Initial checkin of gRPC to third_party/

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

Index: third_party/grpc/src/csharp/Grpc.Core/Internal/CallCredentialsSafeHandle.cs
diff --git a/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs b/third_party/grpc/src/csharp/Grpc.Core/Internal/CallCredentialsSafeHandle.cs
similarity index 66%
copy from third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs
copy to third_party/grpc/src/csharp/Grpc.Core/Internal/CallCredentialsSafeHandle.cs
index 9ed7f8c4df4c1ca7b374378c0cf8040e95f22619..0f36337f1132992ae365615ca48799513da9e323 100644
--- a/third_party/protobuf/csharp/src/Google.Protobuf/Reflection/MapFieldAccessor.cs
+++ b/third_party/grpc/src/csharp/Grpc.Core/Internal/CallCredentialsSafeHandle.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/
+#region Copyright notice and license
+// 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
@@ -29,31 +28,33 @@
 // (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
-
 using System;
-using System.Collections;
-using System.Reflection;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
 
-namespace Google.Protobuf.Reflection
+namespace Grpc.Core.Internal
 {
     /// <summary>
-    /// Accessor for map fields.
+    /// grpc_call_credentials from <c>grpc/grpc_security.h</c>
     /// </summary>
-    internal sealed class MapFieldAccessor : FieldAccessorBase
+    internal class CallCredentialsSafeHandle : SafeHandleZeroIsInvalid
     {
-        internal MapFieldAccessor(PropertyInfo property, FieldDescriptor descriptor) : base(property, descriptor)
+        static readonly NativeMethods Native = NativeMethods.Get();
+
+        private CallCredentialsSafeHandle()
         {
         }
 
-        public override void Clear(IMessage message)
+        public static CallCredentialsSafeHandle CreateComposite(CallCredentialsSafeHandle creds1, CallCredentialsSafeHandle creds2)
         {
-            IDictionary list = (IDictionary) GetValue(message);
-            list.Clear();
+            return Native.grpcsharp_composite_call_credentials_create(creds1, creds2);
         }
 
-        public override void SetValue(IMessage message, object value)
+        protected override bool ReleaseHandle()
         {
-            throw new InvalidOperationException("SetValue is not implemented for map fields");
+            Native.grpcsharp_call_credentials_release(handle);
+            return true;
         }
     }
 }