Add ShellAppsClient, ShellAppDelegate, ShellNativeAppWindow

extensions/shell/browser/desktop_controller.h

Index: extensions/shell/browser/desktop_controller.h
diff --git a/extensions/shell/browser/desktop_controller.h b/extensions/shell/browser/desktop_controller.h
index 950320c646c55ce38c8f8f50262610469f369f7b..54f01062492e59225fd999c8bfc0608331f83f5f 100644
--- a/extensions/shell/browser/desktop_controller.h
+++ b/extensions/shell/browser/desktop_controller.h
@@ -6,6 +6,7 @@
 #define EXTENSIONS_SHELL_BROWSER_DESKTOP_CONTROLLER_H_
 
 namespace aura {
+class Window;
 class WindowTreeHost;
 }
 
@@ -40,6 +41,9 @@ class DesktopController {
   virtual ShellAppWindow* CreateAppWindow(content::BrowserContext* context,
                                           const Extension* extension) = 0;
 
+  // Attaches the window to our window hierarchy.
+  virtual void AddAppWindow(aura::Window* window) = 0;
+
   // Closes and destroys the app windows.
   virtual void CloseAppWindows() = 0;
 };