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 aa30b74edac99a047ff1c1d1eb0896ab0d20f2e5..dd21adbf9739ceaac2209c226697d9ed38024715 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSParserFastPaths.cpp
@@ -845,6 +845,12 @@ bool CSSParserFastPaths::IsValidKeywordPropertyAndValue(
       DCHECK(RuntimeEnabledFeatures::cssScrollSnapPointsEnabled());
       return value_id == CSSValueNone || value_id == CSSValueMandatory ||
              value_id == CSSValueProximity;
+    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;
@@ -898,6 +904,8 @@ bool CSSParserFastPaths::IsKeywordPropertyID(CSSPropertyID property_id) {
     case CSSPropertyPosition:
     case CSSPropertyResize:
     case CSSPropertyScrollBehavior:
+    case CSSPropertyScrollBoundaryBehaviorX:
+    case CSSPropertyScrollBoundaryBehaviorY:
     case CSSPropertyShapeRendering:
     case CSSPropertySpeak:
     case CSSPropertyStrokeLinecap: