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

Source/core/editing/PlainTextRange.h

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef PlainTextRange_h
 #define PlainTextRange_h
 
 #include "core/CoreExport.h"
 #include "core/editing/EphemeralRange.h"
 #include "platform/heap/Handle.h"
+#include "wtf/Allocator.h"
 #include "wtf/NotFound.h"
 #include "wtf/PassRefPtr.h"
 
 namespace blink {
 
 class ContainerNode;
 class Range;
 
 class CORE_EXPORT PlainTextRange {
+    STACK_ALLOCATED();
 public:
     PlainTextRange();
     PlainTextRange(const PlainTextRange&);
     explicit PlainTextRange(int location);
     PlainTextRange(int start, int end);
 
     size_t end() const { ASSERT(!isNull()); return m_end; }
     size_t start() const { ASSERT(!isNull()); return m_start; }
     bool isNull() const { return m_start == kNotFound; }
     bool isNotNull() const { return m_start != kNotFound; }
@@ skipping 11 matching lines @@
     enum GetRangeFor { ForGeneric, ForSelection };
     EphemeralRange createRangeFor(const ContainerNode& scope, GetRangeFor) const;
 
     const size_t m_start;
     const size_t m_end;
 };
 
 } // namespace blink
 
 #endif // PlainTextRange_h