Basic dart^2 analyzer tests running.

pkg/analyzer_experimental/lib/src/analyzer_impl.dart

Index: pkg/analyzer_experimental/lib/src/analyzer_impl.dart
diff --git a/pkg/analyzer_experimental/lib/src/analyzer_impl.dart b/pkg/analyzer_experimental/lib/src/analyzer_impl.dart
index 84cfb8dc34358ccf1bcb0337924237e0366f8f43..4e46d616ba3a5f2e084884816446b771b23ad8ba 100644
--- a/pkg/analyzer_experimental/lib/src/analyzer_impl.dart
+++ b/pkg/analyzer_experimental/lib/src/analyzer_impl.dart
@@ -17,10 +17,12 @@ import 'generated/ast.dart';
 import 'generated/element.dart';
 import '../options.dart';
 
+
+DartSdk sdk;
+
 /// Analyzes single library [File].
 class AnalyzerImpl {
   final CommandLineOptions options;
-  DartSdk sdk;
 
   ContentCache contentCache = new ContentCache();
   SourceFactory sourceFactory;
@@ -33,7 +35,9 @@ class AnalyzerImpl {
   final List<AnalysisErrorInfo> errorInfos = new List<AnalysisErrorInfo>();
 
   AnalyzerImpl(CommandLineOptions this.options) {
-    sdk = new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
+    if (sdk == null) {
+      sdk = new DirectoryBasedDartSdk(new JavaFile(options.dartSdkPath));
+    }
   }
 
   /**