Properly split dart:_vmservice across sdk and runtime

runtime/lib/vmservice_patch.dart

Index: runtime/lib/vmservice_patch.dart
diff --git a/runtime/lib/vmservice_patch.dart b/runtime/lib/vmservice_patch.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e9b4da7d53bbfc978994c5feb302f39524e17fa2
--- /dev/null
+++ b/runtime/lib/vmservice_patch.dart
@@ -0,0 +1,12 @@
+// Copyright (c) 2015, 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.
+
+patch bool sendIsolateServiceMessage(SendPort sp, List m)
+    native "VMService_SendIsolateServiceMessage";
+patch void sendRootServiceMessage(List m)
+    native "VMService_SendRootServiceMessage";
+patch void _onStart() native "VMService_OnStart";
+patch void _onExit() native "VMService_OnExit";
+patch bool _vmListenStream(String streamId) native "VMService_ListenStream";
+patch void _vmCancelStream(String streamId) native "VMService_CancelStream";