Fix user pod not always scroll to the center after VK shows up

ash/wm/lock_layout_manager.cc

Index: ash/wm/lock_layout_manager.cc
diff --git a/ash/wm/lock_layout_manager.cc b/ash/wm/lock_layout_manager.cc
index 590b949b383ca0dacb4adc1448fe950758f0008e..80e1b17d29093e365b6ec90e72f9c8710875132f 100644
--- a/ash/wm/lock_layout_manager.cc
+++ b/ash/wm/lock_layout_manager.cc
@@ -121,6 +121,9 @@ void LockLayoutManager::OnVirtualKeyboardStateChanged(bool activated) {
 }
 
 void LockLayoutManager::OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) {
+}
+
+void LockLayoutManager::OnKeyboardBoundsChanged(const gfx::Rect& new_bounds) {
   keyboard_bounds_ = new_bounds;
   OnWindowResized();
 }