Add support to render :once.

This will be used internally by sprockets to ensure requires are executed just once.

1 files changed, 6 insertions, 6 deletions

diff --git a/actionpack/lib/action_view/renderer/abstract_renderer.rb b/actionpack/lib/action_view/renderer/abstract_renderer.rb
index f9fa63ce7f..77cfa51dff 100644
--- a/actionpack/lib/action_view/renderer/abstract_renderer.rb
+++ b/actionpack/lib/action_view/renderer/abstract_renderer.rb
@@ -14,12 +14,6 @@ module ActionView
       raise NotImplementedError
     end
 
-    # Contains the logic that actually renders the layout.
-    def render_layout(layout, locals, &block) #:nodoc:
-      view = @view
-      layout.render(view, locals){ |*name| view._layout_for(*name, &block) }
-    end
-
     # Checks if the given path contains a format and if so, change
     # the lookup context to take this new format into account.
     def wrap_formats(value)
@@ -32,5 +26,11 @@ module ActionView
         yield
       end
     end
+
+    protected
+
+    def instrument(name, options={})
+      ActiveSupport::Notifications.instrument("render_#{name}.action_view", options){ yield }
+    end
   end
 end
\ No newline at end of file