Add another URI resolve test

tests/corelib/uri_http_test.dart

Index: tests/corelib/uri_http_test.dart
diff --git a/tests/corelib/uri_http_test.dart b/tests/corelib/uri_http_test.dart
index 95614f7913b3e29afb4d0cd229bd050a4c0ada93..283d995a005822dbbda270ce14c1d74fd61d43b3 100644
--- a/tests/corelib/uri_http_test.dart
+++ b/tests/corelib/uri_http_test.dart
@@ -66,7 +66,17 @@ testHttpsUri() {
   check(new Uri.https("[::127.0.0.1]", "a"), "https://[::127.0.0.1]/a");
 }
 
+testResolveHttpScheme() {
+  String s = "//myserver:1234/path/some/thing";
+  Uri uri = Uri.parse(s);
+  Uri http = new Uri(scheme: "http");
+  Uri https = new Uri(scheme: "https");
+  Expect.equals("http:$s", http.resolveUri(uri).toString());
+  Expect.equals("https:$s", https.resolveUri(uri).toString());
+}
+
 main() {
   testHttpUri();
   testHttpsUri();
+  testResolveHttpScheme();
 }