Use IndexContributor(s) in LocalIndex.

pkg/analysis_server/lib/src/operation/operation_analysis.dart

Index: pkg/analysis_server/lib/src/operation/operation_analysis.dart
diff --git a/pkg/analysis_server/lib/src/operation/operation_analysis.dart b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
index 0270b273feaa026bfc24a120f4c48bc9e7e953cf..c17f399bd20198447817e9b514335cecb85f8194 100644
--- a/pkg/analysis_server/lib/src/operation/operation_analysis.dart
+++ b/pkg/analysis_server/lib/src/operation/operation_analysis.dart
@@ -411,7 +411,7 @@ class _DartIndexOperation extends _SingleFileOperation {
     ServerPerformanceStatistics.indexOperation.makeCurrentWhile(() {
       try {
         Index index = server.index;
-        index.indexUnit(context, unit);
+        index.index(context, unit);
       } catch (exception, stackTrace) {
         server.sendServerErrorNotification(exception, stackTrace);
       }
@@ -469,7 +469,7 @@ class _HtmlIndexOperation extends _SingleFileOperation {
   @override
   void perform(AnalysisServer server) {
     Index index = server.index;
-    index.indexHtmlUnit(context, unit);
+    index.index(context, unit);
   }
 }