[InputEvent] Support |sequence<Range> getRanges()| in 'beforeinput'

third_party/WebKit/Source/core/dom/Range.h

 /*
  * (C) 1999 Lars Knoll (knoll@kde.org)
  * (C) 2000 Gunnstein Lye (gunnstein@netcom.no)
  * (C) 2000 Frederik Holljen (frederik.holljen@hig.no)
  * (C) 2001 Peter Kelly (pmk@post.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 153 matching lines @@
     enum ContentsProcessDirection { ProcessContentsForward, ProcessContentsBackward };
     static Node* processAncestorsAndTheirSiblings(ActionType, Node* container, ContentsProcessDirection, Node* clonedContainer, Node* commonRoot, ExceptionState&);
 
     Member<Document> m_ownerDocument; // Cannot be null.
     RangeBoundaryPoint m_start;
     RangeBoundaryPoint m_end;
 };
 
 CORE_EXPORT bool areRangesEqual(const Range*, const Range*);
 
+using RangeVector = HeapVector<Member<Range>>;
+
 } // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showTree(const blink::Range*);
 #endif
 
 #endif // Range_h