Add shared tests demonstrating bugs #25624, #25625, and #25626.

tests/language/accessor_conflict_import_prefixed_test.dart

Index: tests/language/accessor_conflict_import_prefixed_test.dart
diff --git a/tests/language/accessor_conflict_import_prefixed_test.dart b/tests/language/accessor_conflict_import_prefixed_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..0c286cb2740db5646cb60705a5925aa9e2c5cc4e
--- /dev/null
+++ b/tests/language/accessor_conflict_import_prefixed_test.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2016, 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.
+
+// Verify that a getter and its corresponding setter can be imported from two
+// different files.  In this test the getter is imported first.
+
+import "package:expect/expect.dart";
+
+import "accessor_conflict_getter.dart" as p;
+import "accessor_conflict_setter.dart" as p;
+
+main() {
+  p.getValue = 123;
+  Expect.equals(p.x, 123);
+  p.x = 456;
+  Expect.equals(p.setValue, 456);
+}