Add stub Vulkan backend

src/utils/VulkanBinding.cpp

@@ -0,0 +1,42 @@
+// Copyright 2017 The NXT Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "utils/BackendBinding.h"
+
+namespace backend {
+    namespace vulkan {
+        void Init(nxtProcTable* procs, nxtDevice* device);
+    }
+}
+
+namespace utils {
+
+    class VulkanBinding : public BackendBinding {
+        public:
+            void SetupGLFWWindowHints() override {
+            }
+            void GetProcAndDevice(nxtProcTable* procs, nxtDevice* device) override {
+                backend::vulkan::Init(procs, device);
+            }
+            uint64_t GetSwapChainImplementation() override {
+                return 0;
+            }
+    };
+
+
+    BackendBinding* CreateVulkanBinding() {
+        return new VulkanBinding;
+    }
+
+}