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

ui/native_theme/native_theme_base.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_NATIVE_THEME_NATIVE_THEME_BASE_H_
 #define UI_NATIVE_THEME_NATIVE_THEME_BASE_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 90 matching lines @@
 
   virtual void PaintMenuPopupBackground(
       SkCanvas* canvas,
       const gfx::Size& size,
       const MenuBackgroundExtraParams& menu_background) const;
 
   virtual void PaintMenuItemBackground(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
-      const MenuListExtraParams& menu_list) const;
+      const MenuItemExtraParams& menu_item) const;

[varkha, 2016/02/06 00:51:21]

This seems to be a typo as seen by a call site here:
https://code.google.com/p/chromium/codesearch#chromium/src/ui/views/controls/...

 
   virtual void PaintSliderTrack(
       SkCanvas* canvas,
       State state,
       const gfx::Rect& rect,
       const SliderExtraParams& slider) const;
 
   virtual void PaintSliderThumb(
       SkCanvas* canvas,
       State state,
@@ skipping 86 matching lines @@
 
   // The length of the arrow buttons, 0 means no buttons are drawn.
   unsigned int scrollbar_button_length_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeThemeBase);
 };
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_NATIVE_THEME_BASE_H_