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

mojo/public/dart/third_party/barback/test/package_graph/many_parallel_transformers_test.dart

Index: mojo/public/dart/third_party/barback/test/package_graph/many_parallel_transformers_test.dart
diff --git a/mojo/public/dart/third_party/barback/test/package_graph/many_parallel_transformers_test.dart b/mojo/public/dart/third_party/barback/test/package_graph/many_parallel_transformers_test.dart
new file mode 100644
index 0000000000000000000000000000000000000000..8c472418bcad9b627206646d78ba659957c14b72
--- /dev/null
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@@ -0,0 +1,32 @@
+// 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 barback.test.package_graph.transform_test;
+
+import 'package:barback/src/utils.dart';
+import 'package:scheduled_test/scheduled_test.dart';
+
+import '../utils.dart';
+
+main() {
+  initConfig();
+
+  test("handles many parallel transformers", () {
+    currentSchedule.timeout *= 3;
+    var files = new List.generate(100, (i) => "app|$i.txt");
+    var rewrite = new RewriteTransformer("txt", "out");
+    initGraph(files, {"app": [[rewrite]]});
+
+    // Pause and resume apply to simulate parallel long-running transformers.
+    rewrite.pauseApply();
+    updateSources(files);
+    schedule(pumpEventQueue);
+    rewrite.resumeApply();
+
+    for (var i = 0; i < 100; i++) {
+      expectAsset("app|$i.out", "$i.out");
+    }
+    buildShouldSucceed();
+  });
+}