Update the layout mode first when exiting tablet mode

components/exo/wm_helper.cc

 // Copyright 2016 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.
 
 #include "components/exo/wm_helper.h"
 
 #include "base/memory/ptr_util.h"
 
 namespace exo {
 namespace {
@@ skipping 88 matching lines @@
 void WMHelper::NotifyCursorSetChanged(ui::CursorSetType cursor_set) {
   for (CursorObserver& observer : cursor_observers_)
     observer.OnCursorSetChanged(cursor_set);
 }
 
 void WMHelper::NotifyMaximizeModeStarted() {
   for (MaximizeModeObserver& observer : maximize_mode_observers_)
     observer.OnMaximizeModeStarted();
 }
 
+void WMHelper::NotifyMaximizeModeEnding() {
+  for (MaximizeModeObserver& observer : maximize_mode_observers_)
+    observer.OnMaximizeModeEnding();
+}
+
 void WMHelper::NotifyMaximizeModeEnded() {
   for (MaximizeModeObserver& observer : maximize_mode_observers_)
     observer.OnMaximizeModeEnded();
 }
 
 void WMHelper::NotifyAccessibilityModeChanged() {
   for (AccessibilityObserver& observer : accessibility_observers_)
     observer.OnAccessibilityModeChanged();
 }
 
 void WMHelper::NotifyKeyboardDeviceConfigurationChanged() {
   for (InputDeviceEventObserver& observer : input_device_event_observers_)
     observer.OnKeyboardDeviceConfigurationChanged();
 }
 
 }  // namespace exo