app_shell: Initial skeleton of a GCD target device setup API

extensions/shell/browser/api/shell_gcd/shell_gcd_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 EXTENSIONS_SHELL_BROWSER_API_SHELL_GCD_SHELL_GCD_API_H_
+#define EXTENSIONS_SHELL_BROWSER_API_SHELL_GCD_SHELL_GCD_API_H_
+
+#include "base/macros.h"
+#include "extensions/browser/extension_function.h"
+
+namespace extensions {
+
+// TODO(jamescook): Write this function. It needs to talk to privet via DBus.
+class ShellGcdGetSetupStatusFunction : public UIThreadExtensionFunction {
+ public:
+  DECLARE_EXTENSION_FUNCTION("shell.gcd.getSetupStatus", UNKNOWN);
+
+  ShellGcdGetSetupStatusFunction();
+
+ protected:
+  ~ShellGcdGetSetupStatusFunction() override;
+
+  // ExtensionFunction:
+  ResponseAction Run() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShellGcdGetSetupStatusFunction);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_SHELL_BROWSER_API_SHELL_GCD_SHELL_GCD_API_H_