Support float widths in RenderTextHarfBuzz.

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 30 matching lines @@
   // Writes the character and glyph ranges of the cluster containing |pos|.
   void GetClusterAt(size_t pos, Range* chars, Range* glyphs) const;
 
   // Returns the grapheme bounds at |text_index|. Handles multi-grapheme glyphs.
   Range GetGraphemeBounds(base::i18n::BreakIterator* grapheme_iterator,
                           size_t text_index);
 
   // Returns whether the given shaped run contains any missing glyphs.
   bool HasMissingGlyphs() const;
 
-  int width;
-  int preceding_run_widths;
+  float width;
+  float preceding_run_widths;
   Range range;
   bool is_rtl;
   UBiDiLevel level;
   UScriptCode script;
 
   scoped_ptr<uint16[]> glyphs;
   scoped_ptr<SkPoint[]> positions;
   std::vector<uint32> glyph_to_char;
   size_t glyph_count;
 
@@ skipping 10 matching lines @@
 
 }  // namespace internal
 
 class GFX_EXPORT RenderTextHarfBuzz : public RenderText {
  public:
   RenderTextHarfBuzz();
   virtual ~RenderTextHarfBuzz();
 
   // Overridden from RenderText.
   virtual Size GetStringSize() OVERRIDE;
+  virtual SizeF GetStringSizeF() 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;
@@ skipping 49 matching lines @@
   // ICU grapheme iterator for the layout text. Valid when |!needs_layout_|. Can
   // be NULL in case of an error.
   scoped_ptr<base::i18n::BreakIterator> grapheme_iterator_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderTextHarfBuzz);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_HARFBUZZ_H_