Add support for persisting CompositionUnderlines in InputMethodController

third_party/WebKit/Source/core/editing/CompositionUnderline.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 22 matching lines @@
 namespace blink {
 
 class CORE_EXPORT CompositionUnderline {
   DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
  public:
   CompositionUnderline(unsigned startOffset,
                        unsigned endOffset,
                        const Color&,
                        bool thick,
-                       const Color& backgroundColor);
+                       const Color& backgroundColor,
+                       bool persist);
 
   unsigned startOffset() const { return m_startOffset; }
   unsigned endOffset() const { return m_endOffset; }
   const Color& color() const { return m_color; }
   bool thick() const { return m_thick; }
   const Color& backgroundColor() const { return m_backgroundColor; }
+  bool persist() const { return m_persist; }
 
  private:
   unsigned m_startOffset;
   unsigned m_endOffset;
   Color m_color;
   bool m_thick;
   Color m_backgroundColor;
+  bool m_persist;
 };
 
 }  // namespace blink
 
 #endif  // CompositionUnderline_h