Add webdriver deletecookies function

components/net/cookie.rs

@@ -143,6 +143,10 @@ impl Cookie {
         self.last_access = now();
     }
 
+    pub fn set_expiry_time_negative(&mut self) {
+        self.expiry_time = Some(Serde(now() - Duration::seconds(1)));
+    }
+
     // http://tools.ietf.org/html/rfc6265#section-5.1.4
     pub fn default_path(request_path: &str) -> &str {
         // Step 2

components/net/cookie_storage.rs

@@ -83,6 +83,13 @@ impl CookieStorage {
             Ok(None)
         }
     }
+    pub fn clear_storage(&mut self, url: &ServoUrl) {
+        let domain = reg_host(url.host_str().unwrap_or(""));
+        let cookies = self.cookies_map.entry(domain).or_insert(vec![]);
+        for cookie in cookies.iter_mut() {
+            cookie.set_expiry_time_negative();
+        }
+    }
 
     // http://tools.ietf.org/html/rfc6265#section-5.3
     pub fn push(&mut self, mut cookie: Cookie, url: &ServoUrl, source: CookieSource) {

components/net/resource_thread.rs

@@ -236,6 +236,14 @@ impl ResourceChannelManager {
                     http_state,
                 ),
             },
+            CoreResourceMsg::DeleteCookies(request) => {
+                http_state
+                    .cookie_jar
+                    .write()
+                    .unwrap()
+                    .clear_storage(&request);
+                return true;
+            },
             CoreResourceMsg::FetchRedirect(req_init, res_init, sender, cancel_chan) => self
                 .resource_manager
                 .fetch(req_init, Some(res_init), sender, http_state, cancel_chan),