Add ShellAppsClient, ShellAppDelegate, ShellNativeAppWindow

extensions/shell/browser/shell_desktop_controller.cc

Index: extensions/shell/browser/shell_desktop_controller.cc
diff --git a/extensions/shell/browser/shell_desktop_controller.cc b/extensions/shell/browser/shell_desktop_controller.cc
index 48696bddb2904a944487ee9b8f1b6d104f8edb5e..625547bd3d43bb31cda7e60efc73827f88271bdd 100644
--- a/extensions/shell/browser/shell_desktop_controller.cc
+++ b/extensions/shell/browser/shell_desktop_controller.cc
@@ -189,12 +189,17 @@ ShellAppWindow* ShellDesktopController::CreateAppWindow(
 
   // Attach the web contents view to our window hierarchy.
   aura::Window* content = app_window_->GetNativeWindow();
-  root_window->AddChild(content);
+  AddAppWindow(content);
   content->Show();
 
   return app_window_.get();
 }
 
+void ShellDesktopController::AddAppWindow(aura::Window* window) {
+  aura::Window* root_window = GetHost()->window();
+  root_window->AddChild(window);
+}
+
 void ShellDesktopController::CloseAppWindows() {
   app_window_.reset();
 }