Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Runtime.Caching/System/Caching/Hosting/IApplicationIdentifier.cs

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+// <copyright file="IApplicationIdentifier.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+
+namespace System.Runtime.Caching.Hosting {
+    public interface IApplicationIdentifier {
+        String GetApplicationId();
+    }
+}

mcs/class/referencesource/System.Runtime.Caching/System/Caching/Hosting/IFileChangeNotificationSystem.cs

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+// <copyright file="IFileChangeNotificationSystem.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+
+namespace System.Runtime.Caching.Hosting {
+    public interface IFileChangeNotificationSystem {
+        void StartMonitoring(string filePath, OnChangedCallback onChangedCallback, out Object state, out DateTimeOffset lastWriteTime, out long fileSize);
+
+        void StopMonitoring(string filePath, Object state);
+    }
+}

mcs/class/referencesource/System.Runtime.Caching/System/Caching/Hosting/IMemoryCacheManager.cs

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+// <copyright file="IMemoryCacheManager.cs" company="Microsoft">
+//   Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
+// </copyright>
+using System;
+
+namespace System.Runtime.Caching.Hosting {
+    public interface IMemoryCacheManager {
+        void UpdateCacheSize(long size, MemoryCache cache);
+        void ReleaseCache(MemoryCache cache);
+    }
+}