- 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.h
double sheet_offset_x_;
  double sheet_offset_y_;
  
  
  double aspect_ratio_;
  gfx::Size aspect_ratio_extraSize_;
  
  NativeWindow* parent_;
  
  bool is_modal_;
  
  brightray::InspectableWebContents* inspectable_web_contents_;
  
  base::ObserverList<NativeWindowObserver> observers_;
  base::WeakPtrFactory<NativeWindow> weak_factory_;
  DISALLOW_COPY_AND_ASSIGN(NativeWindow);
};
class NativeWindowRelay :
    public content::WebContentsUserData<NativeWindowRelay> {
 public:
  explicit NativeWindowRelay(base::WeakPtr<NativeWindow> window)
    : key(UserDataKey()), window(window) {}
  void* key;
  base::WeakPtr<NativeWindow> window;
 private:
  friend class content::WebContentsUserData<NativeWindow>;
};
}  
#endif