Emit symbol maps for compiled code for use by the Linux perf tool.

runtime/vm/dart_api_impl.cc

Index: runtime/vm/dart_api_impl.cc
diff --git a/runtime/vm/dart_api_impl.cc b/runtime/vm/dart_api_impl.cc
index 2de0e3732b213aa6d4e0d75ac655a51accd1f7d5..b4cc43491b7eff6c7a218827f38a7cca601e9156 100644
--- a/runtime/vm/dart_api_impl.cc
+++ b/runtime/vm/dart_api_impl.cc
@@ -4151,7 +4151,12 @@ DART_EXPORT void Dart_GetPprofSymbolInfo(void** buffer, int* buffer_size) {
 }
 
 
-DART_EXPORT void Dart_InitFlowGraphPrinting(FileWriterFunction function) {
+DART_EXPORT void Dart_InitPerfEventsSupport(Dart_FileWriterFunction function) {
+  Dart::set_perf_events_writer(function);
+}
+
+
+DART_EXPORT void Dart_InitFlowGraphPrinting(Dart_FileWriterFunction function) {
   Dart::set_flow_graph_writer(function);
 }