Add support for built-in plugins

pkg/analyzer/test/instrumentation/instrumentation_test.dart

Index: pkg/analyzer/test/instrumentation/instrumentation_test.dart
diff --git a/pkg/analyzer/test/instrumentation/instrumentation_test.dart b/pkg/analyzer/test/instrumentation/instrumentation_test.dart
index 67bb03dc94fbfe87f7fba20cc2c2fcdf39c42141..0553fbf54d158cd8a11481d633017bbd7a0bbbe7 100644
--- a/pkg/analyzer/test/instrumentation/instrumentation_test.dart
+++ b/pkg/analyzer/test/instrumentation/instrumentation_test.dart
@@ -125,9 +125,8 @@ class InstrumentationServiceTest {
   void test_logPluginNotification() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
-    Uri uri = new Uri.file('path');
     String notification = 'notification';
-    service.logPluginNotification(uri, notification);
+    service.logPluginNotification('path', notification);
     assertNormal(server, InstrumentationService.TAG_PLUGIN_NOTIFICATION,
         'path:$notification');
   }
@@ -135,9 +134,8 @@ class InstrumentationServiceTest {
   void test_logPluginRequest() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
-    Uri uri = new Uri.file('path');
     String request = 'request';
-    service.logPluginRequest(uri, request);
+    service.logPluginRequest('path', request);
     assertNormal(
         server, InstrumentationService.TAG_PLUGIN_REQUEST, 'path:$request');
   }
@@ -145,9 +143,8 @@ class InstrumentationServiceTest {
   void test_logPluginResponse() {
     TestInstrumentationServer server = new TestInstrumentationServer();
     InstrumentationService service = new InstrumentationService(server);
-    Uri uri = new Uri.file('path');
     String response = 'response';
-    service.logPluginResponse(uri, response);
+    service.logPluginResponse('path', response);
     assertNormal(
         server, InstrumentationService.TAG_PLUGIN_RESPONSE, 'path:$response');
   }