Add dart:developer.postEvent for posting events to the service protocol from Dart code

runtime/vm/bootstrap_natives.h

Index: runtime/vm/bootstrap_natives.h
diff --git a/runtime/vm/bootstrap_natives.h b/runtime/vm/bootstrap_natives.h
index 76413a604add93621d731034f420eec5b39e1148..3d2254f87fd6adf56249d20235d3e5991705604c 100644
--- a/runtime/vm/bootstrap_natives.h
+++ b/runtime/vm/bootstrap_natives.h
@@ -73,6 +73,7 @@ namespace dart {
   V(Developer_lookupExtension, 1)                                              \
   V(Developer_registerExtension, 2)                                            \
   V(Developer_log, 8)                                                          \
+  V(Developer_postEvent, 2)                                                    \
   V(Double_getIsNegative, 1)                                                   \
   V(Double_getIsInfinite, 1)                                                   \
   V(Double_getIsNaN, 1)                                                        \