Extend MotionEvent to have tool type and button state

ui/events/gestures/motion_event_aura.cc

Index: ui/events/gestures/motion_event_aura.cc
diff --git a/ui/events/gestures/motion_event_aura.cc b/ui/events/gestures/motion_event_aura.cc
index 2bf4e9b3ce70005b1a0cb67a13f29dbe72d48bb9..6eea922748936d757796043ca55ac07eb3e70d0a 100644
--- a/ui/events/gestures/motion_event_aura.cc
+++ b/ui/events/gestures/motion_event_aura.cc
@@ -156,6 +156,16 @@ float MotionEventAura::GetHistoricalY(size_t pointer_index,
   return 0;
 }
 
+MotionEvent::ToolType MotionEventAura::GetToolType(size_t pointer_index) const {
+  NOTIMPLEMENTED();
+  return MotionEvent::TOOL_TYPE_UNKNOWN;
+}
+
+int MotionEventAura::GetButtonState() const {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 scoped_ptr<MotionEvent> MotionEventAura::Clone() const {
   return scoped_ptr<MotionEvent>(new MotionEventAura(pointer_count_,
                                                      last_touch_time_,