Skip child ShadowRoots when invalidation does not have boundary crossing rules

Source/core/css/invalidation/StyleInvalidator.cpp

 
 // Copyright 2014 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 "config.h"
 
 #include "core/css/invalidation/StyleInvalidator.h"
 
 #include "core/css/invalidation/DescendantInvalidationSet.h"
@@ skipping 53 matching lines @@
 {
 }
 
 StyleInvalidator::~StyleInvalidator()
 {
 }
 
 void StyleInvalidator::RecursionData::pushInvalidationSet(const DescendantInvalidationSet& invalidationSet)
 {
     ASSERT(!m_wholeSubtreeInvalid);
+    if (invalidationSet.treeBoundaryCrossing())
+        m_treeBoundaryCrossing = true;
     if (invalidationSet.wholeSubtreeInvalid()) {
         m_wholeSubtreeInvalid = true;
         return;
     }
     m_invalidationSets.append(&invalidationSet);
     m_invalidateCustomPseudo = invalidationSet.customPseudoInvalid();
 }
 
 bool StyleInvalidator::RecursionData::matchesCurrentInvalidationSets(Element& element)
 {
@@ skipping 24 matching lines @@
             return true;
         }
     }
     return m_recursionData.matchesCurrentInvalidationSets(element);
 }
 
 bool StyleInvalidator::invalidateChildren(Element& element)
 {
     bool someChildrenNeedStyleRecalc = false;
     for (ShadowRoot* root = element.youngestShadowRoot(); root; root = root->olderShadowRoot()) {
-        for (Element* child = ElementTraversal::firstWithin(*root); child; child = ElementTraversal::nextSibling(*child)) {
+        if (!m_recursionData.treeBoundaryCrossing() && !root->childNeedsStyleInvalidation() && !root->needsStyleInvalidation())
+            continue;
+        for (Element* child = ElementTraversal::firstChild(*root); child; child = ElementTraversal::nextSibling(*child)) {
             bool childRecalced = invalidate(*child);
             someChildrenNeedStyleRecalc = someChildrenNeedStyleRecalc || childRecalced;
         }
         root->clearChildNeedsStyleInvalidation();
         root->clearNeedsStyleInvalidation();
     }
-    for (Element* child = ElementTraversal::firstWithin(element); child; child = ElementTraversal::nextSibling(*child)) {
+    for (Element* child = ElementTraversal::firstChild(element); child; child = ElementTraversal::nextSibling(*child)) {
         bool childRecalced = invalidate(*child);
         someChildrenNeedStyleRecalc = someChildrenNeedStyleRecalc || childRecalced;
     }
     return someChildrenNeedStyleRecalc;
 }
 
 bool StyleInvalidator::invalidate(Element& element)
 {
     RecursionCheckpoint checkpoint(&m_recursionData);
 
@@ skipping 18 matching lines @@
 
     return thisElementNeedsStyleRecalc;
 }
 
 void StyleInvalidator::trace(Visitor* visitor)
 {
     visitor->trace(m_pendingInvalidationMap);
 }
 
 } // namespace WebCore