Fix bug when packages file changes in new driver

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index 8bbadccbfe05d26f957784f79d4fb3257ccb1f6e..4a281b7cd25b35d8916bf8c963e9434464862318 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -988,14 +988,14 @@ class ContextManagerImpl implements ContextManager {
       String path, ContextInfo info, ChangeType changeType) {
     if (AnalysisEngine.isAnalysisOptionsFileName(path, pathContext)) {
       if (enableNewAnalysisDriver) {
-        // TODO(brianwilkerson) Implement this.
-//        AnalysisDriver driver = info.analysisDriver;
-//        String contextRoot = info.folder.path;
-//        ContextBuilder builder =
-//        callbacks.createContextBuilder(info.folder, defaultContextOptions);
-//        AnalysisOptions options = builder.getAnalysisOptions(contextRoot);
-//        driver.analysisOptions = options;
-//        driver.sourceFactory = builder.createSourceFactory(contextRoot, options);
+        AnalysisDriver driver = info.analysisDriver;
+        String contextRoot = info.folder.path;
+        ContextBuilder builder =
+            callbacks.createContextBuilder(info.folder, defaultContextOptions);
+        AnalysisOptions options = builder.getAnalysisOptions(contextRoot);
+        SourceFactory factory =
+            builder.createSourceFactory(contextRoot, options);
+        driver.configure(analysisOptions: options, sourceFactory: factory);
         // TODO(brianwilkerson) Set exclusion patterns.
       } else {
         var analysisContext = info.context;
@@ -1022,8 +1022,13 @@ class ContextManagerImpl implements ContextManager {
           callbacks.createContextBuilder(info.folder, defaultContextOptions);
       AnalysisOptions options = builder.getAnalysisOptions(contextRoot);
       SourceFactory factory = builder.createSourceFactory(contextRoot, options);
-      info.context.analysisOptions = options;
-      info.context.sourceFactory = factory;
+      if (enableNewAnalysisDriver) {
+        AnalysisDriver driver = info.analysisDriver;
+        driver.configure(analysisOptions: options, sourceFactory: factory);
+      } else {
+        info.context.analysisOptions = options;
+        info.context.sourceFactory = factory;
+      }
     }
   }