marionette: Add support for WebDriver:Refresh

The `WebDriver:Refresh` command reloads the current page.

src/marionette/message.rs

@@ -155,4 +155,6 @@ pub enum Command {
     FullscreenWindow,
     #[serde(rename = "WebDriver:SetWindowRect")]
     SetWindowRect(WindowRect),
+    #[serde(rename = "WebDriver:Refresh")]
+    Refresh,
 }

src/marionette/mod.rs

@@ -271,6 +271,13 @@ impl Marionette {
         Ok(res.handle)
     }
 
+    pub async fn refresh(&mut self) -> Result<(), CommandError> {
+        let res: serde_json::Value =
+            self.conn.send_message(Command::Refresh).await?.unwrap();
+        debug!("Reeived message: {:?}", res);
+        Ok(())
+    }
+
     pub async fn set_window_rect(
         &mut self,
         x: Option<i32>,