Reset the experimental app list to the start page on dismiss.

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 80afe47337327df2a648cd5d75fc376ed364924e..dfc5ea0493a9b33f792c11103a52968d2ebe1fe3 100644
--- a/ui/app_list/views/app_list_main_view.cc
+++ b/ui/app_list/views/app_list_main_view.cc
@@ -186,6 +186,10 @@ void AppListMainView::ShowAppListWhenReady() {
 }
 
 void AppListMainView::ResetForShow() {
+  if (switches::IsExperimentalAppListEnabled()) {
+    contents_view_->SetActivePage(contents_view_->GetPageIndexForNamedPage(
+        ContentsView::NAMED_PAGE_START));
+  }
   contents_view_->apps_container_view()->ResetForShowApps();
   // We clear the search when hiding so when app list appears it is not showing
   // search results.