Set distribution recalc flag when a slot assignment changes

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/dom/shadow/SlotAssignment.h"
 
 #include "core/HTMLNames.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeTraversal.h"
+#include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/html/HTMLSlotElement.h"
 
 namespace blink {
 
 HTMLSlotElement* SlotAssignment::assignedSlotFor(const Node& node) const
 {
     return m_assignment.get(const_cast<Node*>(&node));
 }
@@ skipping 59 matching lines @@
 
 void SlotAssignment::assign(Node& hostChild, HTMLSlotElement& slot)
 {
     ASSERT(hostChild.isSlotAssignable());
     m_assignment.add(&hostChild, &slot);
     slot.appendAssignedNode(hostChild);
     if (isHTMLSlotElement(hostChild))
         slot.appendDistributedNodesFrom(toHTMLSlotElement(hostChild));
     else
         slot.appendDistributedNode(hostChild);
+    if (slot.isChildOfV1ShadowHost())
+        slot.parentElementShadow()->setNeedsDistributionRecalc();
 }
 
 DEFINE_TRACE(SlotAssignment)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_assignment);
 #endif
 }
 
 } // namespace blink