DevTools: Treat system object distances with less priority

Source/devtools/front_end/HeapSnapshotGridNodes.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 166 matching lines @@
     },
 
     /**
      * @override
      */
     wasDetached: function()
     {
         this._dataGrid.nodeWasDetached(this);
     },
 
+    /**
+     * @param {number} num
+     * @return {string}
+     */
     _toPercentString: function(num)
     {
         return num.toFixed(0) + "\u2009%"; // \u2009 is a thin space.
     },
 
     /**
+     * @param {number} distance
+     * @return {string}
+     */
+    _toUIDistance: function(distance)
+    {
+        var baseSystemDistance = WebInspector.HeapSnapshotCommon.baseSystemDistance;
+        return distance >= 0 && distance < baseSystemDistance ? WebInspector.UIString("%d", distance) : WebInspector.UIString("\u2212");
+    },
+
+    /**
      * @return {!Array.<!WebInspector.DataGridNode>}
      */
     allChildren: function()
     {
         return this._dataGrid.allChildren(this);
     },
 
     /**
      * @param {number} index
      */
@@ skipping 296 matching lines @@
         this._reachableFromWindow = true;
     } else if (node.canBeQueried)
         this._reachableFromWindow = true;
     if (node.detachedDOMTreeNode)
         this.detachedDOMTreeNode = true;
 
     var snapshot = dataGrid.snapshot;
     var shallowSizePercent = this._shallowSize / snapshot.totalSize * 100.0;
     var retainedSizePercent = this._retainedSize / snapshot.totalSize * 100.0;
     this.data = {
-        "distance": this._distance,
+        "distance": this._toUIDistance(this._distance),
         "shallowSize": Number.withThousandsSeparator(this._shallowSize),
         "retainedSize": Number.withThousandsSeparator(this._retainedSize),
         "shallowSize-percent": this._toPercentString(shallowSizePercent),
         "retainedSize-percent": this._toPercentString(retainedSizePercent)
     };
 };
 
 WebInspector.HeapSnapshotGenericObjectNode.prototype = {
     /**
      * @return {?{snapshot:!WebInspector.HeapSnapshotProxy, snapshotNodeIndex:number}}
@@ skipping 378 matching lines @@
     this._shallowSize = aggregate.self;
     this._retainedSize = aggregate.maxRet;
 
     var snapshot = dataGrid.snapshot;
     var countPercent = this._count / snapshot.nodeCount * 100.0;
     var retainedSizePercent = this._retainedSize / snapshot.totalSize * 100.0;
     var shallowSizePercent = this._shallowSize / snapshot.totalSize * 100.0;
 
     this.data = {
         "object": className,
-        "count":  Number.withThousandsSeparator(this._count),
-        "distance":  this._distance,
+        "count": Number.withThousandsSeparator(this._count),
+        "distance": this._toUIDistance(this._distance),
         "shallowSize": Number.withThousandsSeparator(this._shallowSize),
         "retainedSize": Number.withThousandsSeparator(this._retainedSize),
-        "count-percent":  this._toPercentString(countPercent),
+        "count-percent": this._toPercentString(countPercent),
         "shallowSize-percent": this._toPercentString(shallowSizePercent),
         "retainedSize-percent": this._toPercentString(retainedSizePercent)
     };
 }
 
 WebInspector.HeapSnapshotConstructorNode.prototype = {
     /**
      * @override
      * @return {!WebInspector.HeapSnapshotProviderProxy}
      */
@@ skipping 517 matching lines @@
     /**
      * @return {number}
      */
     allocationNodeId: function()
     {
         return this.data.id;
     },
 
     __proto__: WebInspector.HeapSnapshotGridNode.prototype
 }