webdriver: Raise WebView to top when focus (#38909)

- Add a helper function `focus_and_raise_to_top` to `WebView`.
- For webdriver, raise webview to top when focus, to make it consistent
with user interaction.

Testing: Should reduce some flaky TIMEOUT when combined with another PR
later.
Fixes: A small patch before the PR for #38906.

---------

Signed-off-by: Euclid Ye <euclid.ye@huawei.com>

components/servo/examples/winit_minimal.rs

@@ -58,8 +58,7 @@ impl ::servo::WebViewDelegate for AppState {
             .hidpi_scale_factor(Scale::new(self.window.scale_factor() as f32))
             .delegate(parent_webview.delegate())
             .build();
-        webview.focus();
-        webview.raise_to_top(true);
+        webview.focus_and_raise_to_top(true);
 
         self.webviews.borrow_mut().push(webview.clone());
         Some(webview)
@@ -117,8 +116,7 @@ impl ApplicationHandler<WakerEvent> for App {
                 .delegate(app_state.clone())
                 .build();
 
-            webview.focus();
-            webview.raise_to_top(true);
+            webview.focus_and_raise_to_top(true);
 
             app_state.webviews.borrow_mut().push(webview);
             *self = Self::Running(app_state);

components/servo/webview.rs

@@ -408,6 +408,12 @@ impl WebView {
             .expect("BUG: invalid WebView instance");
     }
 
+    pub fn focus_and_raise_to_top(&self, hide_others: bool) -> FocusId {
+        let focus_id = self.focus();
+        self.raise_to_top(hide_others);
+        focus_id
+    }
+
     pub fn notify_theme_change(&self, theme: Theme) {
         self.inner()
             .constellation_proxy

components/webdriver_server/lib.rs

@@ -2482,7 +2482,7 @@ impl Handler {
         let (sender, receiver) = ipc::channel().unwrap();
         self.send_message_to_embedder(WebDriverCommandMsg::FocusWebView(webview_id, sender))?;
         if wait_for_ipc_response(receiver)? {
-            debug!("Focus new webview successfully");
+            debug!("Focus new webview {webview_id} successfully");
         } else {
             debug!("Focus new webview failed, it may not exist anymore");
         }