Generalize DartSdkManager to support embedder SDKs

pkg/analysis_server/test/domain_analysis_test.dart

Index: pkg/analysis_server/test/domain_analysis_test.dart
diff --git a/pkg/analysis_server/test/domain_analysis_test.dart b/pkg/analysis_server/test/domain_analysis_test.dart
index ad5319e33fac33839cf50e8d445bcafd06196e99..45ca634ee4d932024384b498b3665165d4b3f361 100644
--- a/pkg/analysis_server/test/domain_analysis_test.dart
+++ b/pkg/analysis_server/test/domain_analysis_test.dart
@@ -13,6 +13,7 @@ import 'package:analysis_server/src/domain_analysis.dart';
 import 'package:analysis_server/src/plugin/server_plugin.dart';
 import 'package:analyzer/file_system/memory_file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
+import 'package:analyzer/src/generated/sdk.dart';
 import 'package:path/path.dart';
 import 'package:plugin/manager.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
@@ -47,7 +48,7 @@ main() {
         null,
         serverPlugin,
         new AnalysisServerOptions(),
-        (_) => new MockSdk(),
+        new DartSdkManager('', false, (_) => new MockSdk()),
         InstrumentationService.NULL_SERVICE);
     handler = new AnalysisDomainHandler(server);
   });
@@ -474,7 +475,7 @@ class AnalysisTestHelper {
         null,
         serverPlugin,
         new AnalysisServerOptions(),
-        (_) => new MockSdk(),
+        new DartSdkManager('', false, (_) => new MockSdk()),
         InstrumentationService.NULL_SERVICE);
     handler = new AnalysisDomainHandler(server);
     // listen for notifications