- 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_observer.h
virtual void OnWindowMaximize() {}
  virtual void OnWindowUnmaximize() {}
  virtual void OnWindowMinimize() {}
  virtual void OnWindowRestore() {}
  virtual void OnWindowResize() {}
  virtual void OnWindowMove() {}
  virtual void OnWindowMoved() {}
  virtual void OnWindowScrollTouchBegin() {}
  virtual void OnWindowScrollTouchEnd() {}
  virtual void OnWindowSwipe(const std::string& direction) {}
  virtual void OnWindowEnterFullScreen() {}
  virtual void OnWindowLeaveFullScreen() {}
  virtual void OnWindowEnterHtmlFullScreen() {}
  virtual void OnWindowLeaveHtmlFullScreen() {}
  
  #if defined(OS_WIN)
  virtual void OnWindowMessage(UINT message, WPARAM w_param, LPARAM l_param) {}
  #endif
  
  virtual void OnRendererUnresponsive() {}
  
  virtual void OnRendererResponsive() {}
  
  virtual void OnExecuteWindowsCommand(const std::string& command_name) {}
};
}  
#endif