Drive extension functions from ExtensionFunction::Run. The

apps/shell/browser/shell_app_window_api.h

+// 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_SHELL_APP_WINDOW_API_H_
+#define APPS_SHELL_BROWSER_SHELL_APP_WINDOW_API_H_
+
+#include "base/compiler_specific.h"
+#include "extensions/browser/extension_function.h"
+
+namespace extensions {
+
+// A simplified implementation of the chrome.app.window.create() function for
+// app_shell. Opens a fullscreen window and invokes the window callback. Most
+// of the response is stub data, but the JS contentWindow is valid.
+class ShellAppWindowCreateFunction : public AsyncExtensionFunction {
+ public:
+  ShellAppWindowCreateFunction();
+
+  // Don't use the APP_WINDOW_CREATE histogram so we don't pollute the
+  // statistics for the real Chrome implementation.
+  DECLARE_EXTENSION_FUNCTION("app.window.create", UNKNOWN);
+
+ private:
+  virtual ~ShellAppWindowCreateFunction();
+  virtual bool RunAsync() OVERRIDE;
+};
+
+}  // namespace extensions
+
+#endif  // APPS_SHELL_BROWSER_SHELL_APP_WINDOW_API_H_