Add new VS AddIn examples

visual_studio/NativeClientVSAddIn/NativeClientVSAddIn/PropertyManager.cs

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 namespace NativeClientVSAddIn
 {
   using System;
   using System.Collections.Generic;
   using System.Linq;
   using System.Windows.Forms;
@@ skipping 215 matching lines @@
       {
         AssertNaCl();
         return GetProperty("ConfigurationGeneral", "NaClManifestPath");
       }
 
       protected set
       {
       }
     }
 
+    /// <summary>
+    /// Return true if the given platform is a NaCl platform.
+    /// </summary>
     public static bool IsNaClPlatform(string platformName)
     {
         return platformName.Equals(Strings.NaCl32PlatformName, StringComparison.OrdinalIgnoreCase) ||
                platformName.Equals(Strings.NaCl64PlatformName, StringComparison.OrdinalIgnoreCase);
     }
 
+    /// <summary>
+    /// Return true if the given platform is a PPAPI platform.
+    /// </summary>
     public static bool IsPepperPlatform(string platformName)
     {
         return platformName.Equals(Strings.PepperPlatformName, StringComparison.OrdinalIgnoreCase);
     }
 
     /// <summary>
     /// Sets the target project, platform, and configuration to get settings from.
     /// </summary>
     /// <param name="proj">Project to read settings from.</param>
     /// <param name="targetPlatformName">Platform type to read settings from.</param>
@@ skipping 162 matching lines @@
     private void AssertValidPlatform()
     {
       if (ProjectPlatform == ProjectPlatformType.Other)
       {
         throw new Exception(string.Format(
           "Unsupported platform type: {0} platform", configuration_.Platform.Name));
       }
     }
   }
 }