DevTools: report adding mutation event listener as a violations.

third_party/WebKit/Source/devtools/front_end/console/ConsoleViewMessage.js

 /*
  * Copyright (C) 2011 Google Inc.  All rights reserved.
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 875 matching lines @@
     if (this._messageLevelIcon)
       contentElement.appendChild(this._messageLevelIcon);
     this._contentElement = contentElement;
     if (this._message.type === ConsoleModel.ConsoleMessage.MessageType.StartGroup ||
         this._message.type === ConsoleModel.ConsoleMessage.MessageType.StartGroupCollapsed)
       contentElement.classList.add('console-group-title');
 
     var formattedMessage;
     var shouldIncludeTrace = !!this._message.stackTrace &&
         (this._message.source === ConsoleModel.ConsoleMessage.MessageSource.Network ||
+         this._message.source === ConsoleModel.ConsoleMessage.MessageSource.Violation ||
          this._message.level === ConsoleModel.ConsoleMessage.MessageLevel.Error ||
-         this._message.type === ConsoleModel.ConsoleMessage.MessageType.Trace ||
-         this._message.level === ConsoleModel.ConsoleMessage.MessageLevel.Warning);
+         this._message.level === ConsoleModel.ConsoleMessage.MessageLevel.Warning ||
+         this._message.type === ConsoleModel.ConsoleMessage.MessageType.Trace);
     if (this._message.runtimeModel() && shouldIncludeTrace)
       formattedMessage = this._buildMessageWithStackTrace();
     else if (this._message.type === ConsoleModel.ConsoleMessage.MessageType.Table)
       formattedMessage = this._buildTableMessage();
     else
       formattedMessage = this._buildMessage();
     contentElement.appendChild(formattedMessage);
 
     this.updateTimestamp();
     return this._contentElement;
@@ skipping 306 matching lines @@
   toMessageElement() {
     if (!this._element) {
       super.toMessageElement();
       this._expandGroupIcon = UI.Icon.create('', 'expand-group-icon');
       this._contentElement.insertBefore(this._expandGroupIcon, this._contentElement.firstChild);
       this.setCollapsed(this._collapsed);
     }
     return this._element;
   }
 };