- 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
window_->SetBackgroundColor(color_name);
}
void Window::SetHasShadow(bool has_shadow) {
  window_->SetHasShadow(has_shadow);
}
bool Window::HasShadow() {
  return window_->HasShadow();
}
void Window::FocusOnWebView() {
  window_->FocusOnWebView();
}
void Window::BlurWebView() {
  window_->BlurWebView();
}
bool Window::IsWebViewFocused() {
  return window_->IsWebViewFocused();
}
void Window::SetRepresentedFilename(const std::string& filename) {
  window_->SetRepresentedFilename(filename);
}
std::string Window::GetRepresentedFilename() {
  return window_->GetRepresentedFilename();
}
void Window::SetDocumentEdited(bool edited) {
  window_->SetDocumentEdited(edited);
}
bool Window::IsDocumentEdited() {
  return window_->IsDocumentEdited();
}
void Window::SetIgnoreMouseEvents(bool ignore) {