Restore screen work area after login

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index a3ec7395f4fbf95b5b91d5360229a98443359f3d..7c42ca72e5feeccb5c0ccefafceb2f4d469028c2 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -622,6 +622,9 @@ void RootWindowController::DeactivateKeyboard(
   if (keyboard_container->GetRootWindow() == root_window()) {
     root_window()->RemoveChild(keyboard_container);
     if (!keyboard::IsKeyboardUsabilityExperimentEnabled()) {
+      // Virtual keyboard may be deactivated while still showing, notify all
+      // observers that keyboard bounds changed to 0 before remove them.
+      keyboard_controller->NotifyKeyboardBoundsChanging(gfx::Rect());
       keyboard_controller->RemoveObserver(shelf()->shelf_layout_manager());
       keyboard_controller->RemoveObserver(panel_layout_manager_);
       keyboard_controller->RemoveObserver(docked_layout_manager_);