- Electron version: v1.3.3
- Operating system: OS X 10.11.6

v1.3.3 broke the detection of the `scroll-touch-begin` and `scroll-touch-end` events for me within a `webview`. It looks like the pull request #6754 caused this issue. v1.3.2 works as expected.

Behavior that I'm observing on v1.3.3:
- Most of the time, the `scroll-touch-*` events are not emitted when the cursor is on top of a `webview`.
- The `scroll-touch-*` events seem to be emitted _only once_ when the cursor is on a `webview` and on a scrollable element. The scrollable elements in my app have no native scrollbar set (they have the style `overflow: hidden;` set instead of `overflow: scroll;`). This is the case in which I need to receive the `scroll-touch-*` events.
- The `scroll-touch-*` events seem to work fine when the cursor is outside of the `webview` tag.

atom/browser/native_window.cc
ScheduleUnresponsiveEvent(50);
}
void NativeWindow::RendererResponsive(content::WebContents* source) {
  window_unresposive_closure_.Cancel();
  FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnRendererResponsive());
}
void NativeWindow::NotifyWindowClosed() {
  if (is_closed_)
    return;
  WindowList::RemoveWindow(this);
  is_closed_ = true;
  FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnWindowClosed());
}
void NativeWindow::NotifyWindowBlur() {
  FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnWindowBlur());
}
void NativeWindow::NotifyWindowFocus() {
  FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnWindowFocus());
}
void NativeWindow::NotifyWindowShow() {
  FOR_EACH_OBSERVER(NativeWindowObserver, observers_, OnWindowShow());
}
void NativeWindow::NotifyWindowHide() {