Add a fast-path for independent inherited properties

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 259 matching lines @@
     if (root && root->isV1() && root == insertionPoint->treeScope().rootNode()) {
         // This slot was in a shadow tree and got disconnected from the shadow root.
         root->ensureSlotAssignment().slotRemoved(*this);
     }
 
     HTMLElement::removedFrom(insertionPoint);
 }
 
 void HTMLSlotElement::willRecalcStyle(StyleRecalcChange change)
 {
-    if (change < Inherit && getStyleChangeType() < SubtreeStyleChange)
+    if (change < IndependentInherit && getStyleChangeType() < SubtreeStyleChange)
         return;
 
     for (auto& node : m_distributedNodes)
         node->setNeedsStyleRecalc(LocalStyleChange, StyleChangeReasonForTracing::create(StyleChangeReason::PropagateInheritChangeToDistributedNodes));
 }
 
 void HTMLSlotElement::updateDistributedNodesWithFallback()
 {
     if (!m_distributedNodes.isEmpty())
         return;
@@ skipping 65 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