Make instrumentation data structure more regular

pkg/analyzer/test/instrumentation/instrumentation_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.
 
 library analyzer.test.instrumentation.instrumentation_test;
 
 import 'dart:async';
 
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:test/test.dart';
@@ skipping 110 matching lines @@
     assertNormal(server, InstrumentationService.TAG_PLUGIN_EXCEPTION,
         '$message:$stackTraceText:path:name:version');
   }
 
   void test_logPluginNotification() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
     String notification = 'notification';
     service.logPluginNotification('path', notification);
     assertNormal(server, InstrumentationService.TAG_PLUGIN_NOTIFICATION,
-        'path:$notification');
+        '$notification:path::');
   }
 
   void test_logPluginRequest() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
     String request = 'request';
     service.logPluginRequest('path', request);
     assertNormal(
-        server, InstrumentationService.TAG_PLUGIN_REQUEST, 'path:$request');
+        server, InstrumentationService.TAG_PLUGIN_REQUEST, '$request:path::');
   }
 
   void test_logPluginResponse() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
     String response = 'response';
     service.logPluginResponse('path', response);
     assertNormal(
-        server, InstrumentationService.TAG_PLUGIN_RESPONSE, 'path:$response');
+        server, InstrumentationService.TAG_PLUGIN_RESPONSE, '$response:path::');
   }
 
   void test_logPluginTimeout() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
     PluginData plugin = new PluginData('path', 'name', 'version');
     String request = 'request';
     service.logPluginTimeout(plugin, request);
     assertNormal(server, InstrumentationService.TAG_PLUGIN_TIMEOUT,
         '$request:path:name:version');
@@ skipping 87 matching lines @@
   @override
   void logWithPriority(String message) {
     priorityChannel.writeln(message);
   }
 
   @override
   Future shutdown() async {
     // Ignored
   }
 }