DevTools: use recordEnumeratedHistogram instead of recordActionTaken

Source/devtools/front_end/host/UserMetrics.js

Index: Source/devtools/front_end/host/UserMetrics.js
diff --git a/Source/devtools/front_end/host/UserMetrics.js b/Source/devtools/front_end/host/UserMetrics.js
index 3c1215456fc1e93d66690ba2d6cc4ab68097f3d7..b0ab53e6fa4f106f0d9dfb65b419f52967a3bac8 100644
--- a/Source/devtools/front_end/host/UserMetrics.js
+++ b/Source/devtools/front_end/host/UserMetrics.js
@@ -86,9 +86,14 @@ WebInspector.UserMetrics.UserActionNames = {
 };
 
 WebInspector.UserMetrics.prototype = {
+    /**
+     * @param {string} panelName
+     */
     panelShown: function(panelName)
     {
-        InspectorFrontendHost.recordPanelShown(WebInspector.UserMetrics._PanelCodes[panelName] || 0);
+        var code = WebInspector.UserMetrics._PanelCodes[panelName] || 0;
+        var size = Object.keys(WebInspector.UserMetrics._PanelCodes).length + 1;
+        InspectorFrontendHost.recordEnumeratedHistogram("DevTools.PanelShown", code, size);
     }
 }
 
@@ -103,7 +108,8 @@ WebInspector.UserMetrics._Recorder = function(actionCode)
 WebInspector.UserMetrics._Recorder.prototype = {
     record: function()
     {
-        InspectorFrontendHost.recordActionTaken(this._actionCode);
+        var size = Object.keys(WebInspector.UserMetrics._ActionCodes).length + 1;
+        InspectorFrontendHost.recordEnumeratedHistogram("DevTools.ActionTaken", this._actionCode, size);
     }
 }