Support float widths in RenderTextHarfBuzz.

ui/gfx/render_text.h

 // Copyright (c) 2012 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_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <algorithm>
 #include <cstring>
 #include <string>
@@ skipping 145 matching lines @@
 };
 
 // A line of layout text, comprised of a line segment list and some metrics.
 struct Line {
   Line();
   ~Line();
 
   // Segments that make up this line in visual order.
   std::vector<LineSegment> segments;
 
-  // A line size is the sum of segment widths and the maximum of segment
-  // heights.
-  Size size;
+  // The sum of segment widths and the maximum of segment heights.
+  SizeF size;
 
   // Sum of preceding lines' heights.
   int preceding_heights;
 
   // Maximum baseline of all segments on this line.
   int baseline;
 };
 
 // Creates an SkTypeface from a font |family| name and a |gfx::Font::FontStyle|.
 // May return NULL.
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   // Lines computed by EnsureLayout. These should be invalidated with
   // ResetLayout and on |display_rect_| changes.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_