- 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.h
v8::Global<v8::Value> web_contents_;
  v8::Global<v8::Value> menu_;
  v8::Global<v8::Value> parent_window_;
  KeyWeakMap<int> child_windows_;
  api::WebContents* api_web_contents_;
  std::unique_ptr<NativeWindow> window_;
  DISALLOW_COPY_AND_ASSIGN(Window);
};
}  
}  
namespace mate {
template<>
struct Converter<atom::NativeWindow*> {
  static bool FromV8(v8::Isolate* isolate, v8::Local<v8::Value> val,
                     atom::NativeWindow** out) {
    
    if (val->IsNull()) {
      *out = NULL;
      return true;
    }
    atom::api::Window* window;
    if (!Converter<atom::api::Window*>::FromV8(isolate, val, &window))
      return false;
    *out = window->window();
    return true;
  }
};
}  
#endif