Implement iframe.contentWindow.

src/components/script/dom/htmliframeelement.rs

@@ -14,6 +14,7 @@ use dom::htmlelement::HTMLElement;
 use dom::node::{Node, ElementNodeTypeId, window_from_node};
 use dom::virtualmethods::VirtualMethods;
 use dom::window::Window;
+use script_task::IterablePage;
 use servo_msg::constellation_msg::{PipelineId, SubpageId};
 use servo_msg::constellation_msg::{IFrameSandboxed, IFrameUnsandboxed};
 use servo_msg::constellation_msg::{ConstellationChan, LoadIframeUrlMsg};
@@ -184,7 +185,18 @@ impl<'a> HTMLIFrameElementMethods for JSRef<'a, HTMLIFrameElement> {
     }
 
     fn GetContentWindow(&self) -> Option<Temporary<Window>> {
-        None
+        self.size.and_then(|size| {
+            let window = window_from_node(self).root();
+            let children = &*window.deref().page.children.deref().borrow();
+            let child = children.iter().find(|child| {
+                child.subpage_id.unwrap() == size.subpage_id
+            });
+            child.and_then(|page| {
+                page.frame.deref().borrow().as_ref().map(|frame| {
+                    Temporary::new(frame.window.clone())
+                })
+            })
+        })
     }
 
     fn Align(&self) -> DOMString {

src/components/script/script_task.rs

@@ -173,7 +173,7 @@ pub struct PageIterator {
     stack: Vec<Rc<Page>>,
 }
 
-trait IterablePage {
+pub trait IterablePage {
     fn iter(&self) -> PageIterator;
     fn find(&self, id: PipelineId) -> Option<Rc<Page>>;
 }