Add Environment.TickCount64 (#120)

nanoFramework.Runtime.Native/Properties/AssemblyInfo.cs

@@ -12,7 +12,7 @@
 
 ////////////////////////////////////////////////////////////////
 // update this whenever the native assembly signature changes //
-[assembly: AssemblyNativeVersion("100.0.8.0")]
+[assembly: AssemblyNativeVersion("100.0.9.0")]
 ////////////////////////////////////////////////////////////////
 
 // Setting ComVisible to false makes the types in this assembly not visible 

nanoFramework.Runtime.Native/System/Environment.cs

@@ -0,0 +1,25 @@
+//
+// Copyright (c) .NET Foundation and Contributors
+// See LICENSE file in the project root for full license information.
+//
+
+using System.Runtime.CompilerServices;
+
+namespace System
+{
+    /// <summary>
+    /// Provides information about, and means to manipulate, the current environment and platform. This class cannot be inherited.
+    /// </summary>
+    public static partial class Environment
+    {
+        /// <summary>
+        /// Gets the number of milliseconds elapsed since the system started.
+        /// </summary>
+        /// <value>The elapsed milliseconds since the system started.</value>
+        public static extern long TickCount64
+        {
+            [MethodImpl(MethodImplOptions.InternalCall)]
+            get;
+        }
+    }
+}

nanoFramework.Runtime.Native/nanoFramework.Runtime.Native.nfproj

@@ -46,6 +46,7 @@
     <Compile Include="ExecutionConstraint.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Rtc.cs" />
+    <Compile Include="System\Environment.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="key.snk" />

version.json

@@ -1,6 +1,6 @@
 {
   "$schema": "https://raw.githubusercontent.com/dotnet/Nerdbank.GitVersioning/master/src/NerdBank.GitVersioning/version.schema.json",
-  "version": "1.5.3-preview.{height}",
+  "version": "1.5.4-preview.{height}",
   "assemblyVersion": {
     "precision": "revision"
   },