Generate constants in server as we do in plugin

pkg/analysis_server/lib/src/domain_analytics.dart

Index: pkg/analysis_server/lib/src/domain_analytics.dart
diff --git a/pkg/analysis_server/lib/src/domain_analytics.dart b/pkg/analysis_server/lib/src/domain_analytics.dart
index b2b6706c6d1363889d00dfe2f3aa87671c12f570..f6ad37e675a1cacb879dbc3fab9991728f3f53e7 100644
--- a/pkg/analysis_server/lib/src/domain_analytics.dart
+++ b/pkg/analysis_server/lib/src/domain_analytics.dart
@@ -5,9 +5,9 @@
 import 'dart:core';
 
 import 'package:analysis_server/protocol/protocol.dart';
+import 'package:analysis_server/protocol/protocol_constants.dart';
 import 'package:analysis_server/protocol/protocol_generated.dart';
 import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analysis_server/src/constants.dart';
 
 /// Instances of the class [AnalyticsDomainHandler] implement a [RequestHandler]
 /// that handles requests in the `analytics` domain.
@@ -35,13 +35,13 @@ class AnalyticsDomainHandler implements RequestHandler {
   @override
   Response handleRequest(Request request) {
     String requestName = request.method;
-    if (requestName == ANALYTICS_IS_ENABLED) {
+    if (requestName == ANALYTICS_REQUEST_IS_ENABLED) {
       return handleIsEnabled(request);
-    } else if (requestName == ANALYTICS_ENABLE) {
+    } else if (requestName == ANALYTICS_REQUEST_ENABLE) {
       return handleEnable(request);
-    } else if (requestName == ANALYTICS_SEND_EVENT) {
+    } else if (requestName == ANALYTICS_REQUEST_SEND_EVENT) {
       return handleSendEvent(request);
-    } else if (requestName == ANALYTICS_SEND_TIMING) {
+    } else if (requestName == ANALYTICS_REQUEST_SEND_TIMING) {
       return handleSendTiming(request);
     }