Introduce Element::AttributeModificationParams

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

 /*
  * Copyright (C) 2015 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 181 matching lines @@
 }
 
 void HTMLSlotElement::detachLayoutTree(const AttachContext& context) {
   if (supportsDistribution()) {
     for (auto& node : m_distributedNodes)
       node->lazyReattachIfAttached();
   }
   HTMLElement::detachLayoutTree(context);
 }
 
-void HTMLSlotElement::attributeChanged(const QualifiedName& name,
-                                       const AtomicString& oldValue,
-                                       const AtomicString& newValue,
-                                       AttributeModificationReason reason) {
-  if (name == nameAttr) {
+void HTMLSlotElement::attributeChanged(
+    const AttributeModificationParams& params) {
+  if (params.name == nameAttr) {
     if (ShadowRoot* root = containingShadowRoot()) {
-      if (root->isV1() && oldValue != newValue)
-        root->ensureSlotAssignment().slotRenamed(normalizeSlotName(oldValue),
-                                                 *this);
+      if (root->isV1() && params.oldValue != params.newValue) {
+        root->ensureSlotAssignment().slotRenamed(
+            normalizeSlotName(params.oldValue), *this);
+      }
     }
   }
-  HTMLElement::attributeChanged(name, oldValue, newValue, reason);
+  HTMLElement::attributeChanged(params);
 }
 
 static bool wasInShadowTreeBeforeInserted(HTMLSlotElement& slot,
                                           ContainerNode& insertionPoint) {
   ShadowRoot* root1 = slot.containingShadowRoot();
   ShadowRoot* root2 = insertionPoint.containingShadowRoot();
   if (root1 && root2 && root1 == root2)
     return false;
   return root1;
 }
@@ skipping 137 matching lines @@
 
 DEFINE_TRACE(HTMLSlotElement) {
   visitor->trace(m_assignedNodes);
   visitor->trace(m_distributedNodes);
   visitor->trace(m_oldDistributedNodes);
   visitor->trace(m_distributedIndices);
   HTMLElement::trace(visitor);
 }
 
 }  // namespace blink