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

ui/native_theme/native_theme_aura.cc

Index: ui/native_theme/native_theme_aura.cc
diff --git a/ui/native_theme/native_theme_aura.cc b/ui/native_theme/native_theme_aura.cc
index 6382593f3e63d8752143d4a6c46efb3c3d263115..eb0d02ea4841fcd65b8b0fd38da3985268309820 100644
--- a/ui/native_theme/native_theme_aura.cc
+++ b/ui/native_theme/native_theme_aura.cc
@@ -9,10 +9,12 @@
 #include "ui/base/layout.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/image/image_skia.h"
+#include "ui/gfx/path.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 #include "ui/gfx/skbitmap_operations.h"
 #include "ui/native_theme/common_theme.h"
+#include "ui/views/round_rect_painter.h"
 
 namespace {
 
@@ -195,7 +197,15 @@ SkColor NativeThemeAura::GetSystemColor(ColorId color_id) const {
 
 void NativeThemeAura::PaintMenuPopupBackground(SkCanvas* canvas,
                                                const gfx::Size& size) const {
-  canvas->drawColor(kMenuBackgroundColor, SkXfermode::kSrc_Mode);
+  SkPaint paint;
+  paint.setStyle(SkPaint::kFill_Style);
+  paint.setFlags(SkPaint::kAntiAlias_Flag);
+  paint.setColor(kMenuBackgroundColor);
+
+  gfx::Path path;
+  views::RoundRectPainter::CreateRoundRectPath(gfx::Rect(size), &path);
+
+  canvas->drawPath(path, paint);
 }
 
 void NativeThemeAura::PaintScrollbarTrack(