* 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
return window_->SetContentProtection(enable);
}
void BrowserWindow::SetFocusable(bool focusable) {
  return window_->SetFocusable(focusable);
}
void BrowserWindow::SetProgressBar(double progress, mate::Arguments* args) {
  mate::Dictionary options;
  std::string mode;
  NativeWindow::ProgressState state = NativeWindow::PROGRESS_NORMAL;
  args->GetNext(&options) && options.Get("mode", &mode);
  if (mode == "error") {
    state = NativeWindow::PROGRESS_ERROR;
  } else if (mode == "paused") {
    state = NativeWindow::PROGRESS_PAUSED;
  } else if (mode == "indeterminate") {
    state = NativeWindow::PROGRESS_INDETERMINATE;
  } else if (mode == "none") {
    state = NativeWindow::PROGRESS_NONE;
  }
  window_->SetProgressBar(progress, state);
}
void BrowserWindow::SetOverlayIcon(const gfx::Image& overlay,
                            const std::string& description) {
  window_->SetOverlayIcon(overlay, description);
}
bool BrowserWindow::SetThumbarButtons(mate::Arguments* args) {