Support Dart core libraries in source maps.

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

Index: sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_test.dart
diff --git a/sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_test.dart b/sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..bf076c8783230480d8ddeded19a79d1c2757eabb
--- /dev/null
+++ b/sdk/lib/_internal/pub/test/transformer/dart2js/source_maps_include_core_libs_test.dart
@@ -0,0 +1,57 @@
+// 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:scheduled_test/scheduled_test.dart';
+
+import '../../descriptor.dart' as d;
+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", () {
+    d.dir(appPath, [
+      d.appPubspec(),
+      d.dir("web", [
+        d.file("main.dart", "main() => new StringBuffer().writeAll(['s']);"),
+        d.dir("sub", [
+          d.file("main.dart", "main() => new StringBuffer().writeAll(['s']);")
+        ])
+      ])
+    ]).create();
+
+    schedulePub(args: ["build", "--mode", "debug"],
+        output: new RegExp(r'Built \d+ files to "build".'),
+        exitCode: 0);
+
+    d.dir(appPath, [
+      d.dir("build", [
+        d.dir("web", [
+          d.matcherFile("main.dart.js.map",
+              contains(r"packages/$sdk/lib/core/string_buffer.dart")),
+          d.dir("sub", [
+            d.matcherFile("main.dart.js.map",
+                contains(r"../packages/$sdk/lib/core/string_buffer.dart"))
+          ]),
+          d.dir("packages", [
+            d.dir(r"$sdk", [
+              d.dir("lib", [
+                d.dir(r"core", [
+                  d.matcherFile("string_buffer.dart",
+                      contains("class StringBuffer"))
+                ])
+              ])
+            ])
+          ])
+        ])
+      ])
+    ]).validate();
+  });
+}