* Electron version: 1.6.0
* Operating system: MacOS 10.12.2

### Expected behavior

'scroll-touch-end' emits when trackpad scrolling ends.

### Actual behavior

The begin event emits, but not the end

### How to reproduce

Example repo: https://github.com/pfrazee/electron-bug-no-scroll-touch-end

atom/browser/native_window.cc
options.Get(options::kFullScreenable, &fullscreenable);
  SetFullScreenable(fullscreenable);
  if (fullscreen) {
    SetFullScreen(true);
  }
  bool skip;
  if (options.Get(options::kSkipTaskbar, &skip)) {
    SetSkipTaskbar(skip);
  }
  bool kiosk;
  if (options.Get(options::kKiosk, &kiosk) && kiosk) {
    SetKiosk(kiosk);
  }
  std::string color;
  if (options.Get(options::kBackgroundColor, &color)) {
    SetBackgroundColor(color);
  } else if (!transparent()) {
    
    SetBackgroundColor("#FFFF");
  }
  std::string title(Browser::Get()->GetName());
  options.Get(options::kTitle, &title);
  SetTitle(title);
  
  bool show = true;
  options.Get(options::kShow, &show);
  if (show)
    Show();
}
void NativeWindow::SetSize(const gfx::Size& size, bool animate) {