[MarkersIntersectingRange #2.05] Add DocumentMarkerList::FirstMarkerIntersectingRange()

third_party/WebKit/Source/core/editing/markers/CompositionMarkerListImpl.h

 // 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.
 
 #ifndef CompositionMarkerListImpl_h
 #define CompositionMarkerListImpl_h
 
 #include "core/editing/markers/DocumentMarkerList.h"
 
 namespace blink {
@@ skipping 10 matching lines @@
 
   // DocumentMarkerList implementations
   DocumentMarker::MarkerType MarkerType() const final;
 
   bool IsEmpty() const final;
 
   void Add(DocumentMarker*) final;
   void Clear() final;
 
   const HeapVector<Member<DocumentMarker>>& GetMarkers() const final;
+  DocumentMarker* FirstMarkerIntersectingRange(unsigned start_offset,
+                                               unsigned end_offset) const final;
   HeapVector<Member<DocumentMarker>> MarkersIntersectingRange(
       unsigned start_offset,
       unsigned end_offset) const final;
 
   bool MoveMarkers(int length, DocumentMarkerList* dst_list) final;
   bool RemoveMarkers(unsigned start_offset, int length) final;
   bool ShiftMarkers(unsigned offset,
                     unsigned old_length,
                     unsigned new_length) final;
 
   DECLARE_VIRTUAL_TRACE();
 
  private:
   HeapVector<Member<DocumentMarker>> markers_;
 
   DISALLOW_COPY_AND_ASSIGN(CompositionMarkerListImpl);
 };
 
 }  // namespace blink
 
 #endif  // CompositionMarkerListImpl_h