Merge the dart:uri library into dart:core and update the Uri class

tests/corelib/uri_normalize_test.dart

+// Copyright (c) 2013, 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.
+
+import "package:expect/expect.dart";
+
+testNormalizePath() {
+  test(String expected, String path) {
+    var uri = new Uri(path: path);
+    Expect.equals(expected, uri.path);
+    Expect.equals(expected, uri.toString());
+  }
+
+  var unreserved = "-._~0123456789"
+                   "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                   "abcdefghijklmnopqrstuvwxyz";
+
+  test("A", "%41");
+  test("AB", "%41%42");
+  test("%40AB", "%40%41%42");
+  test("a", "%61");
+  test("ab", "%61%62");
+  test("%60ab", "%60%61%62");
+  test(unreserved, unreserved);
+
+  var x = new StringBuffer();
+  for (int i = 32; i < 128; i++) {
+    if (unreserved.indexOf(new String.fromCharCode(i)) != -1) {
+      x.writeCharCode(i);
+    } else {
+      x.write("%");
+      x.write(i.toRadixString(16));
+    }
+  }
+  print(x.toString().toUpperCase());
+  Expect.equals(x.toString().toUpperCase(),
+                new Uri(path: x.toString()).toString().toUpperCase());
+}
+
+main() {
+  testNormalizePath();
+}