Uses and returns the fractional width in text eliding

ui/views/widget/tooltip_manager.cc

 // 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.
 
 #include "ui/views/widget/tooltip_manager.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/strings/string_split.h"
 #include "base/strings/utf_string_conversions.h"
 #include "ui/gfx/text_elider.h"
 #include "ui/gfx/text_utils.h"
 
 // Maximum number of characters we allow in a tooltip.
 const size_t kMaxTooltipLength = 1024;
 
 // Maximum number of lines we allow in the tooltip.
 const size_t kMaxLines = 6;
 
 namespace views {
 
 // static
 void TooltipManager::TrimTooltipToFit(string16* text,
-                                      int* max_width,
+                                      float* max_width,
                                       int* line_count,
                                       int x,
                                       int y,
                                       gfx::NativeView context) {
   *max_width = 0;
   *line_count = 0;
 
   // Clamp the tooltip length to kMaxTooltipLength so that we don't
   // accidentally DOS the user with a mega tooltip.
   if (text->length() > kMaxTooltipLength)
     *text = text->substr(0, kMaxTooltipLength);
 
   // Determine the available width for the tooltip.
   int available_width = GetMaxWidth(x, y, context);
 
   // Split the string into at most kMaxLines lines.
   std::vector<string16> lines;
   base::SplitString(*text, '\n', &lines);
   if (lines.size() > kMaxLines)
     lines.resize(kMaxLines);
   *line_count = static_cast<int>(lines.size());
 
   // Format each line to fit.
   const gfx::FontList& font_list = GetDefaultFontList();
   string16 result;
   for (std::vector<string16>::iterator i = lines.begin(); i != lines.end();
        ++i) {
     string16 elided_text =
         gfx::ElideText(*i, font_list, available_width, gfx::ELIDE_AT_END);
-    *max_width = std::max(*max_width,
-                          gfx::GetStringWidth(elided_text, font_list));
+    *max_width = std::max(
+        *max_width, gfx::GetStringWidth(elided_text, font_list));
     if (!result.empty())
       result.push_back('\n');
     result.append(elided_text);
   }
   *text = result;
 }
 
 }  // namespace views