Update the layout mode first when exiting tablet mode

components/exo/keyboard.h

 // Copyright 2015 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 COMPONENTS_EXO_KEYBOARD_H_
 #define COMPONENTS_EXO_KEYBOARD_H_
 
 #include <vector>
 
 #include "base/macros.h"
@@ skipping 34 matching lines @@
                        aura::Window* lost_focus) override;
 
   // Overridden from SurfaceObserver:
   void OnSurfaceDestroying(Surface* surface) override;
 
   // Overridden from ui::InputDeviceEventObserver:
   void OnKeyboardDeviceConfigurationChanged() override;
 
   // Overridden from WMHelper::MaximizeModeObserver:
   void OnMaximizeModeStarted() override;
+  void OnMaximizeModeEnding() override;
   void OnMaximizeModeEnded() override;
 
  private:
   // Returns the effective focus for |window|.
   Surface* GetEffectiveFocus(aura::Window* window) const;
 
   // The delegate instance that all events except for events about device
   // configuration are dispatched to.
   KeyboardDelegate* const delegate_;
 
   // The delegate instance that events about device configuration are dispatched
   // to.
   KeyboardDeviceConfigurationDelegate* device_configuration_delegate_ = nullptr;
 
   // The current focus surface for the keyboard.
   Surface* focus_ = nullptr;
 
   // Vector of currently pressed keys.
   std::vector<ui::DomCode> pressed_keys_;
 
   // Current set of modifier flags.
   int modifier_flags_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(Keyboard);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_KEYBOARD_H_