Issue 24538. Route SDK results into SDK context DartWorkManager.

pkg/analyzer/test/src/context/context_test.dart

Index: pkg/analyzer/test/src/context/context_test.dart
diff --git a/pkg/analyzer/test/src/context/context_test.dart b/pkg/analyzer/test/src/context/context_test.dart
index d4d31319514ec9f35a2c7f811383c3ea1f1cba4c..8875d92b09d0d63f933620b11bac97f93f33b873 100644
--- a/pkg/analyzer/test/src/context/context_test.dart
+++ b/pkg/analyzer/test/src/context/context_test.dart
@@ -1191,6 +1191,33 @@ export 'libA.dart';''');
     fail("The added source was not in the list of library sources");
   }
 
+  void test_getLibrarySources_inSDK() {
+    Source source = addSource(
+        '/test.dart',
+        r'''
+import 'dart:async';
+Stream S = null;
+''');
+    LibraryElement testLibrary = context.computeLibraryElement(source);
+    // prepare "Stream" ClassElement
+    ClassElement streamElement;
+    {
+      CompilationUnitElement testUnit = testLibrary.definingCompilationUnit;
+      InterfaceType streamType = testUnit.topLevelVariables[0].type;
+      streamElement = streamType.element;
+    }
+    // must be from SDK context
+    AnalysisContext sdkContext = context.sourceFactory.dartSdk.context;
+    expect(sdkContext, streamElement.context);
+    // must be in the "async" library
+    Source intSource = streamElement.source;
+    List<Source> coreLibraries = sdkContext.getLibrariesContaining(intSource);
+    expect(coreLibraries, hasLength(1));
+    Source coreSource = coreLibraries[0];
+    expect(coreSource.isInSystemLibrary, isTrue);
+    expect(coreSource.shortName, 'async.dart');
+  }
+
   void test_getLineInfo() {
     Source source = addSource(
         "/test.dart",