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

mojo/public/dart/third_party/test/lib/src/runner/vm/environment.dart

+// Copyright (c) 2015, 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 test.runner.vm.environment;
+
+import '../environment.dart';
+import '../../util/cancelable_future.dart';
+
+/// The environment for test suites loaded in an isolate in this Dart VM.
+class VMEnvironment implements Environment {
+  const VMEnvironment();
+
+  Uri get observatoryUrl => throw new UnsupportedError(
+      "VMEnvironment.observatoryUrl is not currently supported.");
+
+  Uri get remoteDebuggerUrl => throw new UnsupportedError(
+      "VMEnvironment.observatoryUrl is not supported.");
+
+  CancelableFuture displayPause() =>
+      throw new UnsupportedError(
+          "The VM doesn't yet support Environment.displayPause.");
+}