- 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
void Center();
  void SetPosition(int x, int y, mate::Arguments* args);
  std::vector<int> GetPosition();
  void SetTitle(const std::string& title);
  std::string GetTitle();
  void FlashFrame(bool flash);
  void SetSkipTaskbar(bool skip);
  void SetKiosk(bool kiosk);
  bool IsKiosk();
  void SetBackgroundColor(const std::string& color_name);
  void SetHasShadow(bool has_shadow);
  bool HasShadow();
  void FocusOnWebView();
  void BlurWebView();
  bool IsWebViewFocused();
  void SetRepresentedFilename(const std::string& filename);
  std::string GetRepresentedFilename();
  void SetDocumentEdited(bool edited);
  bool IsDocumentEdited();
  void SetIgnoreMouseEvents(bool ignore);
  void SetContentProtection(bool enable);
  void SetFocusable(bool focusable);
  void SetProgressBar(double progress, mate::Arguments* args);
  void SetOverlayIcon(const gfx::Image& overlay,
                      const std::string& description);
  bool SetThumbarButtons(mate::Arguments* args);
  void SetMenu(v8::Isolate* isolate, v8::Local<v8::Value> menu);
  void SetAutoHideMenuBar(bool auto_hide);
  bool IsMenuBarAutoHide();
  void SetMenuBarVisibility(bool visible);