[DevTools] Show distribution for Shadow DOM V1.

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 22 matching lines @@
 #include "bindings/core/v8/Microtask.h"
 #include "core/HTMLNames.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/ElementShadow.h"
 #include "core/dom/shadow/InsertionPoint.h"
 #include "core/dom/shadow/SlotAssignment.h"
 #include "core/events/Event.h"
 #include "core/html/AssignedNodesOptions.h"
+#include "core/inspector/InspectorInstrumentation.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 inline HTMLSlotElement::HTMLSlotElement(Document& document)
     : HTMLElement(slotTag, document)
 {
     setHasCustomStyleCallbacks();
 }
@@ skipping 246 matching lines @@
 }
 
 void HTMLSlotElement::lazyReattachDistributedNodesIfNeeded()
 {
     // TODO(hayato): Figure out an exact condition where reattach is required
     if (m_oldDistributedNodes != m_distributedNodes) {
         for (auto& node : m_oldDistributedNodes)
             node->lazyReattachIfAttached();
         for (auto& node : m_distributedNodes)
             node->lazyReattachIfAttached();
+        InspectorInstrumentation::didPerformSlotDistribution(this);
     }
     m_oldDistributedNodes.clear();
 }
 
 void HTMLSlotElement::enqueueSlotChangeEvent()
 {
     if (!m_slotchangeEventEnqueued) {
         Microtask::enqueueMicrotask(WTF::bind(&HTMLSlotElement::dispatchSlotChangeEvent, wrapPersistent(this)));
         m_slotchangeEventEnqueued = true;
     }
@@ skipping 34 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