[polymer] Merge of master into polymer10-migration

trace_processor/experimental/mappers/thread_grouping_test.html

Index: trace_processor/experimental/mappers/thread_grouping_test.html
diff --git a/perf_insights/perf_insights/mappers/thread_grouping_test.html b/trace_processor/experimental/mappers/thread_grouping_test.html
similarity index 97%
rename from perf_insights/perf_insights/mappers/thread_grouping_test.html
rename to trace_processor/experimental/mappers/thread_grouping_test.html
index 59b3bedba21a001de74636df2d264ba5bc885ed4..78817e711364c74a8290ffc92164773b2bd0fd49 100644
--- a/perf_insights/perf_insights/mappers/thread_grouping_test.html
+++ b/trace_processor/experimental/mappers/thread_grouping_test.html
@@ -41,10 +41,9 @@ tr.b.unittest.testSuite(function() {
     tg.autoInitUsingHelpers(m);
 
     var allSlices = new tr.model.EventSet();
-    m.iterateAllEvents(function(e) {
+    for (var e of m.getDescendantEvents())
       if (e instanceof tr.model.Slice)
         allSlices.push(e);
-    });
     var groups = tg.divideEventSetIntoSubGroups(allSlices);
     var numGrouped = 0;
     tr.b.iterItems(groups, function(groupName, eventSet) {