Ensure traces with bad timers are not taken into accound in the startup report.

perf_insights/perf_insights/mappers/startup_map_function.html

Index: perf_insights/perf_insights/mappers/startup_map_function.html
diff --git a/perf_insights/perf_insights/mappers/startup_map_function.html b/perf_insights/perf_insights/mappers/startup_map_function.html
index 84331d519edef73a6231f01b5a6de7e770ac5d21..6688633ab6c3bfbd02434686e6fed7b16ed5b22e 100644
--- a/perf_insights/perf_insights/mappers/startup_map_function.html
+++ b/perf_insights/perf_insights/mappers/startup_map_function.html
@@ -28,13 +28,17 @@ tr.exportTo('pi.m', function() {
     threadGrouping.autoInitUsingHelpers(model);
     // TODO(beaudoin): Use the Startup IR associated events to filter out what
     // should be included there, once the associated events work correctly.
-    var sliceCosts = pi.m.getSliceCostReport(model, threadGrouping, {},
+    var sliceCosts = pi.m.getSliceCostReport(model, threadGrouping, {}, true,
         function(event) {
           return startupIR.bounds(event);
         });
-    results.addValue(new pi.v.DictValue(runInfo, 'sr',
-        {sliceCosts: sliceCosts,
-         startupDuration: startupIR.duration}));
+    if (sliceCosts.length === 0) {
+      results.addValue(new pi.v.SkipValue(runInfo, 'skipped'));
+    } else {
+      results.addValue(new pi.v.DictValue(runInfo, 'sr',
+          {sliceCosts: sliceCosts,
+           startupDuration: startupIR.duration}));
+    }
   }
 
   pi.MapFunction.register(startupMapFunction);