[WIP] Refactor DocumentMarker

third_party/WebKit/Source/core/editing/markers/TextMatchMarkerList.cpp

 // Copyright 2017 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/editing/markers/TextMatchMarkerList.h"
 
 #include "core/editing/markers/DocumentMarkerController.h"
 
 namespace blink {
 
@@ skipping 33 matching lines @@
     textMatchMarker->invalidate();
   }
 }
 
 bool TextMatchMarkerList::setTextMatchMarkersActive(unsigned startOffset,
                                                     unsigned endOffset,
                                                     bool active) {
   bool docDirty = false;
   for (auto it = getPosOfFirstMarkerNotEndingBefore(startOffset);
        it != m_markers.end(); ++it) {
-    DocumentMarker& marker = **it;
+    TextMatchMarker& marker = toTextMatchMarker(**it);
     // Markers are stored in order, so stop if we are now past the specified
     // range.
     if (marker.startOffset() >= endOffset)
       break;
 
     marker.setActiveMatch(active);
     docDirty = true;
   }
 
   return docDirty;
 }
 
 bool TextMatchMarkerList::markerListIsSorted() const {
   return true;
 }
 
 DEFINE_TRACE(TextMatchMarkerList) {
   visitor->trace(m_markers);
   DocumentMarkerList::trace(visitor);
 }
 
 }  // namespace blink