Uses and returns the fractional width in text eliding

ui/views/widget/tooltip_manager.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_H_
 #define UI_VIEWS_WIDGET_TOOLTIP_MANAGER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 35 matching lines @@
   // Invoked when the tooltip text changes for the specified views.
   virtual void TooltipTextChanged(View* view) = 0;
 
  protected:
   // Trims the tooltip to fit, setting |text| to the clipped result,
   // |max_width| to the width (in pixels) of the clipped text and |line_count|
   // to the number of lines of text in the tooltip. |x| and |y| give the
   // location of the tooltip in screen coordinates. |context| is used to
   // determine which gfx::Screen should be used.
   static void TrimTooltipToFit(string16* text,
-                               int* max_width,
+                               float* max_width,
                                int* line_count,
                                int x,
                                int y,
                                gfx::NativeView context);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_TOOLTIP_MANAGER_H_