Add vulkan files into skia repo.

src/gpu/vk/GrVkTexture.h

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef GrVkTexture_DEFINED
+#define GrVkTexture_DEFINED
+
+#include "GrGpu.h"
+#include "GrTexture.h"
+#include "GrVkImage.h"
+
+class GrVkGpu;
+class GrVkImageView;
+
+class GrVkTexture : public GrTexture, public virtual GrVkImage {
+public:
+    static GrVkTexture* CreateNewTexture(GrVkGpu*, const GrSurfaceDesc&,
+                                         GrGpuResource::LifeCycle,
+                                         const GrVkImage::ImageDesc&);
+                                          
+
+    static GrVkTexture* CreateWrappedTexture(GrVkGpu*, const GrSurfaceDesc&,
+                                             GrGpuResource::LifeCycle,
+                                             VkFormat, const GrVkImage::Resource*);
+
+    ~GrVkTexture() override;
+
+    GrBackendObject getTextureHandle() const override;
+
+    void textureParamsModified() override {}
+
+    const GrVkImageView* textureView() const { return fTextureView; }
+
+protected:
+    enum Derived { kDerived };
+
+    GrVkTexture(GrVkGpu*, const GrSurfaceDesc&, GrGpuResource::LifeCycle,
+                const GrVkImage::Resource*, const GrVkImageView* imageView);
+
+    GrVkTexture(GrVkGpu*, const GrSurfaceDesc&, GrGpuResource::LifeCycle,
+                const GrVkImage::Resource*, const GrVkImageView* imageView, Derived);
+
+    static GrVkTexture* Create(GrVkGpu*, const GrSurfaceDesc&,
+                               GrGpuResource::LifeCycle, VkFormat,
+                               const GrVkImage::Resource* texImpl);
+
+    GrVkGpu* getVkGpu() const; 
+
+    void onAbandon() override;
+    void onRelease() override;
+
+private:
+    const GrVkImageView* fTextureView;
+
+    typedef GrTexture INHERITED;
+};
+
+#endif