Allow stepping when paused at isolate start.

runtime/vm/service.cc

 // Copyright (c) 2013, 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 "vm/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 2290 matching lines @@
 
 static const MethodParameter* resume_params[] = {
   ISOLATE_PARAMETER,
   NULL,
 };
 
 
 static bool Resume(Isolate* isolate, JSONStream* js) {
   const char* step_param = js->LookupParam("step");
   if (isolate->message_handler()->paused_on_start()) {
+    // If the user is issuing a 'Over' or an 'Out' step, that is the
+    // same as a regular resume request.
+    if ((step_param != NULL) && (strcmp(step_param, "Into") == 0)) {
+      isolate->debugger()->EnterSingleStepMode();
+    }
     isolate->message_handler()->set_pause_on_start(false);
     if (Service::debug_stream.enabled()) {
       ServiceEvent event(isolate, ServiceEvent::kResume);
       Service::HandleEvent(&event);
     }
     PrintSuccess(js);
     return true;
   }
   if (isolate->message_handler()->paused_on_exit()) {
     isolate->message_handler()->set_pause_on_exit(false);
@@ skipping 813 matching lines @@
     ServiceMethodDescriptor& method = service_methods_[i];
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 
 }  // namespace dart