Initial views touchui GestureRecognizer support

views/widget/widget.cc

Index: views/widget/widget.cc
diff --git a/views/widget/widget.cc b/views/widget/widget.cc
index acc7108bbf5940db385b0d45726db80fc2e1a7f3..ccb9bda966cea2bae1942d0426f32b912d4c8a32 100644
--- a/views/widget/widget.cc
+++ b/views/widget/widget.cc
@@ -1049,7 +1049,12 @@ void Widget::OnMouseCaptureLost() {
 
 ui::TouchStatus Widget::OnTouchEvent(const TouchEvent& event) {
   ScopedEvent scoped(this, event);
-  return static_cast<internal::RootView*>(GetRootView())->OnTouchEvent(event);
+  return GetRootView()->OnTouchEvent(event);
+}
+
+bool Widget::OnGestureEvent(const GestureEvent& event) {
+  ScopedEvent scoped(this, event);
+  GetRootView()->OnGestureEvent(event);
 }
 
 bool Widget::ExecuteCommand(int command_id) {