Stop re-signaling a slotchange event

third_party/WebKit/Source/core/dom/Node.h

Index: third_party/WebKit/Source/core/dom/Node.h
diff --git a/third_party/WebKit/Source/core/dom/Node.h b/third_party/WebKit/Source/core/dom/Node.h
index d058ecf64fd38205cc828e79db15d31a5971b5ff..3ebc0c23f2d0cf164b825aee8cf8a67205bc7612 100644
--- a/third_party/WebKit/Source/core/dom/Node.h
+++ b/third_party/WebKit/Source/core/dom/Node.h
@@ -112,6 +112,11 @@ enum class CustomElementState {
   NotDefinedFlag = 2 << nodeCustomElementShift,
 };
 
+enum class SlotChangeType {
+  Initial,
+  Chained,
+};

[kochi, 2016/10/31 08:39:13]

nit: clang-format seems to prefer fitting in one line,
enum class SlotChangeType { Initial, Chained };
but if presubmit check didn't complain this, I think this is okay.
(also for the trailing comma for |Chained|).

+
 class NodeRareDataBase {
  public:
   LayoutObject* layoutObject() const { return m_layoutObject; }
@@ -774,9 +779,13 @@ class CORE_EXPORT Node : public EventTarget {
     return getFlag(IsFinishedParsingChildrenFlag);
   }
 
-  void checkSlotChange();
-  void checkSlotChangeAfterInserted() { checkSlotChange(); }
-  void checkSlotChangeBeforeRemoved() { checkSlotChange(); }
+  void checkSlotChange(SlotChangeType);
+  void checkSlotChangeAfterInserted() {
+    checkSlotChange(SlotChangeType::Initial);
+  }
+  void checkSlotChangeBeforeRemoved() {
+    checkSlotChange(SlotChangeType::Initial);
+  }
 
   DECLARE_VIRTUAL_TRACE();