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 f321bb24af66f8a861f48649926abc7759330898..817f346be5023338f6368f92e2014fc96b643d17 100644
--- a/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
+++ b/third_party/WebKit/Source/core/css/CSSPrimitiveValueMappings.h
@@ -3464,6 +3464,39 @@ inline ScrollBehavior CSSIdentifierValue::convertTo() const {
 }
 
 template <>
+inline CSSIdentifierValue::CSSIdentifierValue(
+    ScrollBoundaryBehavior boundaryBehavior)
+    : CSSValue(IdentifierClass) {
+  switch (boundaryBehavior) {
+    case ScrollBoundaryBehaviorPropagate:
+      m_valueID = CSSValuePropagate;
+      break;
+    case ScrollBoundaryBehaviorContain:
+      m_valueID = CSSValueContain;
+      break;
+    case ScrollBoundaryBehaviorNone:
+      m_valueID = CSSValueNone;
+      break;
+  }
+}
+
+template <>
+inline ScrollBoundaryBehavior CSSIdentifierValue::convertTo() const {
+  switch (getValueID()) {
+    case CSSValuePropagate:
+      return ScrollBoundaryBehaviorPropagate;
+    case CSSValueContain:
+      return ScrollBoundaryBehaviorContain;
+    case CSSValueNone:
+      return ScrollBoundaryBehaviorNone;
+    default:
+      break;
+  }
+  NOT_REACHED();
+  return ScrollBoundaryBehaviorPropagate;
+}
+
+template <>
 inline CSSIdentifierValue::CSSIdentifierValue(ScrollSnapType snapType)
     : CSSValue(IdentifierClass) {
   switch (snapType) {