Uses and returns the fractional width in text eliding

ui/gfx/canvas.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_CANVAS_H_
 #define UI_GFX_CANVAS_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 121 matching lines @@
                             int line_height,
                             int flags);
   // Obsolete version.  Use the above version which takes FontList.
   static void SizeStringInt(const base::string16& text,
                             const Font& font,
                             int* width,
                             int* height,
                             int line_height,
                             int flags);
 
+  // This is same as SizeStringInt except that fractional size is returned.

[sky, 2013/10/08 02:12:56]

Please add a comment here and any public API you're adding about when and why
someone would want the float methods. Feel free to document this once (maybe
Font is the right place) and see look at XXX for when you would use this.

[jianli, 2013/10/08 18:29:48]

Added comment in Canvas::GetStringWidthF. We do not make any new addition to
Font class any more.

+  static void SizeStringFloat(const base::string16& text,
+                              const FontList& font_list,
+                              float* width,
+                              float* height,
+                              int line_height,
+                              int flags);
+
   // Returns the number of horizontal pixels needed to display the specified
   // |text| with |font_list|.
   static int GetStringWidth(const base::string16& text,
                             const FontList& font_list);
   // Obsolete version.  Use the above version which takes FontList.
   static int GetStringWidth(const base::string16& text, const Font& font);
 
+  // This is same as GetStringWidth except that fractional width is returned.
+  static float GetStringWidthF(const base::string16& text,
+                               const FontList& font_list);
+
   // Returns the default text alignment to be used when drawing text on a
   // Canvas based on the directionality of the system locale language.
   // This function is used by Canvas::DrawStringInt when the text alignment
   // is not specified.
   //
   // This function returns either Canvas::TEXT_ALIGN_LEFT or
   // Canvas::TEXT_ALIGN_RIGHT.
   static int DefaultCanvasTextAlignment();
 
   // Draws text with a 1-pixel halo around it of the given color.
@@ skipping 319 matching lines @@
 
   skia::RefPtr<skia::PlatformCanvas> owned_canvas_;
   SkCanvas* canvas_;
 
   DISALLOW_COPY_AND_ASSIGN(Canvas);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_CANVAS_H_