Converts DockedWindowLayoutManager to common ash/wm types

ash/wm/aura/wm_root_window_controller_aura.cc

 // 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.
 
 #include "ash/wm/aura/wm_root_window_controller_aura.h"
 
 #include "ash/display/window_tree_host_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/wm/aura/wm_globals_aura.h"
@@ skipping 58 matching lines @@
 }
 
 WorkspaceWindowState WmRootWindowControllerAura::GetWorkspaceWindowState() {
   return root_window_controller_->workspace_controller()->GetWindowState();
 }
 
 WmWindow* WmRootWindowControllerAura::GetWindow() {
   return WmWindowAura::Get(root_window_controller_->GetRootWindow());
 }
 
+void WmRootWindowControllerAura::ConfigureWidgetInitParamsForContainer(
+    views::Widget* widget,
+    int shell_container_id,
+    views::Widget::InitParams* init_params) {
+  init_params->parent = Shell::GetContainer(
+      root_window_controller_->GetRootWindow(), shell_container_id);
+}
 }  // namespace wm
 }  // namespace ash