Add more compiler timeline durations

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
diff --git a/runtime/vm/flow_graph_type_propagator.cc b/runtime/vm/flow_graph_type_propagator.cc
index 60c20aef02aab97163b42f040aa00daa82cb9f38..fb4d16f226dd3bd75026d2f5136893b5a52967ad 100644
--- a/runtime/vm/flow_graph_type_propagator.cc
+++ b/runtime/vm/flow_graph_type_propagator.cc
@@ -21,6 +21,12 @@ DECLARE_FLAG(bool, fields_may_be_reset);
 
 
 void FlowGraphTypePropagator::Propagate(FlowGraph* flow_graph) {
+  Thread* thread = flow_graph->thread();
+  Isolate* const isolate = flow_graph->isolate();
+  TimelineStream* compiler_timeline = isolate->GetCompilerStream();
+  TimelineDurationScope tds2(thread,
+                             compiler_timeline,
+                             "FlowGraphTypePropagator");
   FlowGraphTypePropagator propagator(flow_graph);
   propagator.Propagate();
 }