Add a new GetSystemColor method to native theme.

ui/gfx/native_theme_win.cc

 // Copyright (c) 2011 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/gfx/native_theme_win.h"
 
 #include <windows.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
 #include <vssym32.h>
@@ skipping 37 matching lines @@
                                                   SkShader::kRepeat_TileMode);
 
   // Align the pattern with the upper corner of |align_rect|.
   SkMatrix matrix;
   matrix.setTranslate(SkIntToScalar(align_rect.left),
                       SkIntToScalar(align_rect.top));
   shader->setLocalMatrix(matrix);
   SkSafeUnref(paint->setShader(shader));
 }
 
+SkColor WinColorToSkColor(COLORREF color) {
+  return SkColorSetRGB(GetRValue(color), GetGValue(color), GetBValue(color));
+}
+
 }  // namespace
 
 namespace gfx {
 
 // static
 const NativeTheme* NativeTheme::instance() {
   return NativeThemeWin::instance();
 }
 
 // static
@@ skipping 1607 matching lines @@
           break;
       }
       break;
     default:
       NOTREACHED() << "Invalid part: " << part;
       break;
   }
   return state_id;
 }
 
+SkColor NativeThemeWin::GetSystemColor(ColorId color_id) const {
+  switch (color_id) {
+    case kDialogBackgroundColor:
+      // TODO(benrg): Should this use the new Windows theme functions? The old
+      // code in DialogClientView::OnPaint used GetSysColor(COLOR_3DFACE).
+      return WinColorToSkColor(GetSysColor(COLOR_3DFACE));
+    default:
+      NOTREACHED() << "Invalid color_id: " << color_id;
+      break;
+  }
+  return SkColorSetRGB(255, 0, 0);  // warning red
+}
+
 }  // namespace gfx