* Electron version: 1.8.2
* Operating system: macos 10.13.3

Reproducing repo: https://github.com/ibash/electron-webkit-app-drag

Demonstrates a bug where `-webkit-app-region: drag` causes a browser view in front of it to miss click events. Oddly - it does not prevent hover events.

Steps:
1. Clone https://github.com/ibash/electron-webkit-app-drag, `yarn install`, `yarn start`
2. Click "button1"
3. Click "button2"

Expected:

Clicking button1 or button2 pops up an alert: "button clicked!"

Actual:

Only clicking button2 pops up an alert: "button clicked!"

atom/browser/api/atom_api_browser_window.cc
parent_window_.Reset(isolate, parent.ToV8());
  
  window_.reset(NativeWindow::Create(
      web_contents->managed_web_contents(),
      options,
      parent.IsEmpty() ? nullptr : parent->window_.get()));
  web_contents->SetOwnerWindow(window_.get());
  window_->set_is_offscreen_dummy(api_web_contents_->IsOffScreen());
  
  
  ui::GpuSwitchingManager::SetTransparent(window_->transparent());
#if defined(TOOLKIT_VIEWS)
  
  mate::Handle<NativeImage> icon;
  if (options.Get(options::kIcon, &icon) && !icon.IsEmpty())
    SetIcon(icon);
#endif
  window_->InitFromOptions(options);
  window_->AddObserver(this);
  InitWith(isolate, wrapper);
  AttachAsUserData(window_.get());
  
  
  if (!parent.IsEmpty())
    parent->child_windows_.Set(isolate, ID(), wrapper);
  auto* host = web_contents->web_contents()->GetRenderViewHost();
  if (host)
    host->GetWidget()->AddInputEventObserver(this);
}
BrowserWindow::~BrowserWindow() {