Implement CSS: scroll-boundary-behavior

third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h

Index: third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
diff --git a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
index ef50851e579e859a84e8da399bba326ddd370bbd..e60197113b81d733fb58007bd48b82031d48adf9 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
@@ -3213,6 +3213,39 @@ inline ScrollBehavior CSSIdentifierValue::ConvertTo() const {
 }
 
 template <>
+inline CSSIdentifierValue::CSSIdentifierValue(
+    EScrollBoundaryBehavior boundary_behavior)
+    : CSSValue(kIdentifierClass) {
+  switch (boundary_behavior) {
+    case EScrollBoundaryBehavior::kAuto:
+      value_id_ = CSSValueAuto;
+      break;
+    case EScrollBoundaryBehavior::kContain:
+      value_id_ = CSSValueContain;
+      break;
+    case EScrollBoundaryBehavior::kNone:
+      value_id_ = CSSValueNone;
+      break;
+  }
+}
+
+template <>
+inline EScrollBoundaryBehavior CSSIdentifierValue::ConvertTo() const {
+  switch (GetValueID()) {
+    case CSSValueAuto:
+      return EScrollBoundaryBehavior::kAuto;
+    case CSSValueContain:
+      return EScrollBoundaryBehavior::kContain;
+    case CSSValueNone:
+      return EScrollBoundaryBehavior::kNone;
+    default:
+      break;
+  }
+  NOTREACHED();
+  return EScrollBoundaryBehavior::kAuto;
+}
+
+template <>
 inline CSSIdentifierValue::CSSIdentifierValue(ScrollSnapType snap_type)
     : CSSValue(kIdentifierClass) {
   switch (snap_type) {