Get some tests running using the analysis driver

pkg/analysis_server/lib/src/analysis_server.dart

Index: pkg/analysis_server/lib/src/analysis_server.dart
diff --git a/pkg/analysis_server/lib/src/analysis_server.dart b/pkg/analysis_server/lib/src/analysis_server.dart
index eec18c3c624199c0db9447271c0468abde78d0f7..a241918b8ad5b184209f1df203fbceb0609ebc4c 100644
--- a/pkg/analysis_server/lib/src/analysis_server.dart
+++ b/pkg/analysis_server/lib/src/analysis_server.dart
@@ -26,6 +26,7 @@ import 'package:analysis_server/src/services/search/search_engine.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal.dart';
 import 'package:analysis_server/src/services/search/search_engine_internal2.dart';
 import 'package:analysis_server/src/single_context_manager.dart';
+import 'package:analysis_server/src/utilities/null_string_sink.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ -371,7 +372,7 @@ class AnalysisServer {
 
     {
       String name = options.newAnalysisDriverLog;
-      StringSink sink = new _NullStringSink();
+      StringSink sink = new NullStringSink();
       if (name != null) {
         if (name == 'stdout') {
           sink = io.stdout;
@@ -2113,10 +2114,3 @@ class ServerPerformanceStatistics {
    */
   static PerformanceTag splitStore = new PerformanceTag('splitStore');
 }
-
-class _NullStringSink implements StringSink {
-  void write(Object obj) {}
-  void writeAll(Iterable objects, [String separator = ""]) {}
-  void writeCharCode(int charCode) {}
-  void writeln([Object obj = ""]) {}
-}