Added ability to request zone memory information for all isolates through the VM service and added …

runtime/observatory/tests/service/get_zone_memory_info_rpc_test.dart

Index: runtime/observatory/tests/service/get_zone_memory_info_rpc_test.dart
diff --git a/runtime/observatory/tests/service/get_zone_memory_info_rpc_test.dart b/runtime/observatory/tests/service/get_zone_memory_info_rpc_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..7d5f00452757b0fa556c6cc51ccffae1d2942b4f
--- /dev/null
+++ b/runtime/observatory/tests/service/get_zone_memory_info_rpc_test.dart
@@ -0,0 +1,38 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=--error_on_bad_type --error_on_bad_override
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+
+import 'test_helper.dart';
+
+var tests = [
+  (VM vm) async {
+    isInstanceOf<int> isInt = new isInstanceOf<int>();
+    // Just iterate over all the isolates to confirm they have
+    // the correct fields needed to examine zone memory usage.
+    for (Isolate isolate in vm.isolates) {
+      await isolate.reload();
+
+      expect(isolate.threads, isNotNull);
+      List<Thread> threads = isolate.threads;
+
+      for (Thread thread in threads) {
+        expect(thread.type, equals('_Thread'));
+        expect(thread.id, isNotNull);
+        expect(thread.kind, isNotNull);
+        expect(thread.zones, isNotNull);
+        List<Zone> zones = thread.zones;
+
+        for (Zone zone in zones) {
+          expect(zone.capacity, isInt);
+          expect(zone.used, isInt);
+        }
+      }
+    }
+  },
+];
+
+main(args) async => runVMTests(args, tests);