Add vulkan files into skia repo.

src/gpu/vk/GrVkStencilAttachment.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 GrVkStencil_DEFINED
+#define GrVkStencil_DEFINED
+
+#include "GrStencilAttachment.h"
+#include "GrVkImage.h"
+#include "vulkan/vulkan.h"
+
+class GrVkImageView;
+class GrVkGpu;
+
+class GrVkStencilAttachment : public GrStencilAttachment {
+public:
+    struct Format {
+        VkFormat  fInternalFormat;
+        int  fStencilBits;
+        int  fTotalBits;
+        bool fPacked;
+    };
+
+    static GrVkStencilAttachment* Create(GrVkGpu* gpu, GrGpuResource::LifeCycle lifeCycle,
+                                         int width, int height,
+                                         int sampleCnt, const Format& format);
+
+    ~GrVkStencilAttachment() override;
+
+    const GrVkImage::Resource* imageResource() const { return fImageResource;  }
+    const GrVkImageView* stencilView() const { return fStencilView; }
+
+    VkFormat vkFormat() const { return fFormat.fInternalFormat; }
+
+protected:
+    void onRelease() override;
+    void onAbandon() override;
+
+private:
+    size_t onGpuMemorySize() const override;
+
+    GrVkStencilAttachment(GrVkGpu* gpu,
+                          GrGpuResource::LifeCycle lifeCycle,
+                          const Format& format,
+                          const GrVkImage::ImageDesc&,
+                          const GrVkImage::Resource*,
+                          const GrVkImageView* stencilView);
+
+    GrVkGpu* getVkGpu() const;
+
+    Format fFormat;
+
+    const GrVkImage::Resource* fImageResource;
+    const GrVkImageView*       fStencilView;
+
+    typedef GrStencilAttachment INHERITED;
+};
+
+#endif