Enables hot-tracking for overflow extension buttons in the app menu

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

 // Copyright (c) 2013 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 "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_menu_subclasses.h"
@@ skipping 181 matching lines @@
   } else {
     canvas->drawColor(GetSystemColor(kColorId_MenuBackgroundColor),
                       SkXfermode::kSrc_Mode);
   }
 }
 
 void NativeThemeGtk2::PaintMenuItemBackground(
     SkCanvas* canvas,
     State state,
     const gfx::Rect& rect,
-    const MenuListExtraParams& menu_list) const {
+    const MenuItemExtraParams& menu_item) const {
   SkColor color;
   SkPaint paint;
   switch (state) {
     case NativeTheme::kNormal:
     case NativeTheme::kDisabled:
       color = GetSystemColor(NativeTheme::kColorId_MenuBackgroundColor);
       paint.setColor(color);
       break;
     case NativeTheme::kHovered:
       color = GetSystemColor(
           NativeTheme::kColorId_FocusedMenuItemBackgroundColor);
       paint.setColor(color);
       break;
     default:
       NOTREACHED() << "Invalid state " << state;
       break;
   }
+  if (menu_item.corner_radius > 0) {
+    canvas->drawRoundRect(gfx::RectToSkRect(rect),
+                          SkIntToScalar(menu_item.corner_radius),
+                          SkIntToScalar(menu_item.corner_radius), paint);
+    return;
+  }
   canvas->drawRect(gfx::RectToSkRect(rect), paint);
 }
 
 SkColor NativeThemeGtk2::GetSystemColor(ColorId color_id) const {
   const SkColor kPositiveTextColor = SkColorSetRGB(0x0b, 0x80, 0x43);
   const SkColor kNegativeTextColor = SkColorSetRGB(0xc5, 0x39, 0x29);
 
   switch (color_id) {
     // Windows
     case kColorId_WindowBackground:
@@ skipping 338 matching lines @@
 
   if (!fake_menu_item) {
     fake_menu_item = gtk_custom_menu_item_new();
     gtk_menu_shell_append(GTK_MENU_SHELL(GetMenu()), fake_menu_item);
   }
 
   return fake_menu_item;
 }
 
 }  // namespace libgtk2ui