Native themes: Add menu separator part

ui/views/controls/menu/menu_separator_win.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/menu/menu_separator.h"
-
-#include <windows.h>
-#include <uxtheme.h>
-#include <Vssym32.h>
-
-#include "ui/display/win/dpi.h"
-#include "ui/gfx/canvas.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/native_theme/native_theme.h"
-#include "ui/native_theme/native_theme_aura.h"
-#include "ui/views/controls/menu/menu_item_view.h"
-
-namespace views {
-
-void MenuSeparator::OnPaint(gfx::Canvas* canvas) {
-  ui::NativeTheme* native_theme = GetNativeTheme();
-  gfx::Rect separator_bounds = GetPaintBounds();
-
-  // Hack to get the separator to display correctly on Windows where we may
-  // have fractional scales. We move the separator 1 pixel down to ensure that
-  // it falls within the clipping rect which is scaled up.
-  float device_scale = display::win::GetDPIScale();
-  bool is_fractional_scale =
-      (device_scale - static_cast<int>(device_scale) != 0);
-  if (is_fractional_scale && separator_bounds.y() == 0)
-    separator_bounds.set_y(1);
-
-  ui::NativeTheme::ExtraParams extra;
-  native_theme->Paint(
-      canvas->sk_canvas(), ui::NativeTheme::kMenuPopupSeparator,
-      ui::NativeTheme::kNormal, separator_bounds, extra);
-}
-
-}  // namespace views