Fix experimental app list contents switcher being positioned incorrectly on profile switch.

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 fde4a329577cd9c410106f0782c0f9ad53b9a5dc..287c069593f21e9124883f78a27e62b7a2e6587d 100644
--- a/ui/app_list/views/app_list_main_view.cc
+++ b/ui/app_list/views/app_list_main_view.cc
@@ -37,6 +37,8 @@ const int kInnerPadding = 1;
 // The maximum allowed time to wait for icon loading in milliseconds.
 const int kMaxIconLoadingWaitTimeInMs = 50;
 
+const int kContentsViewIndex = 1;
+
 }  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
@@ -106,7 +108,7 @@ AppListMainView::AppListMainView(AppListViewDelegate* delegate,
 void AppListMainView::AddContentsView() {
   contents_view_ = new ContentsView(
       this, pagination_model_, model_, delegate_);
-  AddChildView(contents_view_);
+  AddChildViewAt(contents_view_, kContentsViewIndex);
 
   search_box_view_->set_contents_view(contents_view_);