Make classes and structures in core/layout fast-allocated.

Source/core/layout/PendingSelection.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  *
  */
 
 #ifndef PendingSelection_h
 #define PendingSelection_h
 
 #include "core/editing/Position.h"
 #include "core/editing/VisibleSelection.h"
+#include "platform/heap/Handle.h"
 
 namespace blink {
 
 class Document;
 class FrameSelection;
 
 class PendingSelection final : public NoBaseWillBeGarbageCollected<PendingSelection> {
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(PendingSelection);
 public:
     static PassOwnPtrWillBeRawPtr<PendingSelection> create()
     {
         return adoptPtrWillBeNoop(new PendingSelection);
     }
 
     bool hasPendingSelection() const { return m_hasPendingSelection; }
     void setSelection(const FrameSelection&);
     void clear();
 
@@ skipping 12 matching lines @@
     VisibleSelection calcVisibleSelectionAlgorithm() const;
 
     VisibleSelection m_selection;
     bool m_hasPendingSelection : 1;
     bool m_shouldShowBlockCursor : 1;
 };
 
 } // namespace blink
 
 #endif