mash: Preliminary support for shelf auto-hide

ash/shelf/shelf_widget.cc

Index: ash/shelf/shelf_widget.cc
diff --git a/ash/shelf/shelf_widget.cc b/ash/shelf/shelf_widget.cc
index 601cecdfc73ed72ca7806716a6b4508f651afc02..3b04c957802a7e70ed1a68eadedd0c6fdf4afed7 100644
--- a/ash/shelf/shelf_widget.cc
+++ b/ash/shelf/shelf_widget.cc
@@ -794,6 +794,18 @@ void ShelfWidget::DisableDimmingAnimationsForTest() {
   return delegate_view_->disable_dimming_animations_for_test();
 }
 
+void ShelfWidget::OnMouseEvent(ui::MouseEvent* event) {
+  Widget::OnMouseEvent(event);
+  if (Shell::GetInstance()->in_mus() && shelf_layout_manager_)
+    shelf_layout_manager_->UpdateAutoHideForMouseEvent(event);
+}
+
+void ShelfWidget::OnGestureEvent(ui::GestureEvent* event) {
+  Widget::OnGestureEvent(event);
+  if (Shell::GetInstance()->in_mus() && shelf_layout_manager_)
+    shelf_layout_manager_->UpdateAutoHideForGestureEvent(event);
+}
+
 void ShelfWidget::WillDeleteShelf() {
   shelf_layout_manager_->RemoveObserver(this);
   shelf_layout_manager_ = NULL;