rights reserved.
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ skipping 1313 matching lines @@
 }
 
 static EBreak mapToPageBreakValue(EBreak genericBreakValue)
 {
     switch (genericBreakValue) {
     case BreakAvoidColumn:
     case BreakColumn:
     case BreakRecto:
     case BreakVerso:
         return BreakAuto;
-    case BreakLeft:
-    case BreakRight:
-        // TODO(mstensho): "left" and "right" should simply be mapped to that, not "always", according to spec.
     case BreakPage:
         return BreakAlways;
     case BreakAvoidPage:
         return BreakAvoid;
     default:
         return genericBreakValue;
     }
 }
 
 static EBreak mapToColumnBreakValue(EBreak genericBreakValue)
@@ skipping 1406 matching lines @@
     case CSSPropertyAll:
         return nullptr;
     default:
         break;
     }
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 } // namespace blink