Move the wire protocol support into the public API

pkg/analysis_server/benchmark/perf/performance_tests.dart

Index: pkg/analysis_server/benchmark/perf/performance_tests.dart
diff --git a/pkg/analysis_server/benchmark/perf/performance_tests.dart b/pkg/analysis_server/benchmark/perf/performance_tests.dart
index 3dd1842c6a9004a3108bea11ad9a0ef39b70400e..761c647972b98969faf9fc7da5db1406e0a8f341 100644
--- a/pkg/analysis_server/benchmark/perf/performance_tests.dart
+++ b/pkg/analysis_server/benchmark/perf/performance_tests.dart
@@ -6,7 +6,7 @@ library server.performance;
 
 import 'dart:async';
 
-import 'package:analysis_server/src/protocol.dart';
+import 'package:analysis_server/plugin/protocol/protocol.dart';
 import 'package:unittest/unittest.dart';
 
 import '../../test/integration/integration_tests.dart';
@@ -29,16 +29,6 @@ abstract class AbstractAnalysisServerPerformanceTest
       sendAnalysisSetAnalysisRoots([sourceDirectory.path], []);
 
   /**
-   * Enable [SERVER_STATUS] notifications so that [analysisFinished]
-   * can be used.
-   */
-  Future subscribeToStatusNotifications() {
-    List<Future> futures = <Future>[];
-    futures.add(sendServerSetSubscriptions([ServerService.STATUS]));
-    return Future.wait(futures);
-  }
-
-  /**
    * The server is automatically started before every test.
    */
   @override
@@ -65,6 +55,16 @@ abstract class AbstractAnalysisServerPerformanceTest
   }
 
   /**
+   * Enable [SERVER_STATUS] notifications so that [analysisFinished]
+   * can be used.
+   */
+  Future subscribeToStatusNotifications() {
+    List<Future> futures = <Future>[];
+    futures.add(sendServerSetSubscriptions([ServerService.STATUS]));
+    return Future.wait(futures);
+  }
+
+  /**
    * After every test, the server is stopped.
    */
   @override