Generalize DartSdkManager to support embedder SDKs

pkg/analysis_server/test/single_context_manager_test.dart

Index: pkg/analysis_server/test/single_context_manager_test.dart
diff --git a/pkg/analysis_server/test/single_context_manager_test.dart b/pkg/analysis_server/test/single_context_manager_test.dart
index 25ab3bd9efc1184e296d67e399c967f7f5d98321..d85214a9a326d9f356f60f544b47836972511e83 100644
--- a/pkg/analysis_server/test/single_context_manager_test.dart
+++ b/pkg/analysis_server/test/single_context_manager_test.dart
@@ -65,9 +65,8 @@ class SingleContextManagerTest {
     packageResolver = new TestUriResolver();
 
     _processRequiredPlugins();
-    DartSdkManager sdkManager = new DartSdkManager((_) {
-      return new MockSdk();
-    });
+    DartSdkManager sdkManager =
+        new DartSdkManager('', false, (_) => new MockSdk());
     manager = new SingleContextManager(resourceProvider, sdkManager,
         (_) => packageResolver, analysisFilesGlobs, new AnalysisOptionsImpl());
     callbacks = new TestContextManagerCallbacks(resourceProvider);