Fix shelf layout when switching from left-aligned shelf to right-aligned shelf

ash/common/system/chromeos/session/logout_button_tray.h

 // Copyright 2014 The Chromium Authors. All rights reserved.

[tdanderson, 2016/06/29 17:46:19]

nit: please format the CL description as:

<title>
<blank line>
<brief description of CL>

Please also explicitly call out that this is intended to fix a non-MD regression
and be a noop for MD.

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_COMMON_SYSTEM_CHROMEOS_SESSION_LOGOUT_BUTTON_TRAY_H_
 #define ASH_COMMON_SYSTEM_CHROMEOS_SESSION_LOGOUT_BUTTON_TRAY_H_
 
 #include "ash/ash_export.h"
 #include "ash/common/login_status.h"
 #include "ash/common/system/chromeos/session/logout_button_observer.h"
 #include "ash/common/system/tray/tray_background_view.h"
@@ skipping 10 matching lines @@
 // Adds a logout button to the launcher's status area if enabled by the
 // kShowLogoutButtonInTray pref.
 class ASH_EXPORT LogoutButtonTray : public TrayBackgroundView,
                                     public LogoutButtonObserver,
                                     public views::ButtonListener {
  public:
   explicit LogoutButtonTray(WmShelf* wm_shelf);
   ~LogoutButtonTray() override;
 
   // TrayBackgroundView:
-  void SetShelfAlignment(ShelfAlignment alignment) override;
+  void SetShelfAlignment(ShelfAlignment alignment,
+                         const gfx::Insets& insets) override;
   base::string16 GetAccessibleNameForTray() override;
   void HideBubbleWithView(const views::TrayBubbleView* bubble_view) override;
   void ClickedOutsideBubble() override;
 
   // LogoutButtonObserver:
   void OnShowLogoutButtonInTrayChanged(bool show) override;
   void OnLogoutDialogDurationChanged(base::TimeDelta duration) override;
 
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
   void UpdateAfterLoginStatusChange(LoginStatus login_status);
 
  private:
   void UpdateVisibility();
 
   views::LabelButton* button_;
   LoginStatus login_status_;
   bool show_logout_button_in_tray_;
   base::TimeDelta dialog_duration_;
 
   DISALLOW_COPY_AND_ASSIGN(LogoutButtonTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_CHROMEOS_SESSION_LOGOUT_BUTTON_TRAY_H_