Support Dart core libraries in source maps.

sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_in_subdirectory_test.dart

Index: sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_in_subdirectory_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_in_subdirectory_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_in_subdirectory_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..d5d02cb89c1dc920be7e712323e018d4f7a0997c
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+++ b/sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_in_subdirectory_test.dart
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+// Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS d.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.
+
+library pub_tests;
+
+import 'package:path/path.dart' as path;
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../../descriptor.dart' as d;
+import '../../serve/utils.dart';
+import '../../test_pub.dart';
+
+main() {
+  initConfig();
+
+  // This test is a bit shaky. Since dart2js is free to inline things, it's
+  // not precise as to which source libraries will actually be referenced in
+  // the source map. But this tries to use a type in the core library
+  // (StringBuffer) and validate that its source ends up in the source map.
+  integration("Dart core libraries are available to source maps when the "
+      "build directory is a subdirectory", () {
+    d.dir(appPath, [
+      d.appPubspec(),
+      d.dir("web", [
+        d.dir("sub", [
+          d.file("main.dart", "main() => new StringBuffer().writeAll(['s']);")
+        ])
+      ])
+    ]).create();
+
+    var webSub = path.join("web", "sub");
+    pubServe(args: [webSub]);
+
+    requestShouldSucceed("main.dart.js.map",
+        contains(r"packages/$sdk/lib/core/string_buffer.dart"),
+        root: webSub);
+    requestShouldSucceed(r"packages/$sdk/lib/core/string_buffer.dart",
+        contains("class StringBuffer"),
+        root: webSub);
+
+    endPubServe();
+  });
+}