Bold names of source Histograms in histogram-set-table.

tracing/tracing/value/ui/histogram_set_table_name_cell.html

Index: tracing/tracing/value/ui/histogram_set_table_name_cell.html
diff --git a/tracing/tracing/value/ui/histogram_set_table_name_cell.html b/tracing/tracing/value/ui/histogram_set_table_name_cell.html
index b860d64799c04d49d981c5efedafbb5073a1725d..289d23e9c8774da265c7a8d30500f15b44a8f41c 100644
--- a/tracing/tracing/value/ui/histogram_set_table_name_cell.html
+++ b/tracing/tracing/value/ui/histogram_set_table_name_cell.html
@@ -197,6 +197,10 @@ tr.exportTo('tr.v.ui', function() {
       }
     },
 
+    set isSource(s) {
+      this.$.name.style.fontWeight = s ? 'bold' : 'normal';
+    },
+
     set constrainWidth(constrain) {
       this.$.name.style.maxWidth = constrain ?
         (this.nameWidthPx + 'px') : 'none';