Add server-side communications channel

pkg/analyzer_plugin/test/src/channel/isolate_channel_test.dart

 // Copyright (c) 2017, 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.
 
 import 'dart:async';
 import 'dart:isolate';
 
 import 'package:analyzer_plugin/protocol/generated_protocol.dart';
 import 'package:analyzer_plugin/protocol/protocol.dart';
 import 'package:analyzer_plugin/src/channel/isolate_channel.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 void main() {
-  defineReflectiveTests(IsolateChannelTest);
+  defineReflectiveTests(PluginIsolateChannelTest);
 }
 
 @reflectiveTest
-class IsolateChannelTest {
+class PluginIsolateChannelTest {
   TestSendPort sendPort;
-  IsolateChannel channel;
+  PluginIsolateChannel channel;
 
   void setUp() {
     sendPort = new TestSendPort();
-    channel = new IsolateChannel(sendPort);
+    channel = new PluginIsolateChannel(sendPort);
   }
 
   void tearDown() {
     // If the test doesn't listen to the channel, then close will not cancel the
     // subscription and the process will not terminate.
     try {
       channel.listen((request) {});
     } catch (exception) {
       // Ignore the exception if the test has already registered a listener.
     }
@@ skipping 74 matching lines @@
       if (message is SendPort) {
         receivePort = message;
       } else {
         fail('Did not receive a receive port as the first communication.');
       }
     } else {
       sentMessages.add(message);
     }
   }
 }