Extract common code, add host IP to --debug and --enable-vm-service options

dart/runtime/bin/vmservice_impl.h

Index: dart/runtime/bin/vmservice_impl.h
diff --git a/dart/runtime/bin/vmservice_impl.h b/dart/runtime/bin/vmservice_impl.h
index 8ca7233eda91e55e0e2fe785f27f844e40e93929..b49809edb602679aa3675a2302a8e9e358769c05 100644
--- a/dart/runtime/bin/vmservice_impl.h
+++ b/dart/runtime/bin/vmservice_impl.h
@@ -15,12 +15,12 @@ namespace bin {
 class VmService {
  public:
   // Returns false if service could not be started.
-  static bool Start(intptr_t server_port);
+  static bool Start(const char *server_ip, intptr_t server_port);
   // Error message if startup failed.
   static const char* GetErrorMessage();
 
  private:
-  static bool _Start(intptr_t server_port);
+  static bool _Start(const char *server_ip, intptr_t server_port);
   static Dart_Handle GetSource(const char* name);
   static Dart_Handle LoadScript(const char* name);
   static Dart_Handle LoadSource(Dart_Handle library, const char* name);