Reimplement OAuth2 library - Step 1

Src/GoogleApis/Apis/Http/IHttpExecuteInterceptor.cs

 /*
 Copyright 2013 Google Inc
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Net.Http;
-using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
 
 namespace Google.Apis.Http
 {
 /// <summary>
- /// Http request execute interceptor to intercept a <see cref="System.Net.Ht
 tp.HttpRequestMessage"/> before it has
+ /// HTTP request execute interceptor to intercept a <see cref="System.Net.Ht
 tp.HttpRequestMessage"/> before it has
 /// been sent. Sample usage is attaching "Authorization" header to a request
.
 /// </summary>
 public interface IHttpExecuteInterceptor
 {
- /// <summary> Invoked before the request is being sent. </summary>
- void Intercept(HttpRequestMessage request);
+ /// <summary>
+ /// <summary>Invoked before the request is being sent.</summary>
+ /// </summary>
+ /// <param name="request">The HTTP request message</param>
+ /// <param name="cancellationToken">Cancellation token to cancel the ope
 ration</param>
+ Task InterceptAsync(HttpRequestMessage request, CancellationToken cancel
 lationToken);
 }
 }