Restore "Add current rss and embedder name to Observatory"

runtime/vm/service.h

Index: runtime/vm/service.h
diff --git a/runtime/vm/service.h b/runtime/vm/service.h
index 0d9aa39e5a6024ac589b071bf4769a018ac053d9..b6704cbe31a184f858c2ed682efc49ebc4c0d040 100644
--- a/runtime/vm/service.h
+++ b/runtime/vm/service.h
@@ -25,6 +25,7 @@ class GrowableObjectArray;
 class Instance;
 class Isolate;
 class JSONStream;
+class JSONObject;
 class Object;
 class RawInstance;
 class RawError;
@@ -100,6 +101,9 @@ class Service : public AllStatic {
                                            Dart_ServiceRequestCallback callback,
                                            void* user_data);
 
+  static void SetEmbedderInformationCallback(
+      Dart_EmbedderInformationCallback callback);
+
   static void SetEmbedderStreamCallbacks(
       Dart_ServiceStreamListenCallback listen_callback,
       Dart_ServiceStreamCancelCallback cancel_callback);
@@ -163,10 +167,14 @@ class Service : public AllStatic {
     return stream_cancel_callback_;
   }
 
+  static void PrintJSONForEmbedderInformation(JSONObject *jsobj);
   static void PrintJSONForVM(JSONStream* js, bool ref);
 
   static void CheckForPause(Isolate* isolate, JSONStream* stream);
 
+  static int64_t CurrentRSS();
+  static int64_t MaxRSS();
+
  private:
   static RawError* InvokeMethod(Isolate* isolate,
                                 const Array& message,
@@ -209,6 +217,7 @@ class Service : public AllStatic {
   static Dart_ServiceStreamListenCallback stream_listen_callback_;
   static Dart_ServiceStreamCancelCallback stream_cancel_callback_;
   static Dart_GetVMServiceAssetsArchive get_service_assets_callback_;
+  static Dart_EmbedderInformationCallback embedder_information_callback_;
 
   static bool needs_isolate_events_;
   static bool needs_debug_events_;