Added Editor stream and sendObjectToEditor RPC into Service Protocol

runtime/observatory/tests/service/send_object_to_editor_rpc_test.dart

+// Copyright (c) 2015, 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 'dart:async';
+
+import 'test_helper.dart';
+
+class _TestClass {
+  _TestClass(this.x, this.y);
+  var x;
+  var y;
+}
+
+var myVar;
+
+eval(Isolate isolate, String expression) async {
+  // Silence analyzer.
+  new _TestClass(null, null);
+  Map params = {
+    'targetId': isolate.rootLibrary.id,
+    'expression': expression,
+  };
+  return await isolate.invokeRpcNoUpgrade('evaluate', params);
+}
+
+var tests = [
+  (Isolate isolate) async {
+    var identifier = 'random string';
+    // One instance of _TestClass retained.
+    var evalResult = await eval(isolate, 'myVar = new _TestClass(null, null)');
+    var params = {
+      'editor': identifier,
+      'objectId': evalResult['class']['id'],
+    };
+
+    var done = new Completer();
+    var stream = await isolate.vm.getEventStream('_Editor');
+
+    stream.listen((ServiceEvent e) {
+      expect(e.kind, equals('_EditorObjectSelected'));
+      expect(e.editor, equals(identifier));
+      expect(e.object, isNotNull);
+      expect(e.object.id, equals(evalResult['class']['id']));
+      done.complete();
+    });
+
+    await isolate.invokeRpcNoUpgrade('_sendObjectToEditor', params);
+
+    await done.future;
+  },
+];
+
+main(args) async => runIsolateTests(args, tests);