Wait enough time for tick duration in webdriver dispatch actions (#37423)

Add step `wait at least tick duration milliseconds have passed`
https://w3c.github.io/webdriver/#dfn-dispatch-actions-inner

Testing: Fix intermittent timeout in:

`/tests/wpt/tests/webdriver/tests/classic/perform_actions/pointer_dblclick.py`

cc: @xiaochengh , @jdm

Signed-off-by: batu_hoang <longvatrong111@gmail.com>

components/webdriver_server/actions.rs

@@ -31,6 +31,7 @@ static WHEELSCROLL_INTERVAL: u64 = 17;
 // In the spec, `action item` refers to a plain JSON object.
 // However, we use the name ActionItem here
 // to be consistent with type names from webdriver crate.
+#[derive(Debug)]
 pub(crate) enum ActionItem {
     Null(NullActionItem),
     Key(KeyActionItem),
@@ -148,6 +149,7 @@ impl Handler {
             // Step 1.2. Let tick duration be the result of
             // computing the tick duration with argument tick actions.
             let tick_duration = compute_tick_duration(tick_actions);
+            let now = Instant::now();
 
             // Step 1.3. Try to dispatch tick actions
             self.dispatch_tick_actions(tick_actions, tick_duration)?;
@@ -156,6 +158,12 @@ impl Handler {
             // The user agent event loop has spun enough times to process the DOM events
             // generated by the last invocation of the dispatch tick actions steps.
             self.wait_for_user_agent_handling_complete(tick_actions)?;
+            // At least tick duration milliseconds have passed.
+            let elapsed = now.elapsed();
+            if elapsed.as_millis() < tick_duration as u128 {
+                let sleep_duration = tick_duration - elapsed.as_millis() as u64;
+                thread::sleep(Duration::from_millis(sleep_duration));
+            }
         }
 
         // Step 2. Return success with data null.
@@ -288,6 +296,7 @@ impl Handler {
         Ok(())
     }
 
+    /// <https://w3c.github.io/webdriver/#dfn-dispatch-a-pause-action>
     fn dispatch_general_action(&self, source_id: &str) {
         self.session()
             .unwrap()
@@ -295,8 +304,6 @@ impl Handler {
             .borrow_mut()
             .entry(source_id.to_string())
             .or_insert(InputSourceState::Null);
-        // https://w3c.github.io/webdriver/#dfn-dispatch-a-pause-action
-        // Nothing to be done
     }
 
     /// <https://w3c.github.io/webdriver/#dfn-dispatch-a-keydown-action>