DevTools: report adding mutation event listener as a violations.

third_party/WebKit/Source/core/events/EventUtil.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/events/EventUtil.h"
 
 #include "core/EventTypeNames.h"
 
 namespace blink {
 
 namespace EventUtil {
 
 bool IsPointerEventType(const AtomicString& event_type) {
   return event_type == EventTypeNames::gotpointercapture ||
          event_type == EventTypeNames::lostpointercapture ||
          event_type == EventTypeNames::pointercancel ||
          event_type == EventTypeNames::pointerdown ||
          event_type == EventTypeNames::pointerenter ||
          event_type == EventTypeNames::pointerleave ||
          event_type == EventTypeNames::pointermove ||
          event_type == EventTypeNames::pointerout ||
          event_type == EventTypeNames::pointerover ||
          event_type == EventTypeNames::pointerup;
 }
 
+bool IsDOMMutationEventType(const AtomicString& event_type) {
+  return event_type == EventTypeNames::DOMCharacterDataModified ||
+         event_type == EventTypeNames::DOMNodeInserted ||
+         event_type == EventTypeNames::DOMNodeInsertedIntoDocument ||
+         event_type == EventTypeNames::DOMNodeRemoved ||
+         event_type == EventTypeNames::DOMNodeRemovedFromDocument ||
+         event_type == EventTypeNames::DOMSubtreeModified;
+}
+
 }  // namespace eventUtil
 
 }  // namespace blink