[Devtools] Fix network grouping experiment

There was a regression recently that was fixed (https://codereview.chromium.org/2838673003/) but broke the network grouping experiment. This patch fixes that regression.

We were deeming the item as not needing to be removed or added without checking if there is a new parent.

R=dgozman,pfeldman
BUG=718116

Review-Url: https://codereview.chromium.org/2856863006
Cr-Commit-Position: refs/heads/master@{#469250}

third_party/WebKit/Source/devtools/front_end/network/NetworkLogView.js

@@ -843,10 +843,10 @@ Network.NetworkLogView = class extends UI.VBox {
       var request = node.request();
       this._timeCalculator.updateBoundaries(request);
       this._durationCalculator.updateBoundaries(request);
-      if (node[Network.NetworkLogView._isFilteredOutSymbol] === isFilteredOut)
+      var newParent = this._parentNodeForInsert(node);
+      if (node[Network.NetworkLogView._isFilteredOutSymbol] === isFilteredOut && node.parent === newParent)
         continue;
       node[Network.NetworkLogView._isFilteredOutSymbol] = isFilteredOut;
-      var newParent = this._parentNodeForInsert(node);
       var removeFromParent = node.parent && (isFilteredOut || node.parent !== newParent);
       if (removeFromParent) {
         var parent = node.parent;

third_party/WebKit/Source/devtools/front_end/network/NetworkPanel.js

@@ -195,6 +195,7 @@ Network.NetworkPanel = class extends UI.Panel {
     var setting = Common.settings.createSetting('networkGrouping', '');
     this._panelToolbar.appendToolbarItem(new UI.ToolbarSettingComboBox(options, setting, Common.UIString('Group by')));
     setting.addChangeListener(event => this._networkLogView.setGrouping(/** @type {string} */ (event.data)));
+    this._networkLogView.setGrouping(/** @type {string} */ (setting.get()));
   }
 
   /**