Canonicalize uris in C++ instead of Dart for the standalone embedder.

tests/corelib/uri_test.dart

 // Copyright (c) 2012, 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 uriTest;
 
 import "package:expect/expect.dart";
 import 'dart:convert';
 
 testUri(String uriText, bool isAbsolute) {
@@ skipping 112 matching lines @@
   testResolve("http://a/b/c/g#s/./x",  "g#s/./x");
   testResolve("http://a/b/c/g#s/../x", "g#s/../x");
   testResolve("http:g",                "http:g");
 
   // Additional tests (not from RFC 3986).
   testResolve("http://a/b/g;p/h;s",    "../g;p/h;s");
 
   // Test non-URI base (no scheme, no authority, relative path).
   base = Uri.parse("a/b/c?_#_");
   testResolve("a/b/g?q#f", "g?q#f");
+  testResolve("./", "../..");
   testResolve("../", "../../..");
   testResolve("a/b/", ".");
   testResolve("c", "../../c");
+  base = Uri.parse("../../a/b/c?_#_");  // Initial ".." in base url.
+  testResolve("../../a/d", "../d");
+  testResolve("../../../d", "../../../d");
 
   base = Uri.parse("s:a/b");
   testResolve("s:/c", "../c");
 }
 
 void testResolvePath(String expected, String path) {
   Expect.equals(expected,
                 new Uri(path: '/').resolveUri(new Uri(path: path)).path);
   Expect.equals(
       "http://localhost$expected",
@@ skipping 483 matching lines @@
 String dump(Uri uri) {
   return "URI: $uri\n"
       "  Scheme:    ${uri.scheme} #${uri.scheme.length}\n"
       "  User-info: ${uri.userInfo} #${uri.userInfo.length}\n"
       "  Host:      ${uri.host} #${uri.host.length}\n"
       "  Port:      ${uri.port}\n"
       "  Path:      ${uri.path} #${uri.path.length}\n"
       "  Query:     ${uri.query} #${uri.query.length}\n"
       "  Fragment:  ${uri.fragment} #${uri.fragment.length}\n";
 }