Prepare to enable RenderTextHarfBuzz by default

ui/gfx/render_text_harfbuzz.h

 // Copyright 2014 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_HARFBUZZ_H_
 #define UI_GFX_RENDER_TEXT_HARFBUZZ_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "third_party/harfbuzz-ng/src/hb.h"
@@ skipping 52 matching lines @@
 
 class GFX_EXPORT RenderTextHarfBuzz : public RenderText {
  public:
   RenderTextHarfBuzz();
   virtual ~RenderTextHarfBuzz();
 
   // Overridden from RenderText.
   virtual Size GetStringSize() OVERRIDE;
   virtual SelectionModel FindCursorPosition(const Point& point) OVERRIDE;
   virtual std::vector<FontSpan> GetFontSpansForTesting() OVERRIDE;
+  virtual Range GetGlyphBounds(size_t index) OVERRIDE;
 
  protected:
   // Overridden from RenderText.
   virtual int GetLayoutTextBaseline() OVERRIDE;
   virtual SelectionModel AdjacentCharSelectionModel(
       const SelectionModel& selection,
       VisualCursorDirection direction) OVERRIDE;
   virtual SelectionModel AdjacentWordSelectionModel(
       const SelectionModel& selection,
       VisualCursorDirection direction) OVERRIDE;
-  virtual Range GetGlyphBounds(size_t index) OVERRIDE;
   virtual std::vector<Rect> GetSubstringBounds(const Range& range) OVERRIDE;
   virtual size_t TextIndexToLayoutIndex(size_t index) const OVERRIDE;
   virtual size_t LayoutIndexToTextIndex(size_t index) const OVERRIDE;
   virtual bool IsValidCursorIndex(size_t index) OVERRIDE;
   virtual void ResetLayout() OVERRIDE;
   virtual void EnsureLayout() OVERRIDE;
   virtual void DrawVisualText(Canvas* canvas) OVERRIDE;
 
  private:
   friend class RenderTextTest;
@@ skipping 29 matching lines @@
   std::vector<int32_t> logical_to_visual_;
 
   bool needs_layout_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_HARFBUZZ_H_