Add step OverAwait to service protocol

runtime/vm/service_event.cc

Index: runtime/vm/service_event.cc
diff --git a/runtime/vm/service_event.cc b/runtime/vm/service_event.cc
index 314d6359bb34a145891360397d15b6285c6e52e0..b6acdbb3b2d6151aad9dcc5f5d1eb8ff2255334c 100644
--- a/runtime/vm/service_event.cc
+++ b/runtime/vm/service_event.cc
@@ -225,6 +225,7 @@ void ServiceEvent::PrintJSON(JSONStream* js) const {
   if (async_continuation() != NULL && !async_continuation()->IsNull()) {
     jsobj.AddProperty("_asyncContinuation", *(async_continuation()));
     jsobj.AddProperty("_atAsyncJump", at_async_jump());

[rmacnak, 2016/02/16 21:21:59]

Don't need _atAsyncJump then.

[Cutch, 2016/02/17 18:24:21]

Done.

+    jsobj.AddProperty("atAwait", at_async_jump());

[rmacnak, 2016/02/16 21:21:59]

It's await or yield or yield*.

[Cutch, 2016/02/17 18:24:21]

bit on pause event:
atAsyncContinuation

bit on breakpoint:
isSyntheticAsyncContinuation

step command:
OverAsyncContinuation

   }
   if (inspectee() != NULL) {
     jsobj.AddProperty("inspectee", *(inspectee()));