Support slotchange event

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

 /*
  * Copyright (C) 2012 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 12 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/dom/shadow/ElementShadow.h"
 
 #include "core/css/StyleSheetList.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/NodeTraversal.h"
 #include "core/dom/StyleChangeReason.h"
+#include "core/dom/StyleEngine.h"
 #include "core/dom/shadow/DistributedNodes.h"
 #include "core/frame/Deprecation.h"
 #include "core/html/HTMLContentElement.h"
 #include "core/html/HTMLShadowElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/ScriptForbiddenScope.h"
 
 namespace blink {
 
@@ skipping 120 matching lines @@
     }
 
     for (ShadowRoot* root = m_shadowRoots.head(); root; root = root->olderShadowRoot())
         root->lazyReattachIfAttached();
 
     ShadowRoot* shadowRoot = ShadowRoot::create(shadowHost.document(), type);
     shadowRoot->setParentOrShadowHostNode(&shadowHost);
     shadowRoot->setParentTreeScope(shadowHost.treeScope());
     m_shadowRoots.push(shadowRoot);
     setNeedsDistributionRecalc();
+    if (shadowHost.document().shadowCascadeOrder() == ShadowCascadeOrder::ShadowCascadeV1)
+        shadowHost.document().updateAssignment();
 
     shadowRoot->insertedInto(&shadowHost);
     shadowHost.setChildNeedsStyleRecalc();
     shadowHost.setNeedsStyleRecalc(SubtreeStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::Shadow));
 
     InspectorInstrumentation::didPushShadowRoot(&shadowHost, shadowRoot);
 
     return *shadowRoot;
 }
 
@@ skipping 158 matching lines @@
 }
 
 void ElementShadow::willAffectSelector()
 {
     for (ElementShadow* shadow = this; shadow; shadow = shadow->containingShadow()) {
         if (shadow->needsSelectFeatureSet())
             break;
         shadow->setNeedsSelectFeatureSet();
     }
     setNeedsDistributionRecalc();
+    if (host()->document().shadowCascadeOrder() == ShadowCascadeOrder::ShadowCascadeV1)
+        host()->document().updateAssignment();
 }
 
 void ElementShadow::clearDistribution()
 {
     m_nodeToInsertionPoints.clear();
 
     for (ShadowRoot* root = &youngestShadowRoot(); root; root = root->olderShadowRoot())
         root->setShadowInsertionPointOfYoungerShadowRoot(nullptr);
 }
 
 DEFINE_TRACE(ElementShadow)
 {
     visitor->trace(m_nodeToInsertionPoints);
     visitor->trace(m_selectFeatures);
     // Shadow roots are linked with previous and next pointers which are traced.
     // It is therefore enough to trace one of the shadow roots here and the
     // rest will be traced from there.
     visitor->trace(m_shadowRoots.head());
 }
 
 } // namespace blink