Use centered app list position whenever virtual keyboard is enabled.

ui/app_list/views/app_list_main_view.cc

Index: ui/app_list/views/app_list_main_view.cc
diff --git a/ui/app_list/views/app_list_main_view.cc b/ui/app_list/views/app_list_main_view.cc
index 28c06a10a8e4504a25f45d084328b8d8920e0963..b6255a0e4eec10460decf4829543adbd4f8a6c4f 100644
--- a/ui/app_list/views/app_list_main_view.cc
+++ b/ui/app_list/views/app_list_main_view.cc
@@ -170,6 +170,10 @@ void AppListMainView::SetDragAndDropHostOfCurrentAppList(
   contents_view_->SetDragAndDropHostOfCurrentAppList(drag_and_drop_host);
 }
 
+bool AppListMainView::ShouldCenterWindow() const {
+  return delegate_->ShouldCenterWindow();
+}
+
 void AppListMainView::PreloadIcons(gfx::NativeView parent) {
   ui::ScaleFactor scale_factor = ui::SCALE_FACTOR_100P;
   if (parent)