fix know issues in RenderText

ui/gfx/render_text_linux.h

 // Copyright (c) 2011 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 UI_GFX_RENDER_TEXT_LINUX_H_
 #define UI_GFX_RENDER_TEXT_LINUX_H_
 #pragma once
 
 #include <pango/pango.h>
 
@@ skipping 12 matching lines @@
   virtual void SetDisplayRect(const Rect&r) OVERRIDE;
   virtual void SetCompositionRange(const ui::Range& composition_range) OVERRIDE;
   virtual void ApplyStyleRange(StyleRange style_range) OVERRIDE;
   virtual void ApplyDefaultStyle() OVERRIDE;
   virtual base::i18n::TextDirection GetTextDirection() OVERRIDE;
   virtual int GetStringWidth() OVERRIDE;
   virtual void Draw(Canvas* canvas) OVERRIDE;
   virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
   virtual Rect GetCursorBounds(const SelectionModel& position,
                                bool insert_mode) OVERRIDE;
+  virtual size_t GetIndexOfNextGrapheme(size_t position) OVERRIDE;
+
 
  protected:
   // Overridden from RenderText:
   virtual SelectionModel GetLeftSelectionModel(const SelectionModel& current,
                                                BreakType break_type) OVERRIDE;
   virtual SelectionModel GetRightSelectionModel(const SelectionModel& current,
                                                 BreakType break_type) OVERRIDE;
   virtual SelectionModel LeftEndSelectionModel() OVERRIDE;
   virtual SelectionModel RightEndSelectionModel() OVERRIDE;
   virtual size_t GetIndexOfPreviousGrapheme(size_t position) OVERRIDE;
+  virtual bool IsCursorablePosition(size_t position) OVERRIDE;
 
  private:
   enum RelativeLogicalPosition {
     PREVIOUS,
     NEXT
   };
 
-  // Get the logical start index of the next grapheme after |position|.
-  size_t GetIndexOfNextGrapheme(size_t position);
-
   // Returns the run that contains |position|. Return NULL if not found.
   GSList* GetRunContainingPosition(size_t position) const;
 
   // Given |utf8_index_of_current_grapheme|, returns the UTF8 or UTF16 index of
   // next grapheme in the text if |pos| is NEXT, otherwise, returns the index of
   // previous grapheme. Returns 0 if there is no previous grapheme, and returns
   // the |text_| length if there is no next grapheme.
   size_t Utf8IndexOfAdjacentGrapheme(size_t utf8_index_of_current_grapheme,
                                      RelativeLogicalPosition pos) const;
   size_t Utf16IndexOfAdjacentGrapheme(size_t utf8_index_of_current_grapheme,
@@ skipping 52 matching lines @@
   const char* layout_text_;
   // The text length.
   size_t layout_text_len_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextLinux);
 };
 
 }  // namespace gfx;
 
 #endif  // UI_GFX_RENDER_TEXT_LINUX_H_