Make it possible to share the embedder's dart sources for the vmservice

runtime/vm/service_isolate.h

Index: runtime/vm/service_isolate.h
diff --git a/runtime/vm/service_isolate.h b/runtime/vm/service_isolate.h
index a942ec153e7148ebff0426cb73218c004389ded2..1b1a9f66bac753c708f3811e2e11ad115bc78c71 100644
--- a/runtime/vm/service_isolate.h
+++ b/runtime/vm/service_isolate.h
@@ -34,6 +34,13 @@ class ServiceIsolate : public AllStatic {
 
   static void BootVmServiceLibrary();
 
+  static void SetServerAddress(const char* address);
+
+  // Returns the server's web address or NULL if none is running.
+  static const char* server_address() {
+    return server_address_;
+  }
+
  private:
   static void KillServiceIsolate();
 
@@ -59,6 +66,7 @@ class ServiceIsolate : public AllStatic {
   static Dart_Port port_;
   static Dart_Port load_port_;
   static Dart_Port origin_;
+  static char* server_address_;
 
   friend class Dart;
   friend class RunServiceTask;