Separate athena's startup process from AppShell's

extensions/shell/browser/default_shell_app_window_controller.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 "extensions/shell/browser/default_shell_app_window_controller.h"
-
-#include "base/logging.h"
-#include "extensions/shell/browser/shell_app_window.h"
-#include "extensions/shell/browser/shell_desktop_controller.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_tree_host.h"
-
-namespace extensions {
-
-DefaultShellAppWindowController::DefaultShellAppWindowController(
-    ShellDesktopController* shell_desktop_controller)
-    : shell_desktop_controller_(shell_desktop_controller) {
-  DCHECK(shell_desktop_controller_);
-}
-
-DefaultShellAppWindowController::~DefaultShellAppWindowController() {
-  // The app window must be explicitly closed before desktop teardown.
-  DCHECK(!app_window_);
-}
-
-ShellAppWindow* DefaultShellAppWindowController::CreateAppWindow(
-    content::BrowserContext* context,
-    const Extension* extension) {
-  aura::Window* root_window = shell_desktop_controller_->host()->window();
-
-  app_window_.reset(new ShellAppWindow);
-  app_window_->Init(context, extension, root_window->bounds().size());
-
-  // Attach the web contents view to our window hierarchy.
-  aura::Window* content = app_window_->GetNativeWindow();
-  root_window->AddChild(content);
-  content->Show();
-
-  return app_window_.get();
-}
-
-void DefaultShellAppWindowController::CloseAppWindows() {
-  app_window_.reset();
-}
-
-}  // namespace extensions