Moves management of transients out of Window

ui/views/corewm/transient_window_controller.h

+// Copyright (c) 2014 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 UI_VIEWS_COREWM_TRANSIENT_WINDOW_CONTROLLER_H_
+#define UI_VIEWS_COREWM_TRANSIENT_WINDOW_CONTROLLER_H_
+
+#include "ui/aura/client/transient_window_client.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+namespace corewm {
+
+// TransientWindowClient implementation. Uses TransientWindowManager to handle
+// tracking transient per window.
+class VIEWS_EXPORT TransientWindowController
+    : public aura::client::TransientWindowClient {
+ public:
+  TransientWindowController();
+  virtual ~TransientWindowController();
+
+  // TransientWindowClient:
+  virtual void AddTransientChild(aura::Window* parent,
+                                 aura::Window* child) OVERRIDE;
+  virtual void RemoveTransientChild(aura::Window* parent,
+                                    aura::Window* child) OVERRIDE;
+  virtual aura::Window* GetTransientParent(aura::Window* window) OVERRIDE;
+  virtual const aura::Window* GetTransientParent(
+      const aura::Window* window) OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(TransientWindowController);
+};
+
+}  // namespace corewm
+}  // namespace views
+
+#endif  // UI_VIEWS_COREWM_TRANSIENT_WINDOW_CONTROLLER_H_