Improve RenderTextWin font fallback.

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 16 matching lines @@
                                bool insert_mode) 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 bool IsCursorablePosition(size_t position) OVERRIDE;
+  virtual bool IsCursorablePosition(size_t position, bool is_trailing) OVERRIDE;
   virtual void UpdateLayout() OVERRIDE;
 
  private:
   virtual size_t IndexOfAdjacentGrapheme(size_t index, bool next) OVERRIDE;
 
   // 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 |next| is true, otherwise, returns the index
@@ skipping 62 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_