when creating a cef browser, setup the url to load but don't load it

cef apps will expect to enter their main loops before this happens due to
various callbacks being hit, so it's necessary to punt this loading off until
a later time

ports/cef/browser.rs

@@ -264,7 +264,7 @@ pub fn browser_callback_after_created(browser: CefBrowser) {
         life_span_handler.on_after_created(browser.clone());
     }
     browser.downcast().callback_executed.set(true);
-    browser.downcast().host.was_resized();
+    browser.downcast().frame.load();
 }
 
 fn browser_host_create(window_info: &cef_window_info_t,
@@ -274,12 +274,12 @@ fn browser_host_create(window_info: &cef_window_info_t,
                        -> CefBrowser {
     let browser = ServoCefBrowser::new(window_info, client).as_cef_interface();
     browser.init(window_info);
+    if url != ptr::null() {
+       unsafe { browser.downcast().frame.set_url(CefWrap::to_rust(url)); }
+    }
     if callback_executed {
         browser_callback_after_created(browser.clone());
     }
-    if url != ptr::null() {
-       unsafe { browser.downcast().frame.load_url(CefWrap::to_rust(url)); }
-    }
     BROWSERS.with(|browsers| {
         browsers.borrow_mut().push(browser.clone());
     });

ports/cef/frame.rs

@@ -53,10 +53,20 @@ full_cef_class_impl! {
 
 pub trait ServoCefFrameExtensions {
     fn set_browser(&self, browser: CefBrowser);
+    fn set_url(&self, url: &[u16]);
+    fn load(&self);
 }
 
 impl ServoCefFrameExtensions for CefFrame {
     fn set_browser(&self, browser: CefBrowser) {
         *self.downcast().browser.borrow_mut() = Some(browser)
     }
+    fn set_url(&self, url: &[u16]) {
+        let frame = self.downcast();
+        *frame.url.borrow_mut() = String::from_utf16(url).unwrap();
+    }
+    fn load(&self) {
+        let event = WindowEvent::LoadUrl(self.downcast().url.borrow().clone());
+        self.downcast().browser.borrow_mut().as_mut().unwrap().send_window_event(event);
+    }
 }