Add getIsolateID to Service class in dart:developer

runtime/observatory/tests/service/developer_service_get_isolate_id_test.dart

+// 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 'dart:async';
+import 'dart:developer' as dev;
+import 'dart:isolate' as Core;
+
+import 'package:observatory/service_io.dart' as Service;
+import 'package:unittest/unittest.dart';
+import 'service_test_common.dart';
+import 'test_helper.dart';
+
+
+// testee state.
+String selfId;
+Core.Isolate childIsolate;
+String childId;
+
+void spawnEntry(int i) {
+  dev.debugger();
+}
+
+Future testeeMain() async {
+  dev.debugger();
+  // Spawn an isolate.
+  childIsolate = await Core.Isolate.spawn(spawnEntry, 0);
+  // Assign the id for this isolate and it's child to strings so they can
+  // be read by the tester.
+  selfId = dev.Service.getIsolateID(Core.Isolate.current);
+  childId = dev.Service.getIsolateID(childIsolate);
+  dev.debugger();
+}
+
+// tester state:
+Service.Isolate initialIsolate;
+Service.Isolate localChildIsolate;
+
+var tests = [
+  (Service.VM vm) async {
+    // Sanity check.
+    expect(vm.isolates.length, 1);
+    initialIsolate = vm.isolates[0];
+    await hasStoppedAtBreakpoint(initialIsolate);
+    // Resume.
+    await initialIsolate.resume();
+  },
+  (Service.VM vm) async {
+    // Initial isolate has paused at second debugger call.
+    await hasStoppedAtBreakpoint(initialIsolate);
+  },
+  (Service.VM vm) async {
+    // Reload the VM.
+    await vm.reload();
+
+    // Grab the child isolate.
+    localChildIsolate =
+        vm.isolates.firstWhere(
+            (Service.Isolate i) => i != initialIsolate);
+    expect(localChildIsolate, isNotNull);
+
+    // Reload the initial isolate.
+    await initialIsolate.reload();
+
+    // Grab the root library.
+    Service.Library rootLbirary = await initialIsolate.rootLibrary.load();
+
+    // Grab self id.
+    Service.Instance localSelfId =
+        await initialIsolate.eval(rootLbirary, 'selfId');
+
+    // Check that the id reported from dart:developer matches the id reported
+    // from the service protocol.
+    expect(localSelfId.isString, true);
+    expect(initialIsolate.id, equals(localSelfId.valueAsString));
+
+    // Grab the child isolate's id.
+    Service.Instance localChildId =
+        await initialIsolate.eval(rootLbirary, 'childId');
+
+    // Check that the id reported from dart:developer matches the id reported
+    // from the service protocol.
+    expect(localChildId.isString, true);
+    expect(localChildIsolate.id, equals(localChildId.valueAsString));
+  }
+];
+
+main(args) async => runVMTests(args, tests,
+    testeeConcurrent: testeeMain);