Fix menu corners: the menu background was being painted as a rect when in fact,

ui/views/controls/menu/menu_config.h

 // 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.
 
 #ifndef UI_VIEWS_CONTROLS_MENU_MENU_CONFIG_H_
 #define UI_VIEWS_CONTROLS_MENU_MENU_CONFIG_H_
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/gfx/font.h"
 #include "ui/views/views_export.h"
@@ skipping 110 matching lines @@
 
   // True if the context menu's should be offset from the cursor position.
   bool offset_context_menus;
 
   const ui::NativeTheme* native_theme;
 
   // Delay, in ms, between when menus are selected or moused over and the menu
   // appears.
   int show_delay;
 
+  // Radius of the rounded corners of the menu border. Must be >= 0.
+  int corner_radius;
+
  private:
   // Configures a MenuConfig as appropriate for the current platform.
   void Init(const ui::NativeTheme* theme);
 
   // TODO: temporary until we standardize.
 #if defined(USE_AURA)
   void InitAura();
 #endif
 
   // Adjust some values for a new UI style.
   void AdjustForCommonTheme();
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_CONTROLS_MENU_MENU_CONFIG_H_