From f1d82cf82c9fcbfdf0e40363588fd4ca0f708a3a Mon Sep 17 00:00:00 2001
From: Martin Robinson <mrobinson@igalia.com>
Date: Fri, 14 Nov 2014 10:31:28 -0800
Subject: [PATCH] Add FrameTree::add_child

This helper method simplifies a few lines.
---
 components/compositing/constellation.rs | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/components/compositing/constellation.rs b/components/compositing/constellation.rs
index 0024d516f43..6e2d1380aa9 100644
--- a/components/compositing/constellation.rs
+++ b/components/compositing/constellation.rs
@@ -118,6 +118,10 @@ impl FrameTree {
             has_compositor_layer: Cell::new(false),
         }
     }
+
+    fn add_child(&self, new_child: ChildFrameTree) {
+        self.children.borrow_mut().push(new_child);
+    }
 }
 
 #[deriving(Clone)]
@@ -720,8 +724,7 @@ impl<LTF: LayoutTaskFactory, STF: ScriptTaskFactory> Constellation<LTF, STF> {
                 let new_frame_tree =
                      Rc::new(FrameTree::new(self.get_next_frame_id(), new_pipeline,
                                             Some(frame_tree.pipeline.borrow().clone())));
-                frame_tree.children.borrow_mut().push(ChildFrameTree::new(new_frame_tree,
-                                                                          new_rect));
+                frame_tree.add_child(ChildFrameTree::new(new_frame_tree, new_rect));
             }
         }
     }
@@ -963,8 +966,7 @@ impl<LTF: LayoutTaskFactory, STF: ScriptTaskFactory> Constellation<LTF, STF> {
                             let parent = next_frame_tree.find(parent.id).expect(
                                 "Constellation: pending frame has a parent frame that is not
                                 active. This is a bug.");
-                            parent.children.borrow_mut().push(ChildFrameTree::new(to_add.clone(),
-                                                              rect));
+                            parent.add_child(ChildFrameTree::new(to_add.clone(), rect));
                         }
                     }
                 }