Implement CSS: scroll-boundary-behavior

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

Index: third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
index 4588ef58fbd4629f3e4d152cc7c083772c0a07af..8592cac84de6172a8e4edf50b5aef4e42b31b946 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
@@ -860,6 +860,12 @@ bool CSSParserFastPaths::IsValidKeywordPropertyAndValue(
     case CSSPropertyScrollSnapStop:
       DCHECK(RuntimeEnabledFeatures::CSSScrollSnapPointsEnabled());
       return value_id == CSSValueNormal || value_id == CSSValueAlways;
+    case CSSPropertyScrollBoundaryBehaviorX:
+      return value_id == CSSValueAuto || value_id == CSSValueContain ||
+             value_id == CSSValueNone;
+    case CSSPropertyScrollBoundaryBehaviorY:
+      return value_id == CSSValueAuto || value_id == CSSValueContain ||
+             value_id == CSSValueNone;
     default:
       NOTREACHED();
       return false;
@@ -913,6 +919,8 @@ bool CSSParserFastPaths::IsKeywordPropertyID(CSSPropertyID property_id) {
     case CSSPropertyPosition:
     case CSSPropertyResize:
     case CSSPropertyScrollBehavior:
+    case CSSPropertyScrollBoundaryBehaviorX:
+    case CSSPropertyScrollBoundaryBehaviorY:
     case CSSPropertyShapeRendering:
     case CSSPropertySpeak:
     case CSSPropertyStrokeLinecap: