- 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/api/atom_api_window.cc
return window_->IsMinimizable();
}
void Window::SetMaximizable(bool maximizable) {
  window_->SetMaximizable(maximizable);
}
bool Window::IsMaximizable() {
  return window_->IsMaximizable();
}
void Window::SetFullScreenable(bool fullscreenable) {
  window_->SetFullScreenable(fullscreenable);
}
bool Window::IsFullScreenable() {
  return window_->IsFullScreenable();
}
void Window::SetClosable(bool closable) {
  window_->SetClosable(closable);
}
bool Window::IsClosable() {
  return window_->IsClosable();
}
void Window::SetAlwaysOnTop(bool top) {
  window_->SetAlwaysOnTop(top);
}
bool Window::IsAlwaysOnTop() {
  return window_->IsAlwaysOnTop();
}
void Window::Center() {
  window_->Center();
}
void Window::SetPosition(int x, int y, mate::Arguments* args) {