<!--  As an open source project with a dedicated but small maintainer team, it can sometimes take a long time for issues to be addressed so please be patient and we will get back to you as soon as we can.
-->

### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for a feature request that matches the one I want to file, without success.

### Problem Description
I need a way of checking if the user is in https://i.imgur.com/yvZYfsG.png
Windows Dark mode or light mode

### Proposed Solution
systemPreferences.getShellColorType()

### Alternatives Considered
n/a

### Additional Information
Because my app icon is white, I want it to invert if using the Windows 10 light mode.
https://i.imgur.com/dzsLQTs.png
You can barely see it in light mode.

shell/browser/api/atom_api_system_preferences.cc
v8::Isolate* isolate) {
  return mate::CreateHandle(isolate, new SystemPreferences(isolate));
}
void SystemPreferences::BuildPrototype(
    v8::Isolate* isolate,
    v8::Local<v8::FunctionTemplate> prototype) {
  prototype->SetClassName(mate::StringToV8(isolate, "SystemPreferences"));
  mate::ObjectTemplateBuilder(isolate, prototype->PrototypeTemplate())
#if defined(OS_WIN) || defined(OS_MACOSX)
      .SetMethod("getColor", &SystemPreferences::GetColor)
      .SetMethod("getAccentColor", &SystemPreferences::GetAccentColor)
#endif
#if defined(OS_WIN)
      .SetMethod("isAeroGlassEnabled", &SystemPreferences::IsAeroGlassEnabled)
#elif defined(OS_MACOSX)
      .SetMethod("postNotification", &SystemPreferences::PostNotification)
      .SetMethod("subscribeNotification",
                 &SystemPreferences::SubscribeNotification)
      .SetMethod("unsubscribeNotification",
                 &SystemPreferences::UnsubscribeNotification)
      .SetMethod("postLocalNotification",
                 &SystemPreferences::PostLocalNotification)