Plumbs through support for painting the scrollbarcorner

ui/native_theme/native_theme_aurawin.cc

 // Copyright 2014 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_aurawin.h"
 
 #include "grit/ui_resources.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/base/nine_image_painter_factory.h"
 #include "ui/base/resource/resource_bundle.h"
@@ skipping 138 matching lines @@
   gfx::Rect thumb_rect(rect);
   if (part == NativeTheme::kScrollbarVerticalThumb)
     thumb_rect.Inset(3, 0, 1, 0);
   else
     thumb_rect.Inset(0, 3, 0, 1);
   PaintPainter(GetOrCreatePainter(
                    kScrollbarThumbImages, state, scrollbar_thumb_painters_),
                sk_canvas, thumb_rect);
 }
 
+void NativeThemeAuraWin::PaintScrollbarCorner(SkCanvas* canvas,
+                                              State state,
+                                              const gfx::Rect& rect) const {
+  canvas->drawColor(SkColorSetRGB(0xF1, 0xF1, 0xF1), SkXfermode::kSrc_Mode);
+}
+
 NineImagePainter* NativeThemeAuraWin::GetOrCreatePainter(
     const int images[kMaxState][9],
     State state,
     scoped_ptr<NineImagePainter> painters[kMaxState]) const {
   if (painters[state])
     return painters[state].get();
   if (images[state][0] == 0) {
     // Must always provide normal state images.
     DCHECK_NE(kNormal, state);
     return GetOrCreatePainter(images, kNormal, painters);
   }
   painters[state] = CreateNineImagePainter(images[state]);
   return painters[state].get();
 }
 
 void NativeThemeAuraWin::PaintPainter(NineImagePainter* painter,
                                       SkCanvas* sk_canvas,
                                       const gfx::Rect& rect) const {
   DCHECK(painter);
   scoped_ptr<gfx::Canvas> canvas(CreateCanvas(sk_canvas));
   painter->Paint(canvas.get(), rect);
 }
 
 }  // namespace ui