Add current rss and embedder name to Observatory

runtime/vm/service.cc

Index: runtime/vm/service.cc
diff --git a/runtime/vm/service.cc b/runtime/vm/service.cc
index b47a133c76ae4f299214cd2ed228162fadc8393f..066354f0d59c8066470953dd4e2642609acece5f 100644
--- a/runtime/vm/service.cc
+++ b/runtime/vm/service.cc
@@ -109,6 +109,7 @@ const ServiceMethodDescriptor* FindMethod(const char* method_name);
 Dart_ServiceStreamListenCallback Service::stream_listen_callback_ = NULL;
 Dart_ServiceStreamCancelCallback Service::stream_cancel_callback_ = NULL;
 Dart_GetVMServiceAssetsArchive Service::get_service_assets_callback_ = NULL;
+Dart_EmbedderInformationCallback Service::embedder_information_callback_ = NULL;
 
 // These are the set of streams known to the core VM.
 StreamInfo Service::vm_stream("VM");
@@ -1227,6 +1228,41 @@ void Service::SetGetServiceAssetsCallback(
   get_service_assets_callback_ = get_service_assets;
 }
 
+void Service::SetEmbedderInformationCallback(
+    Dart_EmbedderInformationCallback callback) {
+  embedder_information_callback_ = callback;
+}
+
+int64_t Service::CurrentRSS() {
+  if (embedder_information_callback_ == NULL) {
+    return -1;
+  }
+  Dart_EmbedderInformation info = {
+    0,  // version
+    NULL,  // name
+    0,  // max_rss
+    0  // current_rss
+  };
+  embedder_information_callback_(&info);
+  ASSERT(info.version == DART_EMBEDDER_INFORMATION_CURRENT_VERSION);
+  return info.current_rss;
+}
+
+int64_t Service::MaxRSS() {
+  if (embedder_information_callback_ == NULL) {
+    return -1;
+  }
+  Dart_EmbedderInformation info = {
+    0,  // version
+    NULL,  // name
+    0,  // max_rss
+    0  // current_rss
+  };
+  embedder_information_callback_(&info);
+  ASSERT(info.version == DART_EMBEDDER_INFORMATION_CURRENT_VERSION);
+  return info.max_rss;
+}
+
 EmbedderServiceHandler* Service::FindRootEmbedderHandler(const char* name) {
   EmbedderServiceHandler* current = root_service_handler_head_;
   while (current != NULL) {
@@ -3821,6 +3857,28 @@ static const MethodParameter* get_vm_params[] = {
     NO_ISOLATE_PARAMETER, NULL,
 };
 
+void Service::PrintJSONForEmbedderInformation(JSONObject *jsobj) {
+  if (embedder_information_callback_ != NULL) {
+    Dart_EmbedderInformation info = {
+      0,  // version
+      NULL,  // name
+      0,  // max_rss
+      0  // current_rss
+    };
+    embedder_information_callback_(&info);
+    ASSERT(info.version == DART_EMBEDDER_INFORMATION_CURRENT_VERSION);
+    if (info.name != NULL) {
+      jsobj->AddProperty("_embedder", info.name);
+    }
+    if (info.max_rss > 0) {
+      jsobj->AddProperty64("_maxRSS", info.max_rss);
+    }
+    if (info.max_rss > 0) {
+      jsobj->AddProperty64("_currentRSS", info.current_rss);
+    }
+  }
+}
+
 void Service::PrintJSONForVM(JSONStream* js, bool ref) {
   JSONObject jsobj(js);
   jsobj.AddProperty("type", (ref ? "@VM" : "VM"));
@@ -3836,10 +3894,10 @@ void Service::PrintJSONForVM(JSONStream* js, bool ref) {
   jsobj.AddProperty64("_nativeZoneMemoryUsage",
                       ApiNativeScope::current_memory_usage());
   jsobj.AddProperty64("pid", OS::ProcessId());
-  jsobj.AddProperty64("_maxRSS", OS::MaxRSS());
   jsobj.AddPropertyTimeMillis(
       "startTime", OS::GetCurrentTimeMillis() - Dart::UptimeMillis());
   MallocHooks::PrintToJSONObject(&jsobj);
+  PrintJSONForEmbedderInformation(&jsobj);
   // Construct the isolate list.
   {
     JSONArray jsarr(&jsobj, "isolates");