Use common cookie struct add cookie webdriver cmds

One cookie struct to rule them all. One struct to represent them.
One cookie struct to bind them all, and through the IPC carry them.

components/net/cookie_storage.rs

@@ -6,6 +6,7 @@
 //! http://tools.ietf.org/html/rfc6265
 
 use cookie::Cookie;
+use cookie_rs;
 use net_traits::CookieSource;
 use std::cmp::Ordering;
 use url::Url;
@@ -114,4 +115,12 @@ impl CookieStorage {
             _ => Some(result)
         }
     }
+
+    pub fn cookies_data_for_url<'a>(&'a mut self, url: &'a Url,
+                                    source: CookieSource) -> Box<Iterator<Item=cookie_rs::Cookie> + 'a> {
+        Box::new(self.cookies.iter_mut().filter(move |c| { c.appropriate_for_url(url, source) }).map(|c| {
+            c.touch();
+            c.cookie.clone()
+        }))
+    }
 }