DevTools: track more elements panel user actions

third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js

Index: third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js
diff --git a/third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js b/third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js
index adc793d4f02e12b9679c73c0585e5405dfa534c7..110cf2fdb7b3dfd02459dc489aadf65eb2db4778 100644
--- a/third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js
+++ b/third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js
@@ -74,6 +74,7 @@ Elements.ElementsTreeOutline = class extends UI.TreeOutline {
     this._selectedDOMNode = null;
 
     this._visible = false;
+    this._shouldReportSelectedNodeChangedUMA = false;
 
     this._popoverHelper = new UI.PopoverHelper(this._element);
     this._popoverHelper.initializeCallbacks(this._getPopoverAnchor.bind(this), this._showPopover.bind(this));
@@ -394,6 +395,11 @@ Elements.ElementsTreeOutline = class extends UI.TreeOutline {
    * @param {boolean} focus
    */
   _selectedNodeChanged(focus) {
+    // Don't want to track first time selecting node because user may
+    // just be trying to open DevTools with "Inspect"
+    if (this._shouldReportSelectedNodeChangedUMA)
+      Host.userMetrics.actionTaken(Host.UserMetrics.Action.ChangeInspectedNodeInElementsPanel);
+    this._shouldReportSelectedNodeChangedUMA = true;
     this.dispatchEventToListeners(
         Elements.ElementsTreeOutline.Events.SelectedNodeChanged, {node: this._selectedDOMNode, focus: focus});
   }