Combine 2 exclusions in Layout Opportunity Tree if they shadow each other

third_party/WebKit/Source/core/layout/ng/ng_layout_opportunity_tree_node.cc

 // Copyright 2016 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/layout/ng/ng_layout_opportunity_tree_node.h"
 
 namespace blink {
 
 NGLayoutOpportunityTreeNode::NGLayoutOpportunityTreeNode(
     const NGLogicalRect opportunity)
-    : opportunity(opportunity), exclusion(nullptr) {
+    : opportunity(opportunity), combined_exclusion(nullptr) {
   exclusion_edge.start = opportunity.offset.inline_offset;
   exclusion_edge.end = exclusion_edge.start + opportunity.size.inline_size;
 }
 
 NGLayoutOpportunityTreeNode::NGLayoutOpportunityTreeNode(
     const NGLogicalRect opportunity,
     NGEdge exclusion_edge)
     : opportunity(opportunity),
       exclusion_edge(exclusion_edge),
-      exclusion(nullptr) {}
+      combined_exclusion(nullptr) {}
 
 String NGLayoutOpportunityTreeNode::ToString() const {
-  return String::format(
-      "Opportunity: '%s' Exclusion: '%s'",
-      opportunity.ToString().ascii().data(),
-      exclusion ? exclusion->ToString().ascii().data() : "null");
+  return String::format("Opportunity: '%s' Exclusion: '%s'",
+                        opportunity.ToString().ascii().data(),
+                        combined_exclusion
+                            ? combined_exclusion->ToString().ascii().data()
+                            : "null");
 }
 
 DEFINE_TRACE(NGLayoutOpportunityTreeNode) {
   visitor->trace(left);
   visitor->trace(bottom);
   visitor->trace(right);
 }
 
 }  // namespace blink