Issue 24538. Route SDK results into SDK context DartWorkManager.

pkg/analyzer/lib/src/task/dart_work_manager.dart

Index: pkg/analyzer/lib/src/task/dart_work_manager.dart
diff --git a/pkg/analyzer/lib/src/task/dart_work_manager.dart b/pkg/analyzer/lib/src/task/dart_work_manager.dart
index 7114053c19154f602d072ceb22e691bc2a3605bb..6f08af207572218dae621f6af1f2bf61e78a48ee 100644
--- a/pkg/analyzer/lib/src/task/dart_work_manager.dart
+++ b/pkg/analyzer/lib/src/task/dart_work_manager.dart
@@ -265,6 +265,19 @@ class DartWorkManager implements WorkManager {
   void resultsComputed(
       AnalysisTarget target, Map<ResultDescriptor, dynamic> outputs) {
     bool isDartSource = _isDartSource(target);
+    // Route SDK outputs to the SDK WorkManager.
+    if (isDartSource && target.source.isInSystemLibrary) {
+      SourceFactory sourceFactory = context.sourceFactory;
+      InternalAnalysisContext sdkContext = sourceFactory.dartSdk.context;
+      if (sdkContext != context) {
+        for (WorkManager sdkWorkManager in sdkContext.workManagers) {
+          if (sdkWorkManager is DartWorkManager) {
+            sdkWorkManager.resultsComputed(target, outputs);
+            return;
+          }
+        }
+      }
+    }
     // Organize sources.
     bool isDartLibrarySource = false;
     if (isDartSource) {