[RPP] Fix a11y focus on tab header on bottom up button click

Bug:392651188
Change-Id: I3b1898ed63174d628bb747ea79ca0560a88e0955
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6215919
Commit-Queue: Jack Franklin <[email protected]>
Reviewed-by: Jack Franklin <[email protected]>
Auto-Submit: Adriana Ixba <[email protected]>

Author: Adriana Ixba

front_end/panels/timeline/TimelineDetailsView.ts

@@ -153,6 +153,10 @@ export class TimelineDetailsView extends
     if (!(this.tabbedPane.visibleView instanceof BottomUpTimelineTreeView)) {
       return;
     }
+    /**
+     * For a11y, ensure that the header is focused.
+     */
+    this.tabbedPane.focusSelectedTabHeader();
     const bottomUp = this.tabbedPane.visibleView;
     const thirdPartyNodeSelected = event.data;
     if (!thirdPartyNodeSelected) {