Implements CSSPropertyAPI for the fragmentation element properties.

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
index b7f9ff35f4908017e3d23f8088c71c577b408ee0..8bdd99efc9b4a19c1d47ccfb918752f246b00b73 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -3271,7 +3271,6 @@ const CSSValue* CSSPropertyParser::parseSingleValue(
       return consumeNumber(m_range, ValueRangeAll);
     case CSSPropertyWebkitBoxOrdinalGroup:
     case CSSPropertyOrphans:
-    case CSSPropertyWidows:

[nainar, 2017/01/18 23:56:30]

As per IRL conversation grouping together properties widows, orphans and
webkit-box-ordinal-group. 

       return consumePositiveInteger(m_range);
     case CSSPropertyWebkitTextStrokeWidth:
       return consumeTextStrokeWidth(m_range, m_context->mode());