Restore "Add current rss and embedder name to Observatory"

runtime/observatory/tests/observatory_ui/mocks/objects/vm.dart

Index: runtime/observatory/tests/observatory_ui/mocks/objects/vm.dart
diff --git a/runtime/observatory/tests/observatory_ui/mocks/objects/vm.dart b/runtime/observatory/tests/observatory_ui/mocks/objects/vm.dart
index 77fb1535a5b91d063747912b2a056114e13001bf..c19ba5658c05e337e5aa6085e4bf35a11c3afc83 100644
--- a/runtime/observatory/tests/observatory_ui/mocks/objects/vm.dart
+++ b/runtime/observatory/tests/observatory_ui/mocks/objects/vm.dart
@@ -17,8 +17,10 @@ class VMMock implements M.VM {
   final String targetCPU;
   final String hostCPU;
   final String version;
+  final String embedder;
   final int pid;
   final int maxRSS;
+  final int currentRSS;
   final DateTime startTime;
   final Iterable<M.IsolateRef> isolates;
   final int nativeZoneMemoryUsage = 0;
@@ -40,8 +42,10 @@ class VMMock implements M.VM {
       this.targetCPU,
       this.hostCPU,
       this.version,
+      this.embedder,
       this.pid: 0,
       this.maxRSS: 0,
+      this.currentRSS: 0,
       this.startTime,
       this.isolates: const []});
 }