Propagate privacy information of iframes to corresponding pipelines. Make iframes of differing privacy values be considered cross-origin.

Make the constellation hand out separate private and public channels for the pipeline content to communicate with the resource thread as necessary.

components/script/dom/htmliframeelement.rs

@@ -562,6 +562,21 @@ impl HTMLIFrameElementMethods for HTMLIFrameElement {
     make_getter!(Height, "height");
     // https://html.spec.whatwg.org/multipage/#dom-dim-height
     make_dimension_setter!(SetHeight, "height");
+
+    // check-tidy: no specs after this line
+    fn SetMozprivatebrowsing(&self, value: bool) {
+        let element = self.upcast::<Element>();
+        element.set_bool_attribute(&Atom::from("mozprivatebrowsing"), value);
+    }
+
+    fn Mozprivatebrowsing(&self) -> bool {
+        if window_from_node(self).is_mozbrowser() {
+            let element = self.upcast::<Element>();
+            element.has_attribute(&Atom::from("mozprivatebrowsing"))
+        } else {
+            false
+        }
+    }
 }
 
 impl VirtualMethods for HTMLIFrameElement {

components/script/dom/webidls/HTMLIFrameElement.webidl

@@ -33,6 +33,9 @@ partial interface HTMLIFrameElement {
 partial interface HTMLIFrameElement {
     [Func="::dom::window::Window::global_is_mozbrowser"]
     attribute boolean mozbrowser;
+
+    [Func="::dom::window::Window::global_is_mozbrowser"]
+    attribute boolean mozprivatebrowsing;
 };
 
 HTMLIFrameElement implements BrowserElement;

components/script/dom/websocket.rs

@@ -489,8 +489,8 @@ impl Runnable for ConnectionEstablishedTask {
             for cookie in cookies.iter() {
                 if let Ok(cookie_value) = String::from_utf8(cookie.clone()) {
                     let _ = ws.global().r().core_resource_thread().send(SetCookiesForUrl(ws.url.clone(),
-                                                                                    cookie_value,
-                                                                                    HTTP));
+                                                                                         cookie_value,
+                                                                                         HTTP));
                 }
             }
         }