Add View::ReorderChildView and Widget::MoveToTop.

views/widget/widget.cc

Index: views/widget/widget.cc
diff --git a/views/widget/widget.cc b/views/widget/widget.cc
index 50001563f6b89e2ef1e9d5784d7149131a96089d..bd6d872ce128c5ffe80a275c7f3afca05d817954 100644
--- a/views/widget/widget.cc
+++ b/views/widget/widget.cc
@@ -329,6 +329,10 @@ void Widget::MoveAbove(gfx::NativeView native_view) {
   native_widget_->MoveAbove(native_view);
 }
 
+void Widget::MoveToTop() {
+  native_widget_->MoveToTop();
+}
+
 void Widget::SetShape(gfx::NativeRegion shape) {
   native_widget_->SetShape(shape);
 }