Removes most of aura dependencies from DefaultState

ash/wm/common/window_parenting_utils.h

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ASH_WM_COMMON_WINDOW_PARENTING_UTILS_H_
+#define ASH_WM_COMMON_WINDOW_PARENTING_UTILS_H_
+
+#include "ash/ash_export.h"
+
+namespace ash {
+namespace wm {
+
+class WmWindow;
+
+// Changes the parent of a |child| and all its transient children that are
+// themselves children of |old_parent| to |new_parent|.
+void ReparentChildWithTransientChildren(WmWindow* child,
+                                        WmWindow* old_parent,
+                                        WmWindow* new_parent);
+
+// Changes the parent of all transient children of a |child| to |new_parent|.
+// Does not change parent of the transient children that are not themselves
+// children of |old_parent|.
+void ReparentTransientChildrenOfChild(WmWindow* child,
+                                      WmWindow* old_parent,
+                                      WmWindow* new_parent);
+
+}  // namespace wm
+}  // namespace ash
+
+#endif  // ASH_WM_COMMON_WINDOW_PARENTING_UTILS_H_