Reapply "Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors."

tests/lib/mirrors/library_imports_prefixed_show_hide.dart

Index: tests/lib/mirrors/library_imports_prefixed_show_hide.dart
diff --git a/tests/language/check_member_static_test.dart b/tests/lib/mirrors/library_imports_prefixed_show_hide.dart
similarity index 52%
copy from tests/language/check_member_static_test.dart
copy to tests/lib/mirrors/library_imports_prefixed_show_hide.dart
index e66c37da0bfd939d4a2c57a2aa3e80e314249be8..ea7c71fa93ff937f2339f37ec33bb382a22e4af2 100644
--- a/tests/language/check_member_static_test.dart
+++ b/tests/lib/mirrors/library_imports_prefixed_show_hide.dart
@@ -2,20 +2,9 @@
 // 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.
 
-class A {
-  static var a;
-  var b;
-}
+library library_imports_prefixed_show_hide;
 
-class B extends A {
+import 'library_imports_a.dart' as prefixa show somethingFromA;
+import 'library_imports_b.dart' as prefixb hide somethingFromB;
 
-}
-
-class C extends B {
-  var a; /// 01: static type warning
-  static var b; /// 02: compile-time error
-}
-
-void main() {
-  new C();
-}
+var somethingFromPrefixed;