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 c504175f376135bca0b98bd47f7791ba2d2343d8..ee3a29e6ea0377a76f95884e448fd56404b51652 100644
--- a/ash/shelf/shelf_widget.cc
+++ b/ash/shelf/shelf_widget.cc
@@ -803,4 +803,16 @@ void ShelfWidget::WillDeleteShelfLayoutManager() {
   shelf_layout_manager_ = NULL;
 }
 
+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);
+}
+
 }  // namespace ash