Added UI to enable debugging features on CrOS

chrome/browser/chromeos/login/screens/enable_debugging_screen.h

Index: chrome/browser/chromeos/login/screens/enable_debugging_screen.h
diff --git a/chrome/browser/chromeos/login/screens/enable_debugging_screen.h b/chrome/browser/chromeos/login/screens/enable_debugging_screen.h
new file mode 100644
index 0000000000000000000000000000000000000000..a5f148545099e7b2694e4ee161765f890d163b6d
--- /dev/null
+++ b/chrome/browser/chromeos/login/screens/enable_debugging_screen.h
@@ -0,0 +1,43 @@
+// Copyright (c) 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 CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_ENABLE_DEBUGGING_SCREEN_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_ENABLE_DEBUGGING_SCREEN_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "chrome/browser/chromeos/login/screens/base_screen.h"
+#include "chrome/browser/chromeos/login/screens/enable_debugging_screen_actor.h"
+
+namespace chromeos {
+
+// Representation independent class that controls screen showing enable
+// debugging screen to users.
+class EnableDebuggingScreen : public BaseScreen,
+                              public EnableDebuggingScreenActor::Delegate {
+ public:
+  EnableDebuggingScreen(BaseScreenDelegate* delegate,
+                        EnableDebuggingScreenActor* actor);
+  virtual ~EnableDebuggingScreen();
+
+  // BaseScreen implementation:
+  virtual void PrepareToShow() override;
+  virtual void Show() override;
+  virtual void Hide() override;
+  virtual std::string GetName() const override;
+
+  // EnableDebuggingScreenActor::Delegate implementation:
+  virtual void OnExit(bool success) override;
+  virtual void OnActorDestroyed(EnableDebuggingScreenActor* actor) override;
+
+ private:
+  EnableDebuggingScreenActor* actor_;
+
+  DISALLOW_COPY_AND_ASSIGN(EnableDebuggingScreen);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREENS_ENABLE_DEBUGGING_SCREEN_H_