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 4ee0efa5336c873969ef9ea02bb9379dcb110afe..f9676ba54ac38613bf3777faeafde534be9440ea 100644
--- a/third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js
+++ b/third_party/WebKit/Source/devtools/front_end/elements/ElementsTreeOutline.js
@@ -73,6 +73,7 @@ Elements.ElementsTreeOutline = class extends UI.TreeOutline {
     this._selectedDOMNode = null;
 
     this._visible = false;
+    this._reportedNodeSelectedUMA = false;
 
     this._popoverHelper = new UI.PopoverHelper(this._element);
     this._popoverHelper.initializeCallbacks(this._getPopoverAnchor.bind(this), this._showPopover.bind(this));
@@ -393,6 +394,9 @@ Elements.ElementsTreeOutline = class extends UI.TreeOutline {
    * @param {boolean} focus
    */
   _selectedNodeChanged(focus) {
+    if (this._reportedNodeSelectedUMA)

[pfeldman, 2017/02/10 23:00:46]

!this._reportedNodeSelectedUMA

[chenwilliam, 2017/02/25 00:49:14]

I want to report it on the second time and afterwards, not the first time,
because the first time might be people using Inspect to open DevTools.

+      Host.userMetrics.actionTaken(Host.UserMetrics.Action.ElementsTreeOutlineSelectNode);
+    this._reportedNodeSelectedUMA = true;
     this.dispatchEventToListeners(
         Elements.ElementsTreeOutline.Events.SelectedNodeChanged, {node: this._selectedDOMNode, focus: focus});
   }