* 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
CR_DEFINE_STATIC_LOCAL(const gfx::FontRenderParams, params,
      (gfx::GetFontRenderParams(gfx::FontRenderParamsQuery(), nullptr)));
  prefs->should_antialias_text = params.antialiasing;
  prefs->use_subpixel_positioning = params.subpixel_positioning;
  prefs->hinting = params.hinting;
  prefs->use_autohinter = params.autohinter;
  prefs->use_bitmaps = params.use_bitmaps;
  prefs->subpixel_rendering = params.subpixel_rendering;
#endif
  
  
  ui::GpuSwitchingManager::SetTransparent(transparent_);
  WindowList::AddWindow(this);
}
NativeWindow::~NativeWindow() {
  
  
  NotifyWindowClosed();
}
NativeWindow* NativeWindow::FromWebContents(
    content::WebContents* web_contents) {
  WindowList& window_list = *WindowList::GetInstance();
  for (NativeWindow* window : window_list) {
    if (window->web_contents() == web_contents)
      return window;
  }
  return nullptr;
}
void NativeWindow::InitFromOptions(const mate::Dictionary& options) {