Fix bad space handling in Uris.

tests/compiler/dart2js/space_test.dart

Index: tests/compiler/dart2js/space_test.dart
diff --git a/tests/compiler/dart2js/space_test.dart b/tests/compiler/dart2js/space_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..6eeafcd94a21d77d569985d8d528b77e9073d30b
--- /dev/null
+++ b/tests/compiler/dart2js/space_test.dart
@@ -0,0 +1,18 @@
+// Copyright (c) 2014, 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 'dart:io';
+import '../../../sdk/lib/_internal/compiler/implementation/dart2js.dart'
+  as dart2js;
+
+main() {
+  Uri currentDirectory = Uri.base;
+  Uri script = currentDirectory.resolveUri(Platform.script);
+  Uri libraryRoot = script.resolve('../../../sdk/');
+  Directory.current = script.resolve("path with spaces").toFilePath();
+
+  return dart2js.main(["--library-root=${libraryRoot.toFilePath()}",
+                       "--analyze-only",
+                       "file with spaces.dart"]);
+}