Issue 351: Reimplement OAuth2 (Step 3 - Tests, Flows and Credential)

Src/GoogleApis/Apis/Util/IClock.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;
 
 namespace Google.Apis.Util
 {
 /// <summary>Clock wrapper for getting the current time.</summary>
 public interface IClock
 {
 /// <summary>
 /// Gets a <seealso cref="DateTime"/> object that is set to the current
date and time on this computer,·
 /// expressed as the local time.
 /// </summary>
 DateTime Now { get; }
+
+/// <summary>
+/// Gets a <seealso cref="DateTime"/> object that is set to the current
date and time on this computer,·
+/// expressed as UTC time.
+/// </summary>
+DateTime UtcNow { get; }
 }
 
 /// <summary>A default clock implementation that wraps the <seealso cref="Da
teTime.Now"/> property.</summary>
 public class SystemClock : IClock
 {
 /// <summary>Constructs a new system clock.</summary>
 protected SystemClock() { }
 
 /// <summary>The default instance.</summary>
 public static readonly IClock Default = new SystemClock();
 
 public DateTime Now
 {
 get { return DateTime.Now; }
 }
+
+public DateTime UtcNow
+{
+get { return DateTime.UtcNow; }
+}
 }
 }