Uses and returns the fractional width in text eliding

ui/views/controls/combobox/combobox.cc

 // 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.
 
 #include "ui/views/controls/combobox/combobox.h"
 
+#include <cmath>
+
 #include "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/base/models/combobox_model.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/events/event.h"
 #include "ui/events/keycodes/keyboard_codes.h"
 #include "ui/gfx/canvas.h"
 #include "ui/native_theme/native_theme.h"
@@ skipping 310 matching lines @@
   state->value = model_->GetItemAt(selected_index_);
   state->index = selected_index_;
   state->count = model_->GetItemCount();
 }
 
 void Combobox::OnModelChanged() {
   ModelChanged();
 }
 
 void Combobox::UpdateFromModel() {
-  int max_width = 0;
+  float max_width = 0;
   const gfx::Font& font = Combobox::GetFont();
 
   MenuItemView* menu = new MenuItemView(this);
   // MenuRunner owns |menu|.
   dropdown_list_menu_runner_.reset(new MenuRunner(menu));
 
   int num_items = model()->GetItemCount();
   for (int i = 0; i < num_items; ++i) {
     if (model()->IsItemSeparatorAt(i)) {
       menu->AppendSeparator();
       continue;
     }
 
     string16 text = model()->GetItemAt(i);
 
     // Inserting the Unicode formatting characters if necessary so that the
     // text is displayed correctly in right-to-left UIs.
     base::i18n::AdjustStringForLocaleDirection(&text);
 
     menu->AppendMenuItem(i + kFirstMenuItemId, text, MenuItemView::NORMAL);
     max_width = std::max(max_width, font.GetStringWidth(text));
   }
 
-  content_size_.SetSize(max_width, font.GetHeight());
+  content_size_.SetSize(std::ceil(max_width), font.GetHeight());
 }
 
 void Combobox::AdjustBoundsForRTLUI(gfx::Rect* rect) const {
   rect->set_x(GetMirroredXForRect(*rect));
 }
 
 void Combobox::PaintText(gfx::Canvas* canvas) {
   gfx::Insets insets = GetInsets();
 
   canvas->Save();
@@ skipping 80 matching lines @@
 }
 
 void Combobox::OnSelectionChanged() {
   if (listener_)
     listener_->OnSelectedIndexChanged(this);
   NotifyAccessibilityEvent(ui::AccessibilityTypes::EVENT_VALUE_CHANGED, false);
   SchedulePaint();
 }
 
 }  // namespace views