Add appengine/gcloud/mustache dependencies.

pkg/appengine/lib/api/remote_api.dart

+// 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.
+
+library appengine.api.remote_api;
+
+import 'dart:async';
+import 'dart:io';
+
+@deprecated
+abstract class RemoteApi {
+  // TODO: We might want to change this to (maybe with more information about
+  // request):
+  // Future<List<int>> handleRemoteApiRequest(List<int> data);
+
+  /**
+   * Handles the RemoteApi [request].
+   *
+   * The user is responsible for ensuring that [request] is either a GET or a
+   * POST request. If an error occurs during the processing of [request] the
+   * returned future will complete with an error.
+   */
+  Future handleRemoteApiRequest(HttpRequest request);
+}