pkg/docgen: moved model classes into minilibs

pkg/docgen/lib/src/exports/source_mirrors.dart

Index: pkg/docgen/lib/src/exports/source_mirrors.dart
diff --git a/pkg/polymer/example/canonicalization/test/canonicalization3_test.dart b/pkg/docgen/lib/src/exports/source_mirrors.dart
similarity index 57%
copy from pkg/polymer/example/canonicalization/test/canonicalization3_test.dart
copy to pkg/docgen/lib/src/exports/source_mirrors.dart
index 962c3d8af6b141f812be0d45b808d3b5f7ff393d..7c2ee9cc53dc07727dda14d474d9098efb72ce52 100644
--- a/pkg/polymer/example/canonicalization/test/canonicalization3_test.dart
+++ b/pkg/docgen/lib/src/exports/source_mirrors.dart
@@ -2,9 +2,7 @@
 // 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 canonicalization.test.canonizalization3_test;
+library docgen.exports.source_mirrors;
 
-import 'package:polymer/polymer.dart';
-import 'common.dart';
-
-@initMethod main() => tests();
+export '../../../../../sdk/lib/_internal/compiler/implementation/mirrors/source_mirrors.dart'
+    hide SourceLocation;