DevTools: ignore weak referenced when calculating dominators for heap snapshot

Source/devtools/front_end/heap_snapshot_worker/HeapSnapshot.js

 /*
  * Copyright (C) 2011 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 1540 matching lines @@
     {
         var nodeFieldCount = this._nodeFieldCount;
         var nodes = this.nodes;
         var firstRetainerIndex = this._firstRetainerIndex;
         var retainingNodes = this._retainingNodes;
         var retainingEdges = this._retainingEdges;
         var edgeFieldsCount = this._edgeFieldsCount;
         var edgeTypeOffset = this._edgeTypeOffset;
         var edgeToNodeOffset = this._edgeToNodeOffset;
         var edgeShortcutType = this._edgeShortcutType;
+        var edgeWeakType = this._edgeWeakType;
         var firstEdgeIndexes = this._firstEdgeIndexes;
         var containmentEdges = this.containmentEdges;
         var containmentEdgesLength = this.containmentEdges.length;
         var rootNodeIndex = this._rootNodeIndex;
 
         var mapAndFlag = this.userObjectsMapAndFlag();
         var flags = mapAndFlag ? mapAndFlag.map : null;
         var flag = mapAndFlag ? mapAndFlag.flag : 0;
 
         var nodesCount = postOrderIndex2NodeOrdinal.length;
@@ skipping 33 matching lines @@
                 if (dominators[postOrderIndex] === rootPostOrderedIndex)
                     continue;
                 nodeOrdinal = postOrderIndex2NodeOrdinal[postOrderIndex];
                 var nodeFlag = !flags || (flags[nodeOrdinal] & flag);
                 var newDominatorIndex = noEntry;
                 var beginRetainerIndex = firstRetainerIndex[nodeOrdinal];
                 var endRetainerIndex = firstRetainerIndex[nodeOrdinal + 1];
                 for (var retainerIndex = beginRetainerIndex; retainerIndex < endRetainerIndex; ++retainerIndex) {
                     var retainerEdgeIndex = retainingEdges[retainerIndex];
                     var retainerEdgeType = containmentEdges[retainerEdgeIndex + edgeTypeOffset];
+                    if (retainerEdgeType === edgeWeakType)
+                        continue;
                     var retainerNodeIndex = retainingNodes[retainerIndex];
                     if (retainerNodeIndex !== rootNodeIndex && retainerEdgeType === edgeShortcutType)
                         continue;
                     var retainerNodeOrdinal = retainerNodeIndex / nodeFieldCount;
                     var retainerNodeFlag = !flags || (flags[retainerNodeOrdinal] & flag);
                     // We are skipping the edges from non-page-owned nodes to page-owned nodes.
                     // Otherwise the dominators for the objects that also were retained by debugger would be affected.
                     if (retainerNodeIndex !== rootNodeIndex && nodeFlag && !retainerNodeFlag)
                         continue;
                     var retanerPostOrderIndex = nodeOrdinal2PostOrderIndex[retainerNodeOrdinal];
@@ skipping 627 matching lines @@
      * @param {number} windowRight
      */
     sort: function(comparator, leftBound, rightBound, windowLeft, windowRight)
     {
         this._iterationOrder.sortRange(this._buildCompareFunction(comparator), leftBound, rightBound, windowLeft, windowRight);
     },
 
     __proto__: WebInspector.HeapSnapshotItemProvider.prototype
 }