Make instrumentation data structure more regular

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 0553fbf54d158cd8a11481d633017bbd7a0bbbe7..c99b399af360cdb43f353336e31e56d808bf05e0 100644
--- a/pkg/analyzer/test/instrumentation/instrumentation_test.dart
+++ b/pkg/analyzer/test/instrumentation/instrumentation_test.dart
@@ -128,7 +128,7 @@ class InstrumentationServiceTest {
     String notification = 'notification';
     service.logPluginNotification('path', notification);
     assertNormal(server, InstrumentationService.TAG_PLUGIN_NOTIFICATION,
-        'path:$notification');
+        '$notification:path::');
   }
 
   void test_logPluginRequest() {
@@ -137,7 +137,7 @@ class InstrumentationServiceTest {
     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() {
@@ -146,7 +146,7 @@ class InstrumentationServiceTest {
     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() {