Introduces AppActivity and handler of chrome.shell API.

apps/shell/browser/default_shell_browser_main_delegate.cc

 // Copyright 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 "apps/shell/browser/default_shell_browser_main_delegate.h"
 
+#include "apps/shell/browser/default_shell_app_window_controller.h"
 #include "apps/shell/browser/shell_desktop_controller.h"
 #include "apps/shell/browser/shell_extension_system.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 
 namespace apps {
 
 DefaultShellBrowserMainDelegate::DefaultShellBrowserMainDelegate() {
 }
@@ skipping 18 matching lines @@
   } else {
     LOG(ERROR) << "--" << kAppSwitch << " unset; boredom is in your future";
   }
 }
 
 void DefaultShellBrowserMainDelegate::Shutdown() {
 }
 
 ShellDesktopController*
 DefaultShellBrowserMainDelegate::CreateDesktopController() {
-  return new ShellDesktopController();
+  ShellDesktopController* desktop = new ShellDesktopController();
+  desktop->SetAppWindowController(new DefaultShellAppWindowController(desktop));
+  return desktop;
 }
 
 }  // namespace apps