* 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
#if defined(OS_WIN)
  static_cast<NativeWindowViews*>(window_.get())->SetIcon(
      icon->GetHICON(GetSystemMetrics(SM_CXSMICON)),
      icon->GetHICON(GetSystemMetrics(SM_CXICON)));
#elif defined(USE_X11)
  static_cast<NativeWindowViews*>(window_.get())->SetIcon(
      icon->image().AsImageSkia());
#endif
}
#endif
void BrowserWindow::SetAspectRatio(double aspect_ratio, mate::Arguments* args) {
  gfx::Size extra_size;
  args->GetNext(&extra_size);
  window_->SetAspectRatio(aspect_ratio, extra_size);
}
void BrowserWindow::PreviewFile(const std::string& path,