Support slotchange event

third_party/WebKit/Source/core/dom/shadow/ShadowRoot.cpp

 /*
  * Copyright (C) 2011 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.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 108 matching lines @@
 
 void ShadowRoot::attach(const AttachContext& context)
 {
     StyleSharingDepthScope sharingScope(*this);
     DocumentFragment::attach(context);
 }
 
 Node::InsertionNotificationRequest ShadowRoot::insertedInto(ContainerNode* insertionPoint)
 {
     DocumentFragment::insertedInto(insertionPoint);
+    if (isV1())
+        document().updateAssignment();
 
     if (!insertionPoint->inShadowIncludingDocument() || !isOldest())
         return InsertionDone;
 
     // FIXME: When parsing <video controls>, insertedInto() is called many times without invoking removedFrom.
     // For now, we check m_registeredWithParentShadowroot. We would like to DCHECK(!m_registeredShadowRoot) here.
     // https://bugs.webkit.org/show_bug.cig?id=101316
     if (m_registeredWithParentShadowRoot)
         return InsertionDone;
 
     if (ShadowRoot* root = host()->containingShadowRoot()) {
         root->addChildShadowRoot();
         m_registeredWithParentShadowRoot = true;
     }
 
+
     return InsertionDone;
 }
 
 void ShadowRoot::removedFrom(ContainerNode* insertionPoint)
 {
     if (insertionPoint->inShadowIncludingDocument()) {
         document().styleEngine().shadowRootRemovedFromDocument(this);
         if (m_registeredWithParentShadowRoot) {
             ShadowRoot* root = host()->containingShadowRoot();
             if (!root)
                 root = insertionPoint->containingShadowRoot();
             if (root)
                 root->removeChildShadowRoot();
             m_registeredWithParentShadowRoot = false;
         }
     }
 
     DocumentFragment::removedFrom(insertionPoint);
 }
 
 void ShadowRoot::childrenChanged(const ChildrenChange& change)
 {
     ContainerNode::childrenChanged(change);
 
     if (change.isChildElementChange())
         checkForSiblingStyleChanges(change.type == ElementRemoved ? SiblingElementRemoved : SiblingElementInserted, change.siblingBeforeChange, change.siblingAfterChange);
 
     if (InsertionPoint* point = shadowInsertionPointOfYoungerShadowRoot()) {
-        if (ShadowRoot* root = point->containingShadowRoot())
+        if (ShadowRoot* root = point->containingShadowRoot()) {
             root->owner()->setNeedsDistributionRecalc();
+            if (document().shadowCascadeOrder() == ShadowCascadeOrder::ShadowCascadeV1)
+                document().updateAssignment();
+        }
     }
 }
 
 void ShadowRoot::registerScopedHTMLStyleChild()
 {
     ++m_numberOfStyles;
 }
 
 void ShadowRoot::unregisterScopedHTMLStyleChild()
 {
@@ skipping 143 matching lines @@
     DCHECK(m_shadowRootRareData);
     HeapVector<Member<HTMLSlotElement>> slots;
     slots.reserveCapacity(descendantSlotCount());
     for (HTMLSlotElement& slot : Traversal<HTMLSlotElement>::descendantsOf(rootNode()))
         slots.append(&slot);
     m_shadowRootRareData->setDescendantSlots(slots);
     m_descendantSlotsIsValid = true;
     return m_shadowRootRareData->descendantSlots();
 }
 
+void ShadowRoot::assignV1()
+{
+    if (!m_slotAssignment)
+        m_slotAssignment = SlotAssignment::create();
+    m_slotAssignment->resolveAssignment(*this);
+}
+
 void ShadowRoot::distributeV1()
 {
     if (!m_slotAssignment)
         m_slotAssignment = SlotAssignment::create();
-    m_slotAssignment->resolveAssignment(*this);
+    m_slotAssignment->resolveDistribution(*this);
 }
 
 DEFINE_TRACE(ShadowRoot)
 {
     visitor->trace(m_prev);
     visitor->trace(m_next);
     visitor->trace(m_shadowRootRareData);
     visitor->trace(m_slotAssignment);
     TreeScope::trace(visitor);
     DocumentFragment::trace(visitor);
 }
 
 } // namespace blink