Lock Rotation on user settings changes

ash/system/chromeos/rotation/tray_rotation_lock.h

 // Copyright 2014 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_SYSTEM_CHROMEOS_ROTATION_TRAY_ROTATION_LOCK_H_
 #define ASH_SYSTEM_CHROMEOS_ROTATION_TRAY_ROTATION_LOCK_H_
 
 #include "ash/shell_observer.h"
 #include "ash/system/tray/tray_image_item.h"
+#include "ash/wm/maximize_mode/maximize_mode_controller.h"
 
 namespace ash {
 
 namespace tray {
 class RotationLockDefaultView;
 }  // namespace tray
 
 // TrayRotationLock is a provider of views for the SystemTray. Both a tray view
 // and a default view are provided. Each view indicates the current state of
 // the rotation lock for the display which it appears on. The default view can
 // be interacted with, it toggles the state of the rotation lock.
 // TrayRotationLock is only available on the primary display.
 class ASH_EXPORT TrayRotationLock : public TrayImageItem,
+                                    public MaximizeModeController::Observer,
                                     public ShellObserver {
  public:
   explicit TrayRotationLock(SystemTray* system_tray);
   virtual ~TrayRotationLock();
 
+  // MaximizeModeController::Observer:
+  virtual void OnRotationLockChanged(bool rotation_locked) OVERRIDE;
+
   // SystemTrayItem:
   virtual views::View* CreateDefaultView(user::LoginStatus status) OVERRIDE;
 
   // ShellObserver:
   virtual void OnMaximizeModeStarted() OVERRIDE;
   virtual void OnMaximizeModeEnded() OVERRIDE;
 
  protected:
   // TrayImageItem:
   virtual bool GetInitialVisibility() OVERRIDE;
 
  private:
   friend class TrayRotationLockTest;
 
+  // True if |on_primary_display_|, maximize mode is enabled, and rotation is
+  // locked.
+  bool ShouldBeVisible();
+
   // True if this has been created by a SystemTray on the primary display.
   bool on_primary_display_;
 
   DISALLOW_COPY_AND_ASSIGN(TrayRotationLock);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_CHROMEOS_ROTATION_TRAY_ROTATION_LOCK_H_