[cros] Add blocking UI on offline: OK, online auth: fail case.

chrome/browser/chromeos/login/screen_locker.h

Index: chrome/browser/chromeos/login/screen_locker.h
diff --git a/chrome/browser/chromeos/login/screen_locker.h b/chrome/browser/chromeos/login/screen_locker.h
index 853c40f505a70cb2f22c94771c3d7995350eeae7..27e14045b260d51f62fbe2da7bd5541941ce2fdd 100644
--- a/chrome/browser/chromeos/login/screen_locker.h
+++ b/chrome/browser/chromeos/login/screen_locker.h
@@ -47,6 +47,11 @@ class ScreenLocker : public LoginStatusConsumer,
  public:
   explicit ScreenLocker(const UserManager::User& user);
 
+  // Returns the default instance if it has been created.
+  static ScreenLocker* default_screen_locker() {
+    return screen_locker_;
+  }
+
   // Initialize and show the screen locker.
   void Init();
 
@@ -76,6 +81,11 @@ class ScreenLocker : public LoginStatusConsumer,
   // Exit the chrome, which will sign out the current session.
   void Signout();
 
+  // Disables all UI needed and shows error bubble with |message|.
+  // If |sign_out_only| is true then all other input except "Sign Out"
+  // button is blocked.
+  void ShowErrorMessage(const std::wstring& message, bool sign_out_only);
+
   // Called when the all inputs are grabbed.
   void OnGrabInputs();
 
@@ -117,6 +127,11 @@ class ScreenLocker : public LoginStatusConsumer,
   // Called when the window manager is ready to handle locked state.
   void OnWindowManagerReady();
 
+  // Shows error_info_ bubble with the |message| and |arrow_location| specified.
+  // Assumes that UI controls were locked before that.
+  void ShowErrorBubble(const std::wstring& message,
+                       BubbleBorder::ArrowLocation arrow_location);
+
   // Stops screen saver.
   void StopScreenSaver();