Allow for embedder provided service request handlers

runtime/vm/service.h

Index: runtime/vm/service.h
diff --git a/runtime/vm/service.h b/runtime/vm/service.h
index 8806b46822b87033a1c51013040d3f1c5099a6b0..c6c52b43ee282a49dddc049f09d16558b08fa549 100644
--- a/runtime/vm/service.h
+++ b/runtime/vm/service.h
@@ -11,8 +11,10 @@
 
 namespace dart {
 
+class EmbedderServiceHandler;
 class Instance;
 class Isolate;
+class JSONStream;
 class RawInstance;
 
 class Service : public AllStatic {
@@ -26,8 +28,17 @@ class Service : public AllStatic {
   static Isolate* GetServiceIsolate(void* callback_data);
   static bool SendIsolateStartupMessage();
   static bool SendIsolateShutdownMessage();
- private:
   static bool IsRunning();
+
+  static void RegisterEmbedderCallback(const char* name,
+                                       Dart_ServiceRequestCallback callback,
+                                       void* user_data);
+
+ private:
+  static void EmbedderHandleIsolateMessage(EmbedderServiceHandler* handler,
+                                           JSONStream* js);
+  static EmbedderServiceHandler* FindEmbedderHandler(const char* name);
+  static EmbedderServiceHandler* service_handler_head_;
   static Isolate* service_isolate_;
   static Dart_LibraryTagHandler default_handler_;
   static Dart_Port port_;