Implement CSS: scroll-boundary-behavior

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 0388e82893ce7bc95d89f316808ad042d0169381..f5aed377757f0a70300f892eafaa22d6b6198e51 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp
@@ -2463,6 +2463,23 @@ bool CSSPropertyParser::ConsumeBorder(bool important) {
   return range_.AtEnd();
 }
 
+bool CSSPropertyParser::Consume2Values(const StylePropertyShorthand& shorthand,
+                                       bool important) {
+  DCHECK_EQ(shorthand.length(), 2u);
+  const CSSPropertyID* longhands = shorthand.properties();
+  const CSSValue* start = ParseSingleValue(longhands[0], shorthand.id());
+  if (!start)
+    return false;
+
+  const CSSValue* end = ParseSingleValue(longhands[1], shorthand.id());
+  if (!end)
+    end = start;
+  AddProperty(longhands[0], shorthand.id(), *start, important);
+  AddProperty(longhands[1], shorthand.id(), *end, important);
+
+  return range_.AtEnd();
+}
+
 bool CSSPropertyParser::Consume4Values(const StylePropertyShorthand& shorthand,
                                        bool important) {
   DCHECK_EQ(shorthand.length(), 4u);
@@ -3430,6 +3447,8 @@ bool CSSPropertyParser::ParseShorthand(CSSPropertyID unresolved_property,
       return ConsumePlaceItemsShorthand(important);
     case CSSPropertyPlaceSelf:
       return ConsumePlaceSelfShorthand(important);
+    case CSSPropertyScrollBoundaryBehavior:
+      return Consume2Values(scrollBoundaryBehaviorShorthand(), important);
     default:
       return false;
   }