Dispatch slotchange events in "notify mutation observers" steps

third_party/WebKit/Source/core/html/HTMLSlotElement.h

Index: third_party/WebKit/Source/core/html/HTMLSlotElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLSlotElement.h b/third_party/WebKit/Source/core/html/HTMLSlotElement.h
index f5f4aca971065f949a42a752caea190cf9271f10..642562d9bd0c397708b12255cd74be1ea56563bd 100644
--- a/third_party/WebKit/Source/core/html/HTMLSlotElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLSlotElement.h
@@ -96,6 +96,8 @@ class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
 
   bool supportsDistribution() const { return isInV1ShadowTree(); }
   void didSlotChange(SlotChangeType);
+  void dispatchSlotChangeEvent();
+  void clearSlotChangeEventEnqueued() { m_slotchangeEventEnqueued = false; }
 
   static AtomicString normalizeSlotName(const AtomicString&);
 
@@ -109,7 +111,6 @@ class CORE_EXPORT HTMLSlotElement final : public HTMLElement {
   void willRecalcStyle(StyleRecalcChange) final;
 
   void enqueueSlotChangeEvent();
-  void dispatchSlotChangeEvent();
 
   HeapVector<Member<Node>> m_assignedNodes;
   HeapVector<Member<Node>> m_distributedNodes;