[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..8a7d9947ad0a71a0871ea98871f2c237ab767312 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.indexOf(this.selectedNode_) !== -1) {

[hjd, 2016/10/03 09:33:21]

this.$.table.tableRows.includes(this.selectedNode_) might read a tiny bit easier

[petrcermak, 2016/10/03 09:40:25]

Done. I was not aware of that method :-)

+        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_);