Add step OverAwait to service protocol

runtime/vm/service.cc

Index: runtime/vm/service.cc
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index c8912eb48c240e41cc2a646e40a21cbc6536d69c..d61a99d07da88d10c48003eb7136fede0407efae 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -2629,7 +2629,7 @@ static bool AddBreakpointAtActivation(Thread* thread, JSONStream* js) {
   }
   const Instance& closure = Instance::Cast(obj);
   Breakpoint* bpt =
-      thread->isolate()->debugger()->SetBreakpointAtActivation(closure);
+      thread->isolate()->debugger()->SetBreakpointAtActivation(closure, false);
   if (bpt == NULL) {
     js->PrintError(kCannotAddBreakpoint,
                    "%s: Cannot add breakpoint at activation",
@@ -3020,6 +3020,12 @@ static bool Resume(Thread* thread, JSONStream* js) {
         isolate->debugger()->SetStepOver();
       } else if (strcmp(step_param, "Out") == 0) {
         isolate->debugger()->SetStepOut();
+      } else if (strcmp(step_param, "OverAwait") == 0) {
+        if (!isolate->debugger()->SetupStepOverAwait()) {
+          js->PrintError(kInvalidParams,
+                         "Isolate must be paused at an await statement.");
+          return true;
+        }
       } else {
         PrintInvalidParamError(js, "step");
         return true;