DevTools: Implement recursive viewport for the Heap Summary view

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 86 matching lines @@
      */
     collapse: function()
     {
         WebInspector.DataGridNode.prototype.collapse.call(this);
         this._dataGrid.updateVisibleNodes();
     },
 
     /**
      * @override
      */
+    expand: function()
+    {
+        WebInspector.DataGridNode.prototype.expand.call(this);
+        this._dataGrid.updateVisibleNodes();
+    },
+
+    /**
+     * @override
+     */
     dispose: function()
     {
         if (this._providerObject)
             this._providerObject.dispose();
         for (var node = this.children[0]; node; node = node.traverseNextNode(true, this, true))
             if (node.dispose)
                 node.dispose();
     },
 
     _reachableFromWindow: false,
@@ skipping 13 matching lines @@
     _toPercentString: function(num)
     {
         return num.toFixed(0) + "\u2009%"; // \u2009 is a thin space.
     },
 
     /**
      * @return {!Array.<!WebInspector.DataGridNode>}
      */
     allChildren: function()
     {
-        return this.children;
+        return this._dataGrid.allChildren(this);
     },
 
     /**
      * @param {number} index
      */
     removeChildByIndex: function(index)
     {
-        this.removeChild(this.children[index]);
+        this._dataGrid.removeChildByIndex(this, index);
     },
 
     /**
      * @param {number} nodePosition
      * @return {?WebInspector.DataGridNode}
      */
     childForPosition: function(nodePosition)
     {
         var indexOfFirstChildInRange = 0;
         for (var i = 0; i < this._retrievedChildrenRanges.length; i++) {
@@ skipping 81 matching lines @@
         }
 
         /**
          * @this {WebInspector.HeapSnapshotGridNode}
          */
         function insertRetrievedChild(item, insertionIndex)
         {
             if (this._savedChildren) {
                 var hash = this._childHashForEntity(item);
                 if (hash in this._savedChildren) {
-                    this.insertChild(this._savedChildren[hash], insertionIndex);
+                    this._dataGrid.insertChild(this, this._savedChildren[hash], insertionIndex);
                     return;
                 }
             }
-            this.insertChild(this._createChildNode(item), insertionIndex);
+            this._dataGrid.insertChild(this, this._createChildNode(item), insertionIndex);
         }
 
         /**
          * @this {WebInspector.HeapSnapshotGridNode}
          */
         function insertShowMoreButton(from, to, insertionIndex)
         {
             var button = new WebInspector.ShowMoreDataGridNode(this._populateChildren.bind(this), from, to, this._dataGrid.defaultPopulateCount());
-            this.insertChild(button, insertionIndex);
+            this._dataGrid.insertChild(this, button, insertionIndex);
         }
 
         /**
          * @param {!WebInspector.HeapSnapshotCommon.ItemsRange} itemsRange
          * @this {WebInspector.HeapSnapshotGridNode}
          */
         function childrenRetrieved(itemsRange)
         {
             var itemIndex = 0;
             var itemPosition = itemsRange.startPosition;
@@ skipping 75 matching lines @@
                 }
             }
 
             // TODO: fix this.
             this._instanceCount += items.length;
             if (firstNotSerializedPosition < toPosition) {
                 serializeNextChunk.call(this);
                 return;
             }
 
+            this._dataGrid.updateVisibleNodes();
             if (afterPopulate)
                 afterPopulate();
             this.dispatchEventToListeners(WebInspector.HeapSnapshotGridNode.Events.PopulateComplete);
         }
         serializeNextChunk.call(this);
     },
 
     _saveChildren: function()
     {
         this._savedChildren = null;
@@ skipping 11 matching lines @@
     sort: function()
     {
         this._dataGrid.recursiveSortingEnter();
 
         /**
          * @this {WebInspector.HeapSnapshotGridNode}
          */
         function afterSort()
         {
             this._saveChildren();
-            this.removeChildren();
+            this._dataGrid.removeAllChildren(this);
             this._retrievedChildrenRanges = [];
 
             /**
              * @this {WebInspector.HeapSnapshotGridNode}
              */
             function afterPopulate()
             {
                 var children = this.allChildren();
                 for (var i = 0, l = children.length; i < l; ++i) {
                     var child = children[i];
@@ skipping 859 matching lines @@
     },
 
     _emptyData: function()
     {
         return {};
     },
 
     __proto__: WebInspector.HeapSnapshotGenericObjectNode.prototype
 }