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

mojo/public/dart/third_party/test/lib/src/runner/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.environment;
+
+import '../util/cancelable_future.dart';
+
+/// The abstract class of environments in which test suites are
+/// loaded—specifically, browsers and the Dart VM.
+abstract class Environment {
+  /// The URL of the Dart VM Observatory for this environment, or `null` if this
+  /// environment doesn't run the Dart VM or the URL couldn't be detected.
+  Uri get observatoryUrl;
+
+  /// The URL of the remote debugger for this environment, or `null` if it isn't
+  /// enabled.
+  Uri get remoteDebuggerUrl;
+
+  /// Displays information indicating that the test runner is paused.
+  ///
+  /// The returned future will complete when the user takes action within the
+  /// environment that should unpause the runner. If the runner is unpaused
+  /// elsewhere, the future should be canceled.
+  CancelableFuture displayPause();
+}