Moves management of transients out of Window

ui/views/corewm/transient_window_controller.cc

Index: ui/views/corewm/transient_window_controller.cc
diff --git a/ui/views/corewm/transient_window_controller.cc b/ui/views/corewm/transient_window_controller.cc
new file mode 100644
index 0000000000000000000000000000000000000000..db78d35dad8c77cf789196a4113f1fd375040875
--- /dev/null
+++ b/ui/views/corewm/transient_window_controller.cc
@@ -0,0 +1,42 @@
+// 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.
+
+#include "ui/views/corewm/transient_window_controller.h"
+
+#include "ui/views/corewm/transient_window_manager.h"
+
+namespace views {
+namespace corewm {
+
+TransientWindowController::TransientWindowController() {
+}
+
+TransientWindowController::~TransientWindowController() {
+}
+
+void TransientWindowController::AddTransientChild(aura::Window* parent,
+                                                  aura::Window* child) {
+  TransientWindowManager::Get(parent)->AddTransientChild(child);
+}
+
+void TransientWindowController::RemoveTransientChild(aura::Window* parent,
+                                                     aura::Window* child) {
+  TransientWindowManager::Get(parent)->RemoveTransientChild(child);
+}
+
+aura::Window* TransientWindowController::GetTransientParent(
+    aura::Window* window) {
+  return const_cast<aura::Window*>(GetTransientParent(
+      const_cast<const aura::Window*>(window)));
+}
+
+const aura::Window* TransientWindowController::GetTransientParent(
+    const aura::Window* window) {
+  const TransientWindowManager* window_manager =
+      TransientWindowManager::Get(window);
+  return window_manager ? window_manager->transient_parent() : NULL;
+}
+
+}  // namespace corewm
+}  // namespace views