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

ui/native_theme/native_theme_base.cc

 // 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.
 
 #include "ui/native_theme/native_theme_base.h"
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 158 matching lines @@
       break;
     case kMenuList:
       PaintMenuList(canvas, state, rect, extra.menu_list);
       break;
     case kMenuCheck:
     case kMenuCheckBackground:
     case kMenuPopupArrow:
       NOTIMPLEMENTED();
       break;
     case kMenuPopupBackground:
-      PaintMenuPopupBackground(canvas, rect.size());
+      PaintMenuPopupBackground(canvas, rect.size(), extra.menu_background);
       break;
     case kMenuPopupGutter:
     case kMenuPopupSeparator:
       NOTIMPLEMENTED();
       break;
     case kMenuItemBackground:
       PaintMenuItemBackground(canvas, state, rect, extra.menu_list);
       break;
     case kProgressBar:
       PaintProgressBar(canvas, state, rect, extra.progress_bar);
@@ skipping 670 matching lines @@
   paint.setStyle(SkPaint::kFill_Style);
 
   SkPath path;
   path.moveTo(menu_list.arrow_x, menu_list.arrow_y - 3);
   path.rLineTo(6, 0);
   path.rLineTo(-3, 6);
   path.close();
   canvas->drawPath(path, paint);
 }
 
-void NativeThemeBase::PaintMenuPopupBackground(SkCanvas* canvas,
-                                               const gfx::Size& size) const {
+void NativeThemeBase::PaintMenuPopupBackground(
+    SkCanvas* canvas,
+    const gfx::Size& size,
+    const MenuBackgroundExtraParams& menu_background) const {
   canvas->drawColor(kMenuPopupBackgroundColor, SkXfermode::kSrc_Mode);
 }
 
 void NativeThemeBase::PaintMenuItemBackground(
     SkCanvas* canvas,
     State state,
     const gfx::Rect& rect,
     const MenuListExtraParams& menu_list) const {
   // By default don't draw anything over the normal background.
 }
@@ skipping 248 matching lines @@
   SkScalar min_diff = Clamp((hsv1[1] + hsv2[1]) * 1.2f, 0.28f, 0.5f);
   SkScalar diff = Clamp(fabs(hsv1[2] - hsv2[2]) / 2, min_diff, 0.5f);
 
   if (hsv1[2] + hsv2[2] > 1.0)
     diff = -diff;
 
   return SaturateAndBrighten(hsv2, -0.2f, diff);
 }
 
 }  // namespace ui