Restore "Add current rss and embedder name to Observatory"

runtime/observatory/tests/service/vm_test.dart

Index: runtime/observatory/tests/service/vm_test.dart
diff --git a/runtime/observatory/tests/service/vm_test.dart b/runtime/observatory/tests/service/vm_test.dart
index f39465e0a2ba661389b72512be3df7cdc46471e4..0f3c7d342f7f33c735ceef6220f9cd9748014ddc 100644
--- a/runtime/observatory/tests/service/vm_test.dart
+++ b/runtime/observatory/tests/service/vm_test.dart
@@ -12,6 +12,11 @@ var tests = [
     VM vm = isolate.owner;
     expect(vm.targetCPU, isNotNull);
     expect(vm.architectureBits == 32 || vm.architectureBits == 64, isTrue);
+    expect(vm.embedder, equals("Dart VM"));
+    expect(vm.currentRSS, isNotNull);
+    expect(vm.currentRSS, greaterThan(0));
+    expect(vm.maxRSS, isNotNull);
+    expect(vm.maxRSS, greaterThan(0));
   },
 ];