Make ui::test::EventGenerator work with PointerEvents in mash

ui/aura/test/event_generator_delegate_aura.h

Index: ui/aura/test/event_generator_delegate_aura.h
diff --git a/ui/aura/test/event_generator_delegate_aura.h b/ui/aura/test/event_generator_delegate_aura.h
index 9ba58e180e05014c0555c9bfa98fe5d219247c45..82b013dbe86751c64ba2dec86b359556978e6ca7 100644
--- a/ui/aura/test/event_generator_delegate_aura.h
+++ b/ui/aura/test/event_generator_delegate_aura.h
@@ -48,6 +48,8 @@ class EventGeneratorDelegateAura : public ui::test::EventGeneratorDelegate {
                             gfx::Point* point) const override;
   void DispatchKeyEventToIME(ui::EventTarget* target,
                              ui::KeyEvent* event) override;
+  void DispatchEventToPointerWatchers(ui::EventTarget* target,
+                                      const ui::PointerEvent& event) override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(EventGeneratorDelegateAura);