2 files changed, 7 insertions, 0 deletions
diff --git a/src/components/msg/compositor.rs b/src/components/msg/compositor.rs
index 6d8fe2ecc50..d677cdfdaf1 100644
--- a/src/components/msg/compositor.rs
+++ b/src/components/msg/compositor.rs
@@ -8,6 +8,7 @@ use geom::rect::Rect;
 use geom::size::Size2D;
 use std::util::NonCopyable;
 
+#[deriving(Clone)]
 pub struct LayerBuffer {
     draw_target: DrawTarget,
 
@@ -23,6 +24,7 @@ pub struct LayerBuffer {
 
 /// A set of layer buffers. This is an atomic unit used to switch between the front and back
 /// buffers.
+#[deriving(Clone)]
 pub struct LayerBufferSet {
     buffers: ~[LayerBuffer]
 }
diff --git a/src/components/msg/constellation.rs b/src/components/msg/constellation.rs
index b0b97ba528a..aa6442a525d 100644
--- a/src/components/msg/constellation.rs
+++ b/src/components/msg/constellation.rs
@@ -27,8 +27,13 @@ impl ConstellationChan {
 
 pub enum Msg {
     LoadUrlMsg(Url),
+    NavigateMsg(NavigationDirection),
     ExitMsg(Chan<()>),
     RendererReadyMsg(uint),
     TokenSurrenderMsg(~CompositorToken),
 }
 
+pub enum NavigationDirection {
+    Forward,
+    Back,
+}