[tracing] Navigate to parent node in heap dump UI upon pressing backspace

tracing/tracing/ui/analysis/memory_dump_heap_details_path_view.html

Index: tracing/tracing/ui/analysis/memory_dump_heap_details_path_view.html
diff --git a/tracing/tracing/ui/analysis/memory_dump_heap_details_path_view.html b/tracing/tracing/ui/analysis/memory_dump_heap_details_path_view.html
index 17ff9be0b876528af1f1b854098089444ad9fc82..de5e473049bee94c0b13fed59ebb7dff312abefd 100644
--- a/tracing/tracing/ui/analysis/memory_dump_heap_details_path_view.html
+++ b/tracing/tracing/ui/analysis/memory_dump_heap_details_path_view.html
@@ -105,6 +105,11 @@ tr.exportTo('tr.ui.analysis', function() {
         return;
       }
 
+      if (this.$.table.tableRows.includes(this.selectedNode_)) {
+        this.$.table.selectedTableRow = this.selectedNode_;
+        return;
+      }
+
       this.$.table.selectionMode = tr.ui.b.TableFormat.SelectionMode.ROW;
       this.$.table.userCanModifySortOrder = false;
       var rows = this.createRows_(this.selectedNode_);