Add ability to specify extra insets for a view via its border.

ash/common/system/user/user_view.cc

Index: ash/common/system/user/user_view.cc
diff --git a/ash/common/system/user/user_view.cc b/ash/common/system/user/user_view.cc
index 6dc3605ef973541d0e09cedb46aba578e0c5e532..7c764bbc4c666a397bff9bc5b5f544a4eadba724 100644
--- a/ash/common/system/user/user_view.cc
+++ b/ash/common/system/user/user_view.cc
@@ -573,19 +573,14 @@ void UserView::ToggleAddUserMenuOption() {
     bounds.set_height(row_height * 2);
     add_menu_option_->SetBounds(bounds);
 
-    // This nested container is necessary to stack borders.
-    views::View* nested_container = new views::View();
-    nested_container->SetBorder(
-        views::Border::CreateEmptyBorder(row_height, 0, 0, 0));
-    nested_container->SetLayoutManager(new views::FillLayout());
-    nested_container->AddChildView(button);
-
     views::View* container = new AddUserWidgetContents(
         base::Bind(&UserView::RemoveAddUserMenuOption, base::Unretained(this)));
-    container->SetBorder(views::Border::CreateSolidSidedBorder(
-        0, 0, 0, kSeparatorWidth, kBackgroundColor));
+    container->SetBorder(views::Border::AddInteriorPadding(
+        views::Border::CreateSolidSidedBorder(0, 0, 0, kSeparatorWidth,
+                                              kBackgroundColor),
+        gfx::Insets(row_height, 0, 0, 0)));
     container->SetLayoutManager(new views::FillLayout());
-    container->AddChildView(nested_container);
+    container->AddChildView(button);
     add_menu_option_->SetContentsView(container);
   } else {
     add_menu_option_->SetOpacity(1.f);