Properly set ShelfAlignment during login

ash/shelf/shelf_layout_manager.h

 // Copyright 2012 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_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 308 matching lines @@
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
 
   // Overridden from DockedWindowLayoutManagerObserver:
   void OnDockBoundsChanging(
       const gfx::Rect& dock_bounds,
       DockedWindowLayoutManagerObserver::Reason reason) override;
 
   // Called when the LoginUI changes from visible to invisible.
   void UpdateShelfVisibilityAfterLoginUIChange();
 
+  // Returns true when |alignment_| is locked. This can be caused by the screen
+  // being locked, or when adding a user. Returns false when transitioning to a
+  // user session, and while the session is active.
+  bool IsAlignmentLocked() const;
+
   // The RootWindow is cached so that we don't invoke Shell::GetInstance() from
   // our destructor. We avoid that as at the time we're deleted Shell is being
   // deleted too.
   aura::Window* root_window_;
 
   // True when inside UpdateBoundsAndOpacity() method. Used to prevent calling
   // UpdateBoundsAndOpacity() again from SetChildBounds().
   bool updating_bounds_;
 
   // See description above setter.
@@ skipping 57 matching lines @@
 
   // The show hide animation duration override or 0 for default.
   int duration_override_in_ms_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_H_