Better single stepping in VM debugger

runtime/vm/debugger_api_impl.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "include/dart_debugger_api.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_api_state.h"
 #include "vm/debugger.h"
 #include "vm/isolate.h"
@@ skipping 405 matching lines @@
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   isolate->debugger()->SetStepOver();
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetStepInto() {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
-  isolate->debugger()->SetStepInto();
+  isolate->debugger()->SetSingleStep();
   return Api::Success();
 }
 
 
 DART_EXPORT Dart_Handle Dart_SetStepOut() {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   isolate->debugger()->SetStepOut();
   return Api::Success();
 }
@@ skipping 336 matching lines @@
 
 
 DART_EXPORT char* Dart_GetVmStatus(const char* request) {
   if (strncmp(request, "/isolate/", 9) == 0) {
     return Isolate::GetStatus(request);
   }
   return NULL;
 }
 
 }  // namespace dart