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

third_party/WebKit/Source/core/style/ComputedStyleConstants.h

Index: third_party/WebKit/Source/core/style/ComputedStyleConstants.h
diff --git a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
index f2a99cd540fb84add62bf9823d71053f5d9659aa..461ce9f733ca11696971971d3a661687ab3e456d 100644
--- a/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
+++ b/third_party/WebKit/Source/core/style/ComputedStyleConstants.h
@@ -321,8 +321,24 @@ enum TextUnderlinePosition {
     TextUnderlinePositionUnder
 };
 
-enum EPageBreak {
-    PBAUTO, PBALWAYS, PBAVOID
+enum EBreak {
+    BreakAuto,
+    BreakAvoid,
+    BreakAvoidColumn,
+    BreakAvoidPage,
+    BreakAvoidRegion,
+    // 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 = BreakAvoidRegion,
+    BreakColumn,
+    BreakLeft,
+    BreakPage,
+    BreakRecto,
+    BreakRegion,
+    BreakRight,
+    BreakVerso,
+    BreakValueLastAllowedForBreakAfterAndBefore = BreakVerso,
+    BreakAlways // Only needed by {page,-webkit-column}-break-{after,before} shorthands.
 };
 
 enum EEmptyCell {