Native themes: Add menu separator part

ui/native_theme/native_theme_win.h

Index: ui/native_theme/native_theme_win.h
diff --git a/ui/native_theme/native_theme_win.h b/ui/native_theme/native_theme_win.h
index 52b2aebb13ad19ce4b1ed8b90a3ad2e5fac1b8b4..78f11a13c78fe90eb072c6781180ff917c940400 100644
--- a/ui/native_theme/native_theme_win.h
+++ b/ui/native_theme/native_theme_win.h
@@ -128,7 +128,9 @@ class NATIVE_THEME_EXPORT NativeThemeWin : public NativeTheme,
   void UpdateSystemColors();
 
   // Painting functions that paint to SkCanvas.
-  void PaintMenuSeparator(SkCanvas* canvas, const gfx::Rect& rect) const;
+  void PaintMenuSeparator(SkCanvas* canvas,
+                          const gfx::Rect& rect,
+                          const MenuSeparatorExtraParams& extra) const;

[Tom (Use chromium acct), 2017/01/25 22:25:44]

sky: Do you think I should get rid of the extra args I added here and just pass
in extra.paint_rect as rect?

[sky, 2017/01/25 22:40:10]

Yes, I think that would be less confusing.

[Tom (Use chromium acct), 2017/01/25 22:49:43]

Done.

   void PaintMenuGutter(SkCanvas* canvas, const gfx::Rect& rect) const;
   void PaintMenuBackground(SkCanvas* canvas, const gfx::Rect& rect) const;
 
@@ -165,7 +167,8 @@ class NATIVE_THEME_EXPORT NativeThemeWin : public NativeTheme,
                       RECT* rect) const;
 
   HRESULT PaintMenuSeparator(HDC hdc,
-                             const gfx::Rect& rect) const;
+                             const gfx::Rect& rect,
+                             const MenuSeparatorExtraParams& extra) const;
 
   HRESULT PaintMenuGutter(HDC hdc, const gfx::Rect& rect) const;