Invert the dialog background color for Windows high contrast.

ui/native_theme/native_theme_win.cc

Index: ui/native_theme/native_theme_win.cc
diff --git a/ui/native_theme/native_theme_win.cc b/ui/native_theme/native_theme_win.cc
index e0ff0f10173dbd2d71b72ae954d51e5e8eae3eb9..381d8074552281e98b3ea4668786c0a1ad5e6f99 100644
--- a/ui/native_theme/native_theme_win.cc
+++ b/ui/native_theme/native_theme_win.cc
@@ -28,6 +28,7 @@
 #include "ui/gfx/gdi_util.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/rect_conversions.h"
+#include "ui/gfx/sys_color_change_listener.h"
 #include "ui/native_theme/common_theme.h"
 
 // This was removed from Winvers.h but is still used.
@@ -499,6 +500,8 @@ SkColor NativeThemeWin::GetSystemColor(ColorId color_id) const {
 
     // Dialogs
     case kColorId_DialogBackground:
+      if (gfx::IsInvertedColorScheme())
+        return color_utils::InvertColor(kDialogBackgroundColor);
       return kDialogBackgroundColor;
 
     // FocusableBorder