Uses and returns the fractional width in text eliding

ui/views/widget/tooltip_manager_win.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_VIEWS_WIDGET_TOOLTIP_MANAGER_WIN_H_
 #define UI_VIEWS_WIDGET_TOOLTIP_MANAGER_WIN_H_
 
 #include <windows.h>
 #include <commctrl.h>
 #include <string>
@@ skipping 108 matching lines @@
   // Text for tooltip from the view.
   string16 tooltip_text_;
 
   // The clipped tooltip.
   string16 clipped_text_;
 
   // Number of lines in the tooltip.
   int line_count_;
 
   // Width of the last tooltip.
-  int tooltip_width_;
+  float tooltip_width_;
 
   DISALLOW_COPY_AND_ASSIGN(TooltipManagerWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_TOOLTIP_MANAGER_WIN_H_