Add function parameter info in docgen.

pkg/docgen/test/method_param_test.dart

+// Copyright (c) 2014, 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.
+
+library docgen.test.method_param;
+
+import 'package:path/path.dart' as path;
+import 'package:scheduled_test/scheduled_test.dart';
+
+import 'util.dart';
+import '../lib/docgen.dart' as gen;
+
+void main() {
+  test('method function parameters', () {
+    var lib_file = path.toUri(path.join(getMultiLibraryCodePath(), 'lib',
+        'test_lib2.dart'));
+    return gen.getMirrorSystem([lib_file], false)
+      .then((mirrorSystem) {
+        var library = new gen.Library(mirrorSystem.libraries[lib_file]);
+
+        // Test that libraries do recursive exports correctly.
+        var funcParams = library.functions['fooFunc'].parameters;
+        expect('Symbol("dart.core.int")', library.functions['fooFunc']
+            .parameters['fooFuncParam'].functionDeclaration.parameters['x']
+            .type.mirror.qualifiedName.toString());
+      });
+  });
+}