Move a bunch of src/ files into subdirectories.

lib/src/runner/isolate_test.dart

Index: lib/src/runner/isolate_test.dart
diff --git a/lib/src/isolate_test.dart b/lib/src/runner/isolate_test.dart
similarity index 85%
rename from lib/src/isolate_test.dart
rename to lib/src/runner/isolate_test.dart
index 30cbfc36e7236600f453a8eb74b7792616b9fcb4..7914ca75732b42a4fcf7ee656620515be7bed0a5 100644
--- a/lib/src/isolate_test.dart
+++ b/lib/src/runner/isolate_test.dart
@@ -2,16 +2,16 @@
 // 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.
 
-library unittest.isolate_test;
+library unittest.runner.isolate_test;
 
 import 'dart:isolate';
 
-import 'live_test.dart';
-import 'live_test_controller.dart';
-import 'remote_exception.dart';
-import 'state.dart';
-import 'suite.dart';
-import 'test.dart';
+import '../backend/live_test.dart';
+import '../backend/live_test_controller.dart';
+import '../backend/state.dart';
+import '../backend/suite.dart';
+import '../backend/test.dart';
+import '../util/remote_exception.dart';
 
 /// A test in another isolate.
 class IsolateTest implements Test {