Add vulkan files into skia repo.

src/gpu/vk/GrVkSampler.h

+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef GrVkSampler_DEFINED
+#define GrVkSampler_DEFINED
+
+#include "GrVkResource.h"
+
+#include "vulkan/vulkan.h"
+
+class GrTextureAccess;
+class GrVkGpu;
+
+
+class GrVkSampler : public GrVkResource {
+public:
+    static GrVkSampler* Create(const GrVkGpu* gpu, const GrTextureAccess& textureAccess);
+
+    VkSampler sampler() const { return fSampler; }
+
+private:
+    GrVkSampler(VkSampler sampler) : INHERITED(), fSampler(sampler) {}
+
+    void freeGPUData(const GrVkGpu* gpu) const override;
+
+    VkSampler  fSampler;
+
+    typedef GrVkResource INHERITED;
+};
+
+#endif