Initial checkin of gRPC to third_party/

third_party/grpc/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs

Index: third_party/grpc/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf.Test/SampleEnum.cs b/third_party/grpc/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs
similarity index 70%
copy from third_party/protobuf/csharp/src/Google.Protobuf.Test/SampleEnum.cs
copy to third_party/grpc/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs
index 77447afa127340046298081d9bfca4dd51c14f6c..4ae57aa773aba8d6623163c48cc549f171316c01 100644
--- a/third_party/protobuf/csharp/src/Google.Protobuf.Test/SampleEnum.cs
+++ b/third_party/grpc/src/csharp/Grpc.Core/Internal/CStringSafeHandle.cs
@@ -1,7 +1,6 @@
 #region Copyright notice and license
-// Protocol Buffers - Google's data interchange format
-// Copyright 2015 Google Inc.  All rights reserved.
-// https://developers.google.com/protocol-buffers/
+// Copyright 2015-2016, Google Inc.
+// All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
@@ -29,14 +28,32 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #endregion
-    
-namespace Google.Protobuf
+using System;
+using System.Runtime.InteropServices;
+using System.Threading.Tasks;
+
+namespace Grpc.Core.Internal
 {
-    // Just a sample enum with positive and negative values to be used in tests.
-    internal enum SampleEnum
+    /// <summary>
+    /// Owned char* object.
+    /// </summary>
+    internal class CStringSafeHandle : SafeHandleZeroIsInvalid
     {
-        NegativeValue = -2,
-        None = 0,
-        PositiveValue = 3
+        static readonly NativeMethods Native = NativeMethods.Get();
+
+        private CStringSafeHandle()
+        {
+        }
+
+        public string GetValue()
+        {
+            return Marshal.PtrToStringAnsi(handle);
+        }
+
+        protected override bool ReleaseHandle()
+        {
+            Native.gprsharp_free(handle);
+            return true;
+        }
     }
 }