Properly set ShelfAlignment during login

ash/test/test_session_state_delegate.h

 // 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 ASH_TEST_TEST_SESSION_STATE_DELEGATE_H_
 #define ASH_TEST_TEST_SESSION_STATE_DELEGATE_H_
 
 #include <vector>
 
 #include "ash/session/session_state_delegate.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/gfx/image/image_skia.h"
 
 namespace ash {
 namespace test {
 
 class MockUserInfo;
 
 class TestSessionStateDelegate : public SessionStateDelegate {
  public:
   TestSessionStateDelegate();
   ~TestSessionStateDelegate() override;
 
   void set_logged_in_users(int users) { logged_in_users_ = users; }
+  void set_session_state(SessionState session_state) {
+    session_state_ = session_state;
+  }
   void AddUser(const std::string user_id);
   const user_manager::UserInfo* GetActiveUserInfo() const;
 
   // SessionStateDelegate:
   content::BrowserContext* GetBrowserContextByIndex(
       MultiProfileIndex index) override;
   content::BrowserContext* GetBrowserContextForWindow(
       aura::Window* window) override;
   int GetMaximumNumberOfLoggedInUsers() const override;
   int NumberOfLoggedInUsers() const override;
@@ skipping 68 matching lines @@
   bool user_adding_screen_running_;
 
   // The number of users logged in.
   int logged_in_users_;
 
   // The index for the activated user.
   int active_user_index_;
 
   std::vector<MockUserInfo*> user_list_;
 
+  // The current state of the login screen. |session_state_| becomes active
+  // before the profile and browser UI are available.
+  SessionState session_state_;
+
   DISALLOW_COPY_AND_ASSIGN(TestSessionStateDelegate);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SESSION_STATE_DELEGATE_H_