[tools] Change map details on clicking a map

Bug: v8:10644
Change-Id: I299e95f5a8505205a4942a5a5b04cde36f1e5320
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2565355Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Sathya Gunasekaran  <gsathya@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71493}

tools/system-analyzer/view/map-panel.mjs

@@ -68,6 +68,7 @@ DOM.defineCustomElement('view/map-panel',
 
   set selectedMapLogEntries(list) {
     this.mapTransitionsPanel.selectedMapLogEntries = list;
+    if (list.length === 1) this.mapDetailsPanel.map = list[0];
   }
   get selectedMapLogEntries() {
     return this.mapTransitionsPanel.selectedMapLogEntries;