Switch AnalysisDriver tests to using the physical SDK.

pkg/analyzer/test/src/dart/analysis/physical_sdk.dart

Index: pkg/analyzer/test/src/dart/analysis/physical_sdk.dart
diff --git a/pkg/analyzer/test/src/dart/analysis/physical_sdk.dart b/pkg/analyzer/test/src/dart/analysis/physical_sdk.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6677d8a35a740c62db76e661e4d23698ade1fd73
--- /dev/null
+++ b/pkg/analyzer/test/src/dart/analysis/physical_sdk.dart
@@ -0,0 +1,11 @@
+// Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:analyzer/file_system/physical_file_system.dart';
+import 'package:analyzer/src/dart/sdk/sdk.dart';
+import 'package:analyzer/src/generated/sdk.dart';
+
+final DartSdk sdk = new FolderBasedDartSdk(PhysicalResourceProvider.INSTANCE,
+    FolderBasedDartSdk.defaultSdkDirectory(PhysicalResourceProvider.INSTANCE))
+  ..useSummary = true;