Implement 'analysis.occurrences' for the new analysis driver.

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index e1d914d837428c60deb2c29c6adb86a164a0efa3..3d1e63cc4bd6d1b61e6f265537a5dd43ce47660f 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -1851,6 +1851,12 @@ class ServerContextManagerCallbacks extends ContextManagerCallbacks {
           });
         }
         if (analysisServer._hasAnalysisServiceSubscription(
+            AnalysisService.OCCURRENCES, path)) {
+          _runDelayed(() {
+            new_sendDartNotificationOccurrences(analysisServer, result);
+          });
+        }
+        if (analysisServer._hasAnalysisServiceSubscription(
             AnalysisService.OVERRIDES, path)) {
           _runDelayed(() {
             sendAnalysisNotificationOverrides(analysisServer, path, unit);