Introduces AppActivity and handler of chrome.shell API.

apps/shell/browser/default_shell_app_window_controller.h

Index: apps/shell/browser/default_shell_app_window_controller.h
diff --git a/apps/shell/browser/default_shell_app_window_controller.h b/apps/shell/browser/default_shell_app_window_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..0203fe884cfabb98a046630afd298d6d7d80a132
--- /dev/null
+++ b/apps/shell/browser/default_shell_app_window_controller.h
@@ -0,0 +1,40 @@
+// 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.
+
+#ifndef APPS_SHELL_BROWSER_DEFAULT_SHELL_APP_WINDOW_CONTROLLER_H_
+#define APPS_SHELL_BROWSER_DEFAULT_SHELL_APP_WINDOW_CONTROLLER_H_
+
+#include "apps/shell/browser/shell_app_window_controller.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+
+namespace apps {
+
+class ShellDesktopController;
+
+// The default shell app window controller for app_shell.  It manages only one
+// app_window.

[James Cook, 2014/06/16 16:12:30]

Nice that you explained it handles a single window.

+class DefaultShellAppWindowController : public ShellAppWindowController {
+ public:
+  DefaultShellAppWindowController(

[James Cook, 2014/06/16 16:12:30]

explicit

[Jun Mukai, 2014/06/16 17:46:52]

Done.

+      ShellDesktopController* shell_desktop_controller);
+  virtual ~DefaultShellAppWindowController();
+
+  // Overridden from ShellAppWindowController:

[James Cook, 2014/06/16 16:12:30]

nit: The extensions code prefers "ShellAppWindowController implementation."  I
don't like it, but for app_shell I'm trying to use it.

[Jun Mukai, 2014/06/16 17:46:52]

Done.

+  virtual ShellAppWindow* CreateAppWindow(
+      content::BrowserContext* context) OVERRIDE;
+  virtual void CloseAppWindows() OVERRIDE;
+
+ private:
+  ShellDesktopController* shell_desktop_controller_;  // Not owned
+
+  // The desktop supports a single app window.
+  scoped_ptr<ShellAppWindow> app_window_;
+
+  DISALLOW_COPY_AND_ASSIGN(DefaultShellAppWindowController);
+};
+
+}  // namespace apps
+
+#endif  // APPS_SHELL_BROWSER_DEFAULT_SHELL_APP_WINDOW_CONTROLLER_H_