Stop running pub get at gclient sync time and fix build bugs

mojo/public/dart/third_party/path/lib/src/style/url.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.
+
+library path.style.url;
+
+import '../characters.dart' as chars;
+import '../internal_style.dart';
+
+/// The style for URL paths.
+class UrlStyle extends InternalStyle {
+  UrlStyle();
+
+  final name = 'url';
+  final separator = '/';
+  final separators = const ['/'];
+
+  // Deprecated properties.
+
+  final separatorPattern = new RegExp(r'/');
+  final needsSeparatorPattern =
+      new RegExp(r"(^[a-zA-Z][-+.a-zA-Z\d]*://|[^/])$");
+  final rootPattern = new RegExp(r"[a-zA-Z][-+.a-zA-Z\d]*://[^/]*");
+  final relativeRootPattern = new RegExp(r"^/");
+
+  bool containsSeparator(String path) => path.contains('/');
+
+  bool isSeparator(int codeUnit) => codeUnit == chars.SLASH;
+
+  bool needsSeparator(String path) {
+    if (path.isEmpty) return false;
+
+    // A URL that doesn't end in "/" always needs a separator.
+    if (!isSeparator(path.codeUnitAt(path.length - 1))) return true;
+
+    // A URI that's just "scheme://" needs an extra separator, despite ending
+    // with "/".
+    return path.endsWith("://") && rootLength(path) == path.length;
+  }
+
+  int rootLength(String path) {
+    if (path.isEmpty) return 0;
+    if (isSeparator(path.codeUnitAt(0))) return 1;
+    var index = path.indexOf("/");
+    if (index > 0 && path.startsWith('://', index - 1)) {
+      // The root part is up until the next '/', or the full path. Skip
+      // '://' and search for '/' after that.
+      index = path.indexOf('/', index + 2);
+      if (index > 0) return index;
+      return path.length;
+    }
+    return 0;
+  }
+
+  bool isRootRelative(String path) =>
+      path.isNotEmpty && isSeparator(path.codeUnitAt(0));
+
+  String getRelativeRoot(String path) => isRootRelative(path) ? '/' : null;
+
+  String pathFromUri(Uri uri) => uri.toString();
+
+  Uri relativePathToUri(String path) => Uri.parse(path);
+  Uri absolutePathToUri(String path) => Uri.parse(path);
+}