Place the spinner in the right corner of the controls window.

chrome/browser/chromeos/login/screen_locker.h

 // Copyright (c) 2010 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_SCREEN_LOCKER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_H_
 #pragma once
 
 #include <string>
 
@@ skipping 14 matching lines @@
 
 namespace chromeos {
 
 class Authenticator;
 class BackgroundView;
 class InputEventObserver;
 class LockerInputEventObserver;
 class MessageBubble;
 class MouseEventRelay;
 class ScreenLockView;
+class ThrobberManager;
 class LoginFailure;
 
 namespace test {
 class ScreenLockerTester;
 }  // namespace test
 
 // ScreenLocker creates a background view as well as ScreenLockView to
 // authenticate the user. ScreenLocker manages its life cycle and will
 // delete itself when it's unlocked.
 class ScreenLocker : public LoginStatusConsumer,
@@ skipping 66 matching lines @@
   // Returns the tester
   static test::ScreenLockerTester* GetTester();
 
  private:
   friend class DeleteTask<ScreenLocker>;
   friend class test::ScreenLockerTester;
   friend class LockerInputEventObserver;
 
   virtual ~ScreenLocker();
 
+  // Starts/Stops throbber.
+  void StartThrobber();
+  void StopThrobber();

[oshima, 2010/12/09 21:52:10]

Looks like it's simpler to have these method and ThrobberManager in 
ScreenLockView than here.  What do you think?

[altimofeev, 2010/12/10 16:37:40]

I put it here because created throbber belongs to views hierarchy that differs
from the one of the ScreenLockView.

Anyway, since there is the only view that is used by ScreenLocker, I moved the
ThrobberManager to ScreenLockView, as you had suggested.

+
   // Sets the authenticator.
   void SetAuthenticator(Authenticator* authenticator);
 
   // Called when the screen lock is ready.
   void ScreenLockReady();
 
   // Called when the window manager is ready to handle locked state.
   void OnWindowManagerReady();
 
   // Shows error_info_ bubble with the |message| and |arrow_location| specified.
@@ skipping 65 matching lines @@
 
   // Reference to the single instance of the screen locker object.
   // This is used to make sure there is only one screen locker instance.
   static ScreenLocker* screen_locker_;
 
   // The time when the screen locker object is created.
   base::Time start_time_;
   // The time when the authentication is started.
   base::Time authentication_start_time_;
 
+  scoped_ptr<ThrobberManager> throbber_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(ScreenLocker);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SCREEN_LOCKER_H_