Implemented screen notifying users about malformed HWID.

chrome/browser/chromeos/login/wrong_hwid_screen_actor.h

Index: chrome/browser/chromeos/login/wrong_hwid_screen_actor.h
diff --git a/chrome/browser/chromeos/login/wrong_hwid_screen_actor.h b/chrome/browser/chromeos/login/wrong_hwid_screen_actor.h
new file mode 100644
index 0000000000000000000000000000000000000000..0ef7fda4fd613f68ddcb59a784106f83b2659c97
--- /dev/null
+++ b/chrome/browser/chromeos/login/wrong_hwid_screen_actor.h
@@ -0,0 +1,40 @@
+// Copyright (c) 2013 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_WRONG_HWID_SCREEN_ACTOR_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_WRONG_HWID_SCREEN_ACTOR_H_
+
+#include <string>
+
+namespace chromeos {
+
+// Interface between wrong HWID screen and its representation.
+// Note, do not forget to call OnActorDestroyed in the dtor.
+class WrongHWIDScreenActor {
+ public:
+  // Allows us to get info from wrong HWID screen that we need.
+  class Delegate {
+   public:
+    virtual ~Delegate() {}
+
+    // Called when screen is exited.
+    virtual void OnExit() = 0;
+
+    // This method is called, when actor is being destroyed. Note, if Delegate
+    // is destroyed earlier then it has to call SetDelegate(NULL).
+    virtual void OnActorDestroyed(WrongHWIDScreenActor* actor) = 0;
+  };
+
+  virtual ~WrongHWIDScreenActor() {}
+
+  virtual void PrepareToShow() = 0;
+  virtual void Show() = 0;
+  virtual void Hide() = 0;
+  virtual void SetDelegate(Delegate* delegate) = 0;
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WRONG_HWID_SCREEN_ACTOR_H_
+